ArduinoJson | πŸ“Ÿ JSON library for Arduino and embedded C++

Β by Β  bblanchon C++ Version: v6.21.0 License: MIT

kandi X-RAY | ArduinoJson Summary

ArduinoJson is a C++ library typically used in Internet of Things (IoT), Arduino applications. ArduinoJson has no bugs, it has no vulnerabilities, it has a Permissive License and it has medium support. You can download it from GitHub.
ArduinoJson is a C++ JSON library for Arduino and IoT (Internet Of Things).
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                        ArduinoJson has a medium active ecosystem.
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                        It has 6075 star(s) with 1066 fork(s). There are 194 watchers for this library.
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                        There were 3 major release(s) in the last 6 months.
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                        There are 24 open issues and 1772 have been closed. On average issues are closed in 47 days. There are no pull requests.
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                        It has a neutral sentiment in the developer community.
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                        The latest version of ArduinoJson is v6.21.0
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                                    ArduinoJson has 0 bugs and 0 code smells.
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                                                ArduinoJson has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.
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                                                            ArduinoJson is licensed under the MIT License. This license is Permissive.
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                                                                        Installation instructions are not available. Examples and code snippets are available.
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                                                                                  ArduinoJson Key Features

                                                                                  JSON deserialization Optionally decodes UTF-16 escape sequences to UTF-8 Optionally stores links to the input buffer (zero-copy) Optionally supports comments in the input Optionally filters the input to keep only desired values Supports single quotes as a string delimiter Compatible with NDJSON and JSON Lines
                                                                                  JSON serialization Can write to a buffer or a stream Optionally indents the document (prettified JSON)
                                                                                  MessagePack serialization
                                                                                  MessagePack deserialization
                                                                                  Efficient Twice smaller than the "official" Arduino_JSON library Almost 10% faster than the "official" Arduino_JSON library Consumes roughly 10% less RAM than the "official" Arduino_JSON library Fixed memory allocation, no heap fragmentation Optionally works without heap memory (zero malloc) Deduplicates strings
                                                                                  Versatile Supports custom allocators (to use external RAM chip, for example) Supports String, std::string, and std::string_view Supports Stream and std::istream/std::ostream Supports Flash strings Supports custom readers and custom writers Supports custom converters
                                                                                  Portable Usable on any C++ project (not limited to Arduino) Compatible with C++98, C++11, C++14 and C++17 Zero warnings with -Wall -Wextra -pedantic and /W4 Header-only library Works with virtually any board Arduino boards: Uno, Due, Micro, Nano, Mega, Yun, Leonardo... Espressif chips: ESP8266, ESP32 Lolin (WeMos) boards: D1 mini, D1 Mini Pro... Teensy boards: 4.0, 3.2, 2.0 Particle boards: Argon, Boron, Electron, Photon... Texas Instruments boards: MSP430... Soft cores: Nios II... Tested on all major development environments Arduino IDE Atmel Studio Atollic TrueSTUDIO Energia IAR Embedded Workbench Keil uVision MPLAB X IDE Particle PlatformIO Sloeber plugin for Eclipse Visual Micro Visual Studio Even works with online compilers like wandbox.org CMake friendly
                                                                                  Well designed Elegant API Thread-safe Self-contained (no external dependency) const friendly for friendly TMP friendly Handles integer overflows
                                                                                  Well tested Unit test coverage close to 100% Continuously tested on Visual Studio 2010, 2012, 2013, 2015, 2017, 2019, 2022 GCC 4.4, 4.6, 4.7, 4.8, 4.9, 5, 6, 7, 8, 9, 10, 11 Clang 3.5, 3.6, 3.7, 3.8, 3.9, 4.0, 5.0, 6.0, 7, 8, 9, 10 Continuously fuzzed with Google OSS Fuzz Passes all default checks of clang-tidy
                                                                                  Well documented Tutorials Examples How-tos FAQ Troubleshooter Book Changelog
                                                                                  Vibrant user community Most popular of all Arduino libraries on GitHub Used in hundreds of projects Responsive support Discord server

                                                                                  ArduinoJson Examples and Code Snippets

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                                                                                  Community Discussions

                                                                                  Trending Discussions on ArduinoJson

                                                                                  Thinger.IO client setup for GPRS enabled ESP32 project
                                                                                  chevron right
                                                                                  Getting json keys from an array from an object using ArduinoJson
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                                                                                  QUESTION

                                                                                  Thinger.IO client setup for GPRS enabled ESP32 project
                                                                                  Asked 2022-Apr-02 at 21:33

                                                                                  I've been using the Thinger.io platform for some of my IoT projects (mostly ESP8266 modules) for quite a long time now. The way I implemented it is something similar to that:

                                                                                  #include 
                                                                                  #include 
                                                                                  
                                                                                  #define USERNAME "username"
                                                                                  #define DEVICE_ID "deviceid"
                                                                                  #define DEVICE_CREDENTIAL "devicecredential"
                                                                                  
                                                                                  ThingerESP8266 thing(USERNAME, DEVICE_ID, DEVICE_CREDENTIAL);
                                                                                  
                                                                                  void connectToWifi() {
                                                                                    ...
                                                                                  }
                                                                                  
                                                                                  void setup() {
                                                                                    connectToWifi();
                                                                                  }
                                                                                  
                                                                                  void loop() {
                                                                                    thing.handle();
                                                                                  }
                                                                                  

                                                                                  and it just works. It is good to also mention that I've been using WiFi all the way.

                                                                                  Now I am trying to achieve the same by taking advantage of a controller called TTGO T-Call ESP32. It is GPRS enabled (using the TinyGsmClient.h) and I have inserted a SIM card inside of it which successfully connects to the internet. The issue is that I can not really establish a connection to the Thinger.io platform where my devices are hosted. This is what my code looks like (making a reference to this library example)

                                                                                      // Your GPRS credentials (leave empty, if not needed)
                                                                                  const char apn[]      = ""; // APN (example: internet.vodafone.pt) use https://wiki.apnchanger.org
                                                                                  const char gprsUser[] = ""; // GPRS User
                                                                                  const char gprsPass[] = ""; // GPRS Password
                                                                                  
                                                                                  // SIM card PIN (leave empty, if not defined)
                                                                                  const char simPIN[]   = ""; 
                                                                                  
                                                                                  // TTGO T-Call pins
                                                                                  #define MODEM_RST            5
                                                                                  #define MODEM_PWKEY          4
                                                                                  #define MODEM_POWER_ON       23
                                                                                  #define MODEM_TX             27
                                                                                  #define MODEM_RX             26
                                                                                  #define I2C_SDA              21
                                                                                  #define I2C_SCL              22
                                                                                  
                                                                                  // Set serial for debug console (to Serial Monitor, default speed 115200)
                                                                                  #define SerialMon Serial
                                                                                  // Set serial for AT commands (to SIM800 module)
                                                                                  #define SerialAT Serial1
                                                                                  
                                                                                  // Configure TinyGSM library
                                                                                  #define TINY_GSM_MODEM_SIM800      // Modem is SIM800
                                                                                  #define TINY_GSM_RX_BUFFER   1024  // Set RX buffer to 1Kb
                                                                                  
                                                                                  // Define the serial console for debug prints, if needed
                                                                                  //#define DUMP_AT_COMMANDS
                                                                                  
                                                                                  #include 
                                                                                  #include 
                                                                                  
                                                                                  #ifdef DUMP_AT_COMMANDS
                                                                                    #include 
                                                                                    StreamDebugger debugger(SerialAT, SerialMon);
                                                                                    TinyGsm modem(debugger);
                                                                                  #else
                                                                                    TinyGsm modem(SerialAT);
                                                                                  #endif
                                                                                  
                                                                                  // I2C for SIM800 (to keep it running when powered from battery)
                                                                                  TwoWire I2CPower = TwoWire(0);
                                                                                  
                                                                                  // TinyGSM Client for Internet connection
                                                                                  TinyGsmClient client(modem);
                                                                                  
                                                                                  #define uS_TO_S_FACTOR 1000000UL   /* Conversion factor for micro seconds to seconds */
                                                                                  #define TIME_TO_SLEEP  3600        /* Time ESP32 will go to sleep (in seconds) 3600 seconds = 1 hour */
                                                                                  
                                                                                  #define IP5306_ADDR          0x75
                                                                                  #define IP5306_REG_SYS_CTL0  0x00
                                                                                  
                                                                                  bool setPowerBoostKeepOn(int en){
                                                                                    I2CPower.beginTransmission(IP5306_ADDR);
                                                                                    I2CPower.write(IP5306_REG_SYS_CTL0);
                                                                                    if (en) {
                                                                                      I2CPower.write(0x37); // Set bit1: 1 enable 0 disable boost keep on
                                                                                    } else {
                                                                                      I2CPower.write(0x35); // 0x37 is default reg value
                                                                                    }
                                                                                    return I2CPower.endTransmission() == 0;
                                                                                  }
                                                                                  
                                                                                  void connectToApn(){
                                                                                    SerialMon.println("Connecting to: internet.vivacom.bg ... ");
                                                                                  
                                                                                    while(!modem.gprsConnect(apn, gprsUser, gprsPass))
                                                                                      delay(500);
                                                                                    
                                                                                    SerialMon.println("Successfully connected to: internet.vivacom.bg");
                                                                                  }
                                                                                  
                                                                                  // #include  => ArduinoJson.h: No such file or directory
                                                                                  // #include  => ESP8266WiFi.h : No such file or directory
                                                                                  #define USERNAME ""
                                                                                  #define DEVICE_ID ""
                                                                                  #define DEVICE_CREDENTIAL ""
                                                                                  
                                                                                  #include 
                                                                                  ThingerESP32 thing(USERNAME, DEVICE_ID, DEVICE_CREDENTIAL);
                                                                                  //#include "arduino_secrets.h"
                                                                                  
                                                                                  
                                                                                  
                                                                                  // Server details
                                                                                  const char server[]   = "vsh.pp.ua";
                                                                                  const char resource[] = "/TinyGSM/logo.txt";
                                                                                  const int  port       = 80;
                                                                                  
                                                                                  #include 
                                                                                  HttpClient http(client, server, port);
                                                                                  
                                                                                  
                                                                                  
                                                                                  void setup() {
                                                                                    // Set serial monitor debugging window baud rate to 115200
                                                                                    SerialMon.begin(115200);
                                                                                  
                                                                                    // Start I2C communication
                                                                                    I2CPower.begin(I2C_SDA, I2C_SCL, 400000);
                                                                                  
                                                                                    // Keep power when running from battery
                                                                                    bool isOk = setPowerBoostKeepOn(1);
                                                                                    SerialMon.println(String("IP5306 KeepOn ") + (isOk ? "OK" : "FAIL"));
                                                                                  
                                                                                    // Set modem reset, enable, power pins
                                                                                    pinMode(MODEM_PWKEY, OUTPUT);
                                                                                    pinMode(MODEM_RST, OUTPUT);
                                                                                    pinMode(MODEM_POWER_ON, OUTPUT);
                                                                                    digitalWrite(MODEM_PWKEY, LOW);
                                                                                    digitalWrite(MODEM_RST, HIGH);
                                                                                    digitalWrite(MODEM_POWER_ON, HIGH);
                                                                                  
                                                                                    // Set GSM module baud rate and UART pins
                                                                                    SerialAT.begin(115200, SERIAL_8N1, MODEM_RX, MODEM_TX);
                                                                                    delay(3000);
                                                                                  
                                                                                    // Restart SIM800 module, it takes quite some time
                                                                                    // To skip it, call init() instead of restart()
                                                                                    SerialMon.println("Initializing modem...");
                                                                                    modem.restart();
                                                                                  
                                                                                    // Unlock your SIM card with a PIN if needed
                                                                                    if (strlen(simPIN) && modem.getSimStatus() != 3 ) {
                                                                                      modem.simUnlock(simPIN);
                                                                                    }
                                                                                  
                                                                                    // Configure the wake up source as timer wake up  
                                                                                    esp_sleep_enable_timer_wakeup(TIME_TO_SLEEP * uS_TO_S_FACTOR);
                                                                                  
                                                                                    // Connect to APN
                                                                                    connectToApn();
                                                                                  }
                                                                                  
                                                                                  void loop() { 
                                                                                    thing.handle();
                                                                                    
                                                                                    SerialMon.println("In the loop ...");
                                                                                    delay(3000);
                                                                                  
                                                                                    SerialMon.print(F("Performing HTTP GET request... "));
                                                                                    int err = http.get(resource);
                                                                                    if (err != 0) {
                                                                                      SerialMon.println(F("failed to connect"));
                                                                                      delay(10000);
                                                                                      return;
                                                                                    }
                                                                                  
                                                                                    int status = http.responseStatusCode();
                                                                                    SerialMon.print(F("Response status code: "));
                                                                                    SerialMon.println(status);
                                                                                    if (!status) {
                                                                                      delay(10000);
                                                                                      return;
                                                                                    }
                                                                                  
                                                                                    SerialMon.println(F("Response Headers:"));
                                                                                    while (http.headerAvailable()) {
                                                                                      String headerName  = http.readHeaderName();
                                                                                      String headerValue = http.readHeaderValue();
                                                                                      SerialMon.println("    " + headerName + " : " + headerValue);
                                                                                    }
                                                                                  
                                                                                    int length = http.contentLength();
                                                                                    if (length >= 0) {
                                                                                      SerialMon.print(F("Content length is: "));
                                                                                      SerialMon.println(length);
                                                                                    }
                                                                                    if (http.isResponseChunked()) {
                                                                                      SerialMon.println(F("The response is chunked"));
                                                                                    }
                                                                                  
                                                                                    String body = http.responseBody();
                                                                                    SerialMon.println(F("Response:"));
                                                                                    SerialMon.println(body);
                                                                                  
                                                                                    SerialMon.print(F("Body length is: "));
                                                                                    SerialMon.println(body.length());
                                                                                    // Put ESP32 into deep sleep mode (with timer wake up)
                                                                                    // esp_deep_sleep_start();
                                                                                  }
                                                                                  

                                                                                  NOTE: The board I've picked from the Arduino IDE is called ESP32 Wrover Module

                                                                                  ANSWER

                                                                                  Answered 2022-Mar-27 at 14:01

                                                                                  It would be better if you ask this question on the thinger community, the thinger.io https://community.thinger.io/ where the thinger devs or community will be listening.

                                                                                  I have some working code, see below, this works with SIM7000E, but it should work OK with SIM800 the code should work the same. I have noticed that you are not using the thinger library (ThingerTinyGSM.h) and this is probably why the device isn't connecting to thinger.

                                                                                  #define THINGER_SERIAL_DEBUG //This will provide debug messages of what thinger 
                                                                                  code is trying to do
                                                                                  #define _DISABLE_TLS_ //TLS needs to be disabled if using ESP32 (not sure why, this is a known bug)
                                                                                  
                                                                                  // Select your modem:
                                                                                  //#define TINY_GSM_MODEM_SIM800 //Note SimCom docs state that SIM7000e used same commands as SIM800
                                                                                  #define TINY_GSM_MODEM_SIM7000 //Note SimCom docs state that SIM7000e used same commands as SIM800
                                                                                  
                                                                                  #define APN_NAME "..."
                                                                                  #define APN_USER "..."
                                                                                  #define APN_PSWD "..."
                                                                                  
                                                                                  //Pins for connecting to SIM module using 2nd Serial connection
                                                                                  #define RXD1 16 
                                                                                  #define TXD1 17
                                                                                  
                                                                                  #include 
                                                                                  #include 
                                                                                  
                                                                                  //Thinger credentials
                                                                                  #define USERNAME "...."    //Thinger Account User Name
                                                                                  #define DEVICE_ID "...."    //Thinger device IC
                                                                                  #define DEVICE_CREDENTIAL "...." //Thinger device credential (password)
                                                                                  ThingerTinyGSM thing(USERNAME, DEVICE_ID, DEVICE_CREDENTIAL, Serial2);
                                                                                  
                                                                                  /*******************************
                                                                                  ****  SET-UP  ****  SET-UP  ****
                                                                                  ********************************/
                                                                                  void setup() {
                                                                                    // open serial for debugging
                                                                                    Serial.begin(115200);
                                                                                    Serial2.begin(115200, SERIAL_8N1, RXD1, TXD1);
                                                                                    
                                                                                    delay(1000);
                                                                                    Serial.println(); Serial.println();
                                                                                    Serial.println("Starting Thinger GSM Test");
                                                                                    delay(1000);
                                                                                  
                                                                                    // set APN, you can remove user and password from call if your apn does not require them
                                                                                    thing.setAPN(APN_NAME, APN_USER, APN_PSWD);
                                                                                  
                                                                                    ////// Thinger resource output example (i.e. reading a sensor value)
                                                                                    thing["Status"] >> [](pson & out) {
                                                                                      out["Timer(ms)"] = millis();
                                                                                      out["device"] = String(DEVICE_ID); 
                                                                                    };
                                                                                  }
                                                                                  
                                                                                  void loop() { 
                                                                                    thing.handle();
                                                                                  }
                                                                                  

                                                                                  Source https://stackoverflow.com/questions/71542363

                                                                                  QUESTION

                                                                                  Getting json keys from an array from an object using ArduinoJson
                                                                                  Asked 2022-Feb-07 at 19:12

                                                                                  I'm having trouble getting the keys (and values) from "prefs" in the following json.

                                                                                  {
                                                                                    "cmd": "set",
                                                                                    "prefs": [
                                                                                      {
                                                                                        "coins": 4
                                                                                      },
                                                                                      {
                                                                                        "enable": true
                                                                                      }
                                                                                    ]
                                                                                  }
                                                                                  

                                                                                  Code to process json:

                                                                                      DynamicJsonDocument doc(1024);
                                                                                      deserializeJson(doc,"{\"cmd\":\"set\",\"prefs\":[{\"coins\":4},{\"enable\":true}]}");
                                                                                      JsonObject root=doc.as();
                                                                                      for (JsonPair kv : root) {
                                                                                          Serial.println(kv.key().c_str());
                                                                                          Serial.println(kv.value().as());
                                                                                      }
                                                                                      JsonObject prefs=doc["prefs"];
                                                                                      for (JsonPair kv : prefs) {
                                                                                          Serial.println("here\n");
                                                                                          Serial.println(kv.key().c_str());
                                                                                  //        Serial.println(kv.value().as());
                                                                                      }
                                                                                  

                                                                                  I would expect to see the following output:

                                                                                  cmd
                                                                                  set
                                                                                  prefs
                                                                                  coins
                                                                                  enable
                                                                                  

                                                                                  But I only get what seems to be an empty prefs object:

                                                                                  cmd
                                                                                  set
                                                                                  prefs
                                                                                  

                                                                                  The example shown in the official docs almost gets me there, and is what I have in my code. This example from github is similar, but I can't seem to adapt it to my case.

                                                                                  ANSWER

                                                                                  Answered 2022-Feb-07 at 19:12

                                                                                  Since prefs is an array, convert it to JsonArray

                                                                                  JsonArray prefs = doc["prefs"].as();
                                                                                  for (JsonObject a : prefs) {
                                                                                      for (JsonPair kv : a) {
                                                                                          Serial.println(kv.key().c_str());
                                                                                          if (kv.value().is()) {
                                                                                              Serial.println(kv.value().as());
                                                                                          }
                                                                                          else {
                                                                                              Serial.println(kv.value().as());
                                                                                          }
                                                                                      }
                                                                                  }
                                                                                  

                                                                                  Source https://stackoverflow.com/questions/71023794

                                                                                  QUESTION

                                                                                  ESP32 Arduino httpSecureClient -1 error at core 0 without reason why
                                                                                  Asked 2021-Dec-27 at 21:39

                                                                                  I'm having an issue with the httpsecureclient library for the ESP in the Arduino IDE.

                                                                                  I try to send http requests to a https domain (that doesn't change) and works alot of times just fine.

                                                                                  Like I do some HTTP calls to obtain certain data to let the ESP do it's thing. But when I want to let the ESP post a payload to a server, using the WiFiClientSecure and HTTPClient, it sometimes works without issues, but all of a sudden, it stops working and throws me the well known, nothing saying -1 response code...

                                                                                  The code I ues to send a heartbeat is the following;

                                                                                  #include 
                                                                                  #include 
                                                                                  #include 
                                                                                  
                                                                                  WiFiClientSecure ApiClient;
                                                                                  HTTPClient ApiHttpClient;
                                                                                  
                                                                                  
                                                                                  StaticJsonDocument<256> doc;
                                                                                  doc["mac"] = deviceMacAddress;
                                                                                  doc["key"] = DEVICE_SECRET;
                                                                                  doc["type"] = DIGITAL_HQ_SOFTWARE_TYPE;
                                                                                  String heartbeatData;
                                                                                  serializeJson(doc, heartbeatData);
                                                                                  ApiClient.setInsecure(); //skip verification of SSL cert
                                                                                  Serial.println("Sending Heartbeat");
                                                                                  ApiHttpClient.begin(ApiClient, DIGITAL_HQ_HEARTBEAT_ENDPOINT);
                                                                                  ApiHttpClient.addHeader("Content-Type", "application/json");
                                                                                  ApiHttpClient.setUserAgent(DIGITAL_HQ_USER_AGENT);
                                                                                  int responseCode = ApiHttpClient.POST(heartbeatData); // just post, Don't care about the response.
                                                                                  if (responseCode != 200) {
                                                                                      failedApiCalls ++;
                                                                                  }
                                                                                  Serial.print("ResponseCode from heartbeat: ");
                                                                                  Serial.println(responseCode);
                                                                                  // Free resources
                                                                                  ApiHttpClient.end();
                                                                                  

                                                                                  this code runs on core 0, via the following function; xTaskCreatePinnedToCore(sendHeartBeat, "Send Heartbeat", 20000, NULL, 25, &heartBeatTask, 0);

                                                                                  I do call the heartbeat once in the main core, then it works, but then on the second core, it sometimes does, but other times, it doesnt.

                                                                                  There is nothing too fancy about this, I think and I really can't seem to figure this one out...

                                                                                  Side notes:

                                                                                  There is an MQTT connection running to the AWS IoT hub, on core 1, where I don't have any issues with.

                                                                                  ANSWER

                                                                                  Answered 2021-Dec-27 at 21:39

                                                                                  I currently run into same troubles after updating the libraries, old code for esp32 http clients stopped to work with the same symptoms.

                                                                                  I could solve this by switching to simply use HTTPClient only, without WiFiClientSecure. And it works with https.

                                                                                  #include 
                                                                                  #include 
                                                                                      
                                                                                  void getPricesFromKraken(){
                                                                                      String url = "https://api.kraken.com/0/public/Ticker?pair=DOGEUSD,XBTUSD";
                                                                                      
                                                                                      HTTPClient http;
                                                                                      JSONVar data;
                                                                                        
                                                                                      http.begin(url.c_str());
                                                                                      int httpResponseCode = http.GET();
                                                                                      
                                                                                      if (httpResponseCode > 0) {
                                                                                          String payload = http.getString();
                                                                                          data = JSON.parse(payload);
                                                                                          Serial.println(data);
                                                                                      }
                                                                                      else {
                                                                                          Serial.printf("http response code: %d\n", httpResponseCode);
                                                                                      }
                                                                                      http.end();
                                                                                  }
                                                                                  

                                                                                  Source https://stackoverflow.com/questions/69642797

                                                                                  QUESTION

                                                                                  ESP8266WiFi.h: No such file or directory
                                                                                  Asked 2021-Nov-16 at 18:25

                                                                                  How can I make the WifiManager library work on a ESP32 board? I'm using PlatformIO to develop my code.

                                                                                  Here are my imports:

                                                                                  #include "esp_camera.h"
                                                                                  #include 
                                                                                  #include 
                                                                                  #include 
                                                                                  #include 
                                                                                  #include 
                                                                                  #include 
                                                                                  
                                                                                  WiFiClient espClient;
                                                                                  PubSubClient client(espClient);
                                                                                  
                                                                                  WiFiManager wifiManager;
                                                                                  

                                                                                  platformio.ini

                                                                                  [env:esp32cam]
                                                                                  platform = espressif32
                                                                                  board = esp32cam
                                                                                  framework = arduino
                                                                                  monitor_speed = 115200
                                                                                  build_flags = -DMQTT_MAX_PACKET_SIZE=36000
                                                                                  lib_deps = 
                                                                                      espressif/esp32-camera@^1.0.0
                                                                                      knolleary/PubSubClient@^2.8
                                                                                      bblanchon/ArduinoJson@^6.18.5
                                                                                      tzapu/WiFiManager@^0.16.0
                                                                                  

                                                                                  But when I run the code, I get this following error:

                                                                                  .pio\libdeps\esp32cam\WiFiManager/WiFiManager.h:16:25: fatal error: ESP8266WiFi.h: No such file or directory
                                                                                  

                                                                                  After further research, I see that WiFiManager uses ESP8266WiFi.h and now I'm wondering how I can make this library work on my ESP32 or is there an alternative library? The project's readme does say it works on ESP32.

                                                                                  ANSWER

                                                                                  Answered 2021-Nov-16 at 18:22

                                                                                  The latest release of WiFiManager library (0.16) is almost a year old and doesn't support ESP32.
                                                                                  You will need to install the library from Github to get ESP32 support.

                                                                                  In your platformio.ini replace

                                                                                  tzapu/WiFiManager@^0.16.0
                                                                                  

                                                                                  with

                                                                                  https://github.com/tzapu/WiFiManager.git@^2.0.5-beta
                                                                                  

                                                                                  Source https://stackoverflow.com/questions/69982473

                                                                                  QUESTION

                                                                                  ESP32 Firebase: authenticating results in error code 400 - but Firebase does recognize my login
                                                                                  Asked 2021-Oct-15 at 10:16

                                                                                  I am trying to authenticate using signIn() method and exact replica of example code from ESP32 Client library (the new version)

                                                                                  • When I run my code I successfully connect to WiFi and also I can successfully CREATE new account from the ESP32 board.
                                                                                  • I need to know if my log in or registration was successful
                                                                                  • In my Firebase authentication signup with email/pass is enabled.

                                                                                  In my serial monitor I can read that the error code is 400 this:

                                                                                  Code that I am using:

                                                                                  Serial.printf("Firebase Client v%s\n\n", FIREBASE_CLIENT_VERSION);
                                                                                  
                                                                                  /* Assign the api key (required) */
                                                                                  fb_config.api_key = API_KEY;
                                                                                  
                                                                                  /* Assign the user sign in credentials */
                                                                                  fb_auth.user.email = email_name.c_str();
                                                                                  fb_auth.user.password = email_name.c_str();
                                                                                  
                                                                                  /* Assign the RTDB URL */
                                                                                  fb_config.database_url = DATABASE_URL;
                                                                                  
                                                                                  Firebase.reconnectWiFi(true);
                                                                                  fb_do.setResponseSize(4096);
                                                                                  
                                                                                  /* Assign the callback function for the long running token generation task */
                                                                                  fb_config.token_status_callback = tokenStatusCallback; //see addons/TokenHelper.h
                                                                                  
                                                                                  /** Assign the maximum retry of token generation */
                                                                                  fb_config.max_token_generation_retry = 5;
                                                                                  
                                                                                  /* Initialize the library with the Firebase authen and config */
                                                                                  Firebase.begin(&fb_config, &fb_auth);
                                                                                  
                                                                                  if(Firebase.authenticated()){
                                                                                    Serial.println("I am authenticated");
                                                                                  } else {
                                                                                    Serial.println("Well I AM NOT???");
                                                                                  }
                                                                                  

                                                                                  Screenshot from my Firebase authentication that my ESP32 was created and also logged in today:

                                                                                  I know my Firebase initialization was successful because I can read and write read data into the Realtime database:

                                                                                  I am using PlatformIO and this is my config file:

                                                                                  [env:esp32dev]
                                                                                  platform = espressif32
                                                                                  board = esp32dev
                                                                                  framework = arduino
                                                                                  monitor_speed = 115200
                                                                                  build_flags = -D PIO_FRAMEWORK_ARDUINO_MMU_CACHE16_IRAM48_SECHEAP_SHARED
                                                                                  lib_deps = 
                                                                                      mobizt/Firebase Arduino Client Library for ESP8266 and ESP32@^2.5.4
                                                                                      bblanchon/ArduinoJson@^6.18.5
                                                                                  

                                                                                  ANSWER

                                                                                  Answered 2021-Oct-15 at 10:16
                                                                                  • The problem was that I was checking for the Firebase.authenticated() method too early, and the Firebase did not have time to authenticate.
                                                                                  • If I check it in the main loop() it works.

                                                                                  GitHub discussion where we find the solution.

                                                                                  Source https://stackoverflow.com/questions/69567284

                                                                                  QUESTION

                                                                                  Arduino HTTP.post() returns -11
                                                                                  Asked 2021-Sep-27 at 11:51

                                                                                  I cannot not find a solution for this problem. Everything worked very well when I tried a month ago, but now, when I launch it, it does not work anymore. The problem occurs when I send http.POST(data); request to the given address, but Serial.println(httpResponseCode); returns -11. I've tested my domain URL on Postman and everything worked there. Thank you for any help.

                                                                                  #include 
                                                                                  #include 
                                                                                  #include 
                                                                                  #include 
                                                                                  #include 
                                                                                  #include 
                                                                                  
                                                                                  #define ONE_WIRE_BUS 4 // D2 pin of NodeMCU
                                                                                  
                                                                                  OneWire oneWire(ONE_WIRE_BUS);
                                                                                  DallasTemperature sensors(&oneWire);
                                                                                  
                                                                                  // Time configuration
                                                                                  unsigned long lastTime = -300000;
                                                                                  unsigned long timerDelay = 300000;
                                                                                  unsigned long errorThreshold = 5000;
                                                                                  
                                                                                  // WiFi configuration
                                                                                  const char *ssid = "myssid";
                                                                                  const char *wifiPassword = "mypass";
                                                                                  
                                                                                  // Authentication configuration
                                                                                  const char *username = "myusername";
                                                                                  const char *password = "mypassword";
                                                                                  
                                                                                  // Domain name with URL path or IP address with path
                                                                                  const char *authentication = "myurl";
                                                                                  
                                                                                  // Functions
                                                                                  int authenticate();
                                                                                  
                                                                                  // HTTP
                                                                                  WiFiClient client;
                                                                                  HTTPClient http;
                                                                                  String token = "";
                                                                                  
                                                                                  void setup()
                                                                                  {
                                                                                    // Sets the data rate in bits per second for serial data transmission
                                                                                    Serial.begin(9600);
                                                                                  
                                                                                    WiFi.begin(ssid, wifiPassword);
                                                                                    Serial.println("Connecting to WiFi...");
                                                                                  
                                                                                    while (WiFi.status() != WL_CONNECTED)
                                                                                    {
                                                                                      delay(500);
                                                                                      Serial.print(".");
                                                                                    }
                                                                                  
                                                                                    Serial.println();
                                                                                    sensors.begin();
                                                                                  
                                                                                    Serial.print("Connected to WiFi with IP Address: ");
                                                                                    Serial.print(WiFi.localIP());
                                                                                    Serial.print("\n\n");
                                                                                  
                                                                                    while (authenticate() != 200) {
                                                                                      
                                                                                    }
                                                                                  }
                                                                                  
                                                                                  void loop()
                                                                                  {
                                                                                    if ((millis() - lastTime) > timerDelay)
                                                                                    {
                                                                                      if (WiFi.status() == WL_CONNECTED)
                                                                                      {
                                                                                        // ...
                                                                                      }
                                                                                      else
                                                                                      {
                                                                                        Serial.println("WiFi Disconnected");
                                                                                        digitalWrite(2, LOW);
                                                                                        delay(2000);
                                                                                        digitalWrite(2, HIGH);
                                                                                  
                                                                                        lastTime = millis() - timerDelay + errorThreshold;
                                                                                      }
                                                                                    }
                                                                                  }
                                                                                  
                                                                                  int authenticate()
                                                                                  {
                                                                                    // Add headers to Authorization request
                                                                                    http.begin(client, authentication);
                                                                                    http.addHeader("Content-Type", "application/json");
                                                                                  
                                                                                    String data = "{\"username\":\"" + String(username) + "\"," +
                                                                                                  "\"password\":\"" + String(password) + "\"}";
                                                                                  
                                                                                    // Send Authorization request
                                                                                    int httpResponseCode = http.POST(data);
                                                                                    token = http.getString();
                                                                                  
                                                                                    Serial.println(httpResponseCode);
                                                                                  
                                                                                    return httpResponseCode;
                                                                                  }
                                                                                  

                                                                                  I use Visual Code as a code editor. My platformio.ini:

                                                                                    lib_deps =
                                                                                           milesburton/DallasTemperature @ ^3.9.1
                                                                                           bblanchon/ArduinoJson @ ^6.18.4
                                                                                  

                                                                                  ANSWER

                                                                                  Answered 2021-Sep-27 at 11:51
                                                                                  http.begin(client, authentication);
                                                                                  

                                                                                  Please make sure the authentication URL is HTTP and not HTTPS.

                                                                                  Source https://stackoverflow.com/questions/69327002

                                                                                  QUESTION

                                                                                  How to copy all members of a json object to a 2d array given that the object name matches (ArduinoJson)
                                                                                  Asked 2021-Aug-27 at 12:41

                                                                                  I am working on an Arduino project that will mix cocktails for me. I've decided to save a list of cocktails in a JSON file named cocktails.json, which is saved on an SD card, and upon cocktail selection, I would like the Arduino to find its recipe in the JSON file. A small snippet of the JSON looks like this:

                                                                                  {
                                                                                    "Cocktails": {
                                                                                          "Americano": {
                                                                                              "campari": 1
                                                                                              "red vermouth": 2
                                                                                              "soda": 3
                                                                                          },
                                                                                          "Aviation": {
                                                                                              "gin": 1,
                                                                                              "cherry liqueur": 2,
                                                                                              "creme de violette": 3,
                                                                                              "lemon juice": 4
                                                                                          },
                                                                                          "B52 Cocktail": {
                                                                                              "kahlua": 1,
                                                                                              "baileys": 2,
                                                                                              "trand marnier": 3
                                                                                          }
                                                                                      }
                                                                                  }
                                                                                  

                                                                                  Say I tell the Arduino I want the cocktail "Americano". I would like the Arduino to copy all the data under object "Americano" and save it to a 2D array I created in the following struct:

                                                                                  
                                                                                  struct cocktailData
                                                                                  {
                                                                                    char name[25];
                                                                                    char portions[7][1];
                                                                                  } data;
                                                                                  
                                                                                  

                                                                                  The array is initialized as [7][1] because there are up to 8 potential ingredients and they're all paired with an amount multiplier. I can't figure out how to copy the entire string into the array so that it saves the recipe in memory. Im using the ArduinoJson library to parse the JSON file. The end goal is that the array would look something like this:

                                                                                  
                                                                                  portions[0-7][0]=
                                                                                  
                                                                                  "campari", "red vermouth", "soda", (the rest is null)
                                                                                  
                                                                                  portions[0-7][1]=
                                                                                  1, 2, 3, (the rest is null)
                                                                                  

                                                                                  ANSWER

                                                                                  Answered 2021-Aug-27 at 12:41

                                                                                  As I mentioned in comment, if you are saving data in SD (and writing C++), there is no need to add extra layer of encoding/decoding of JSON, you can read and write data with C++ struct.

                                                                                  Before showing how to to do read/write of struct into file, the struct you shown won't hold the data you want to represent, each cocktail recipe consists of name (a string), and an array of ingredients, each ingredient consists a string, and byte that represent the type of liquor and portion. So we are dealing with a struct within a struct.

                                                                                  typedef struct {
                                                                                    char liquor[20];
                                                                                    uint8_t portion;
                                                                                  } Ingridient;
                                                                                  
                                                                                  typedef struct {
                                                                                    char name[20];
                                                                                    Ingridient ingridients[7];
                                                                                  } Cocktail;
                                                                                  
                                                                                  Cocktail cocktails[] = {
                                                                                      {"Americano", { {"campari", 1}, {"red vermouth", 2}, {"soda", 3} } },
                                                                                      {"Aviation", { {"gin", 1}, {"cherry liqueur", 2}, {"creme de violette", 3}, {"lemon juice", 4} } },
                                                                                      {"B52 Cocktail", { {"kahlua", 1}, {"baileys", 2}, {"trand marnier", 3} } }
                                                                                  };
                                                                                  

                                                                                  Writing a struct into a file or reading struct from the file is just like writing a series of bytes into a file, all you need to do is to tell where is your struct located in memory (i.e. a pointer to the struct), and what is the size of the struct.

                                                                                  As I don't have an Arduino with SD card with me, so I show it using SPIFFS on ESP32, it should be quite similar to SD, and you should have no problem to convert the code to be used with SD card.

                                                                                  Here is the complete example.

                                                                                  #include 
                                                                                  
                                                                                  typedef struct {
                                                                                    char liquor[20];
                                                                                    uint8_t portion;
                                                                                  } Ingridient;
                                                                                  
                                                                                  typedef struct {
                                                                                    char name[20];
                                                                                    Ingridient ingridients[7];
                                                                                  } Cocktail;
                                                                                  
                                                                                  void setup() {
                                                                                   
                                                                                    Serial.begin(115200);
                                                                                  
                                                                                    Cocktail cocktails[] = {
                                                                                      {"Americano", { {"campari", 1}, {"red vermouth", 2}, {"soda", 3} } },
                                                                                      {"Aviation", { {"gin", 1}, {"cherry liqueur", 2}, {"creme de violette", 3}, {"lemon juice", 4} } },
                                                                                      {"B52 Cocktail", { {"kahlua", 1}, {"baileys", 2}, {"trand marnier", 3} } }
                                                                                    };
                                                                                   
                                                                                    if(!SPIFFS.begin()){
                                                                                        Serial.println("Error while mounting SPIFFS");
                                                                                        return;
                                                                                    }
                                                                                   
                                                                                    //--------- Write a struct to file
                                                                                    File fileToWrite = SPIFFS.open("/cocktails.txt", FILE_WRITE);
                                                                                    
                                                                                    if(fileToWrite) {
                                                                                      for (int i=0; i<3; i++) {
                                                                                        fileToWrite.write( (uint8_t *) &cocktails[i], sizeof(cocktails[i]) );
                                                                                      }
                                                                                    }
                                                                                    
                                                                                    fileToWrite.close();
                                                                                    
                                                                                    
                                                                                    //---------- Read a struct from file
                                                                                    Cocktail c[3];  //struct for holding the content from the file
                                                                                    
                                                                                    File fileToRead = SPIFFS.open("/cocktails.txt");
                                                                                    
                                                                                    if(fileToRead) {
                                                                                      Serial.println("Data from file...");
                                                                                      for (int i=0; i<3; i++) {
                                                                                        fileToRead.read( (byte *) &c[i], sizeof(c[i]) );
                                                                                        Serial.println(c[i].name);
                                                                                        int n = 0;
                                                                                        while (strlen(c[i].ingridients[n].liquor)) {
                                                                                          Serial.print(c[i].ingridients[n].liquor);
                                                                                          Serial.print(" - ");
                                                                                          Serial.print(c[i].ingridients[n].portion);
                                                                                          n++;
                                                                                        }
                                                                                        Serial.println();
                                                                                      }
                                                                                    }
                                                                                  
                                                                                    fileToRead.close();
                                                                                  }
                                                                                   
                                                                                  void loop() {}
                                                                                  

                                                                                  Source https://stackoverflow.com/questions/68915210

                                                                                  QUESTION

                                                                                  Getting [e][wifigeneric.cpp:739] hostbyname(): dns failed when performing POST request
                                                                                  Asked 2021-Jul-24 at 20:10

                                                                                  I am getting started with electronics and microcontrollers programming.

                                                                                  I have made a simple circuit where I use DHT22 sensor to measure temperature and humidity. I have also made my own API in Node and Express (MongoDB as a database). It is very simple API, just two endpoints: one for getting. and one for posting data. I ma able to create succesfull requests using Postman (and with the browser).

                                                                                  Just to be clear, I want to send temperature and humidity to my API, and then do some work with this data on Vue website (I think that this is not relevant at all, but again, just to be clear what I am trying to achieve).

                                                                                  Now I will say what I am using:

                                                                                  Windows 10 OS NodeMCU ESP32 microcontroller DHT22 sensor HTTPClient library (I think this one is causing a problem) PlatformIO with Arduino.h header file Everything is ok, but when I try to send data to my database things fail. I am ALWAYS getting following error

                                                                                  [e][wifigeneric.cpp:739] hostbyname(): dns failed

                                                                                  I have tried to make the POST request using both http://localhost:3000/endpoint and http://127.0.0.1/endpoint (that part is really strange, why I am getting DNS error when using IP address without domain name?).

                                                                                  I have already looked up for the solution on the web. I have come across many similar questions on github, but any of them worked for me). Also, none of them were solving error caused by line 739.

                                                                                  Here I will leave my code. Is is simple and short, so I will post all of it. Please, do not blame me for my c++ skills, I am getting better :D

                                                                                  Thank you in advance, have a nice day or evening.

                                                                                  Kind regards, Bartek.

                                                                                  #include 
                                                                                  #include 
                                                                                  #include 
                                                                                  #include 
                                                                                  #include 
                                                                                  #include 
                                                                                  #include 
                                                                                  
                                                                                  #define DHTPIN 22
                                                                                  #define DHTTYPE DHT22
                                                                                  
                                                                                  DHT dht(DHTPIN, DHTTYPE);
                                                                                  
                                                                                  const char ssid[] = "MY_SSIID";
                                                                                  const char password[] = "MY_WIFI_PASSWORD";
                                                                                  const char apiAddress[] = "http://localhost:3000/reading";
                                                                                  
                                                                                  unsigned long lastTime = 0;
                                                                                  unsigned long timerDelay = 60000;
                                                                                  
                                                                                  struct sensorReading {
                                                                                    float temperature;
                                                                                    float humidity;
                                                                                    float heatIndex;
                                                                                  };
                                                                                  
                                                                                  sensorReading readDataFromSensor();
                                                                                  void sendData(sensorReading * reading);
                                                                                  
                                                                                  void setup() {
                                                                                    Serial.begin(9600);
                                                                                    dht.begin();
                                                                                  
                                                                                    WiFi.begin(ssid, password);
                                                                                  
                                                                                   WiFi.config(IPAddress(192, 168, 1, 223), IPAddress(192, 168, 1, 1), IPAddress(255, 255, 255, 0));
                                                                                  
                                                                                    while(WiFi.status() != WL_CONNECTED) {
                                                                                      delay(500);
                                                                                      Serial.print('.');
                                                                                    }
                                                                                  
                                                                                  }
                                                                                  
                                                                                  void loop() {
                                                                                    if (millis() > lastTime + timerDelay) {
                                                                                      sensorReading data;
                                                                                      sensorReading * p_data = NULL;
                                                                                      data = readDataFromSensor();
                                                                                      p_data = &data;
                                                                                      sendData(p_data);
                                                                                    }
                                                                                  }
                                                                                  
                                                                                  sensorReading readDataFromSensor() {
                                                                                    float temperature = dht.readTemperature();
                                                                                    float humidity = dht.readHumidity();
                                                                                    float heatIndex = dht.computeHeatIndex(temperature, humidity, false);
                                                                                  
                                                                                    if (isnan(temperature) || isnan(humidity)) {
                                                                                      return sensorReading {};
                                                                                    }
                                                                                  
                                                                                    const sensorReading dataToReturn {temperature, humidity, heatIndex};
                                                                                    return dataToReturn;
                                                                                  }
                                                                                  
                                                                                  void sendData(sensorReading * reading) {
                                                                                    using namespace std;
                                                                                  
                                                                                    if(WiFi.status() == WL_CONNECTED) {
                                                                                      HTTPClient http;
                                                                                  
                                                                                      http.begin(apiAddress, 3000);
                                                                                  
                                                                                      http.addHeader("Content-Type", "application/json");
                                                                                  
                                                                                      DynamicJsonDocument doc(1024);
                                                                                  
                                                                                      doc["temperature"] = reading->temperature;
                                                                                      doc["humidity"] = reading->humidity;
                                                                                      doc["heatIndex"] = reading->heatIndex;
                                                                                  
                                                                                      String dataToSend; 
                                                                                  
                                                                                      serializeJson(doc, dataToSend);
                                                                                  
                                                                                      int responseCode = http.POST(dataToSend);
                                                                                  
                                                                                      Serial.println(responseCode);
                                                                                      http.end();
                                                                                    } else {
                                                                                      Serial.print("Ups...");
                                                                                    }
                                                                                  
                                                                                    lastTime = millis();
                                                                                  }
                                                                                  

                                                                                  ANSWER

                                                                                  Answered 2021-Jul-24 at 20:10

                                                                                  You're calling the begin() method on http with two arguments, which are meant to be a hostname and a port number (and optionally a URI/path). Instead of passing a hostname, you're passing a full URL, which the HTTP client is attempting to resolve as a hostname.

                                                                                  The single argument form of http.begin() does take a URL. The form you're calling does not.

                                                                                  You can confirm this by reading the source code, which allows for these declarations of the begin() method:

                                                                                      bool begin(WiFiClient &client, String url);
                                                                                      bool begin(WiFiClient &client, String host, uint16_t port, String uri = "/", bool https = false);
                                                                                  
                                                                                  #ifdef HTTPCLIENT_1_1_COMPATIBLE
                                                                                      bool begin(String url);
                                                                                      bool begin(String url, const char* CAcert);
                                                                                      bool begin(String host, uint16_t port, String uri = "/");
                                                                                      bool begin(String host, uint16_t port, String uri, const char* CAcert);
                                                                                      bool begin(String host, uint16_t port, String uri, const char* CAcert, const char* cli_cert, const char* cli_key);
                                                                                  #endif
                                                                                  

                                                                                  A big hint to this problem is that you repeated the port number in both the URL and the second argument to http.begin().

                                                                                  Instead your code should look like either:

                                                                                      http.begin(apiAddress);
                                                                                  

                                                                                  or

                                                                                  const char apiName[] = "localhost";
                                                                                  const unsigned apiPort = 3000;
                                                                                  const char apiPath[] = "reading";
                                                                                  
                                                                                  ...
                                                                                  
                                                                                      http.begin(apiName, apiPort, apiPath);
                                                                                  
                                                                                  

                                                                                  However - this also will not work because localhost and 127.0.0.1 mean "self" or "the same computer". You'll need to provide the real IP address of the server you're trying to reach; localhost and 127.0.0.1 only refer to it when you're running software on it.

                                                                                  Source https://stackoverflow.com/questions/68508224

                                                                                  QUESTION

                                                                                  Issue with WiFiNINA to get JSON data
                                                                                  Asked 2021-Jul-14 at 18:08

                                                                                  I'm trying to do a GET request to my weather forecast API service with an Arduino nano 33 IoT but I can't parse JSON data because the code output also other information inside the string, is there a way to "clean" the string with only the JSON data? Here's my code

                                                                                  #include 
                                                                                  #include 
                                                                                  #include 
                                                                                  #include "arduino_secrets.h" 
                                                                                  
                                                                                  char ssid[] = SECRET_SSID;        // your network SSID (name)
                                                                                  char pass[] = SECRET_PASS;    // your network password (use for WPA, or use as key for WEP)
                                                                                  int keyIndex = 0;            // your network key index number (needed only for WEP)
                                                                                  
                                                                                  int status = WL_IDLE_STATUS;
                                                                                  
                                                                                  char server[] = "api.weatherapi.com";    // name address for Google (using DNS)
                                                                                  
                                                                                  // Initialize the Ethernet client library
                                                                                  // with the IP address and port of the server
                                                                                  // that you want to connect to (port 80 is default for HTTP):
                                                                                  WiFiClient client;
                                                                                  
                                                                                  void setup() {
                                                                                    //Initialize serial and wait for port to open:
                                                                                    Serial.begin(9600);
                                                                                    while (!Serial) {
                                                                                      ; // wait for serial port to connect. Needed for native USB port only
                                                                                    }
                                                                                  
                                                                                    // check for the WiFi module:
                                                                                    if (WiFi.status() == WL_NO_MODULE) {
                                                                                      Serial.println("Communication with WiFi module failed!");
                                                                                      // don't continue
                                                                                      while (true);
                                                                                    }
                                                                                  
                                                                                    String fv = WiFi.firmwareVersion();
                                                                                    if (fv < WIFI_FIRMWARE_LATEST_VERSION) {
                                                                                      Serial.println("Please upgrade the firmware");
                                                                                    }
                                                                                  
                                                                                    // attempt to connect to WiFi network:
                                                                                    while (status != WL_CONNECTED) {
                                                                                      Serial.print("Attempting to connect to SSID: ");
                                                                                      Serial.println(ssid);
                                                                                      // Connect to WPA/WPA2 network. Change this line if using open or WEP network:
                                                                                      status = WiFi.begin(ssid, pass);
                                                                                  
                                                                                      // wait 10 seconds for connection:
                                                                                      delay(10000);
                                                                                    }
                                                                                    Serial.println("Connected to WiFi");
                                                                                    printWifiStatus();
                                                                                  
                                                                                    Serial.println("\nStarting connection to server...");
                                                                                    // if you get a connection, report back via serial:
                                                                                    if (client.connect(server, 80)) {
                                                                                      Serial.println("connected to server");
                                                                                      // Make a HTTP request:
                                                                                      client.println("GET /v1/forecast.json?key=9c5df5870ht454gsd0fdd8194739211006&q=Rimini&days=2&aqi=no&alerts=no HTTP/1.0");
                                                                                      client.println("Host: api.weatherapi.com");
                                                                                      client.println("Connection: close");
                                                                                      client.println();
                                                                                    }
                                                                                  }
                                                                                  void loop() {
                                                                                    // if there are incoming bytes available
                                                                                    // from the server, read them and print them:
                                                                                    while (client.available()) {
                                                                                      String payload = client.readString();
                                                                                      Serial.println(payload);
                                                                                      
                                                                                      DynamicJsonDocument doc(4000);
                                                                                      DeserializationError error = deserializeJson(doc, payload);
                                                                                      if (error) {
                                                                                        Serial.print(F("deserializeJson() failed: "));
                                                                                        Serial.println(error.f_str());
                                                                                        client.stop();
                                                                                        return;
                                                                                      }
                                                                                    }
                                                                                  
                                                                                    // if the server's disconnected, stop the client:
                                                                                    if (!client.connected()) {
                                                                                      Serial.println();
                                                                                      Serial.println("disconnecting from server.");
                                                                                      client.stop();
                                                                                  
                                                                                      // do nothing forevermore:
                                                                                      while (true);
                                                                                    }
                                                                                  }
                                                                                  
                                                                                  
                                                                                  void printWifiStatus() {
                                                                                    // print the SSID of the network you're attached to:
                                                                                    Serial.print("SSID: ");
                                                                                    Serial.println(WiFi.SSID());
                                                                                  
                                                                                    // print your board's IP address:
                                                                                    IPAddress ip = WiFi.localIP();
                                                                                    Serial.print("IP Address: ");
                                                                                    Serial.println(ip);
                                                                                  
                                                                                    // print the received signal strength:
                                                                                    long rssi = WiFi.RSSI();
                                                                                    Serial.print("signal strength (RSSI):");
                                                                                    Serial.print(rssi);
                                                                                    Serial.println(" dBm");
                                                                                  }
                                                                                  

                                                                                  The output:

                                                                                  Starting connection to server...
                                                                                  connected to server
                                                                                  HTTP/1.1 200 OK
                                                                                  Date: Wed, 14 Jul 2021 16:58:42 GMT
                                                                                  Content-Type: application/json
                                                                                  Connection: close
                                                                                  Vary: Accept-Encoding
                                                                                  Server: BunnyCDN-IT1-555
                                                                                  CDN-PullZone: 93447
                                                                                  CDN-Uid: 8fa3a04a-75d9-4707-8056-b7b33c8ac7fe
                                                                                  CDN-RequestCountryCode: IT
                                                                                  CDN-EdgeStorageId: 555
                                                                                  CDN-CachedAt: 2021-07-14 18:58:42
                                                                                  CDN-RequestPullSuccess: True
                                                                                  CDN-RequestPullCode: 200
                                                                                  Cache-Control: public, max-age=180
                                                                                  CDN-RequestId: d6bc580dc2a234693a1ad59cb34aabcb
                                                                                  CDN-Cache: EXPIRED
                                                                                  
                                                                                  {"location":{"name":"Rimini","region":"Emilia-Romagna","country":"Italy","lat":44.06,"lon":12.58,"tz_id":"Europe/Rome","localtime_epoch":1626281922,"localtime":"2021-07-14 18:58"},"current":{"condition":{},"uv":7.0},"forecast":{"forecastday":[{"date":"2021-07-14","day":{"daily_will_it_rain":0,"daily_chance_of_rain":"67","daily_will_it_snow":0,"daily_chance_of_snow":"0","condition":{}},"astro":{},"hour":[{"condition":{},"chance_of_rain":"45"},{"condition":{},"chance_of_rain":"67"},{"condition":{},"chance_of_rain":"45"},{"condition":{},"chance_of_rain":"22"},{"condition":{},"chance_of_rain":"0"},{"condition":{},"chance_of_rain":"0"},{"condition":{},"chance_of_rain":"0"},{"condition":{},"chance_of_rain":"0"},{"condition":{},"chance_of_rain":"0"},{"condition":{},"chance_of_rain":"0"},{"condition":{},"chance_of_rain":"0"},{"condition":{},"chance_of_rain":"0"},{"condition":{},"chance_of_rain":"0"},{"condition":{},"chance_of_rain":"0"},{"condition":{},"chance_of_rain":"29"},{"condition":{},"chance_of_rain":"58"},{"condition":{},"chance_of_rain":"87"},{"condition":{},"chance_of_rain":"84"},{"condition":{},"chance_of_rain":"81"},{"condition":{},"chance_of_rain":"78"},{"condition":{},"chance_of_rain":"52"},{"condition":{},"chance_of_rain":"26"},{"condition":{},"chance_of_rain":"0"},{"condition":{},"chance_of_rain":"0"}]},{"date":"2021-07-15","day":{"daily_will_it_rain":0,"daily_chance_of_rain":"0","daily_will_it_snow":0,"daily_chance_of_snow":"0","condition":{}},"astro":{},"hour":[{"condition":{},"chance_of_rain":"0"},{"condition":{},"chance_of_rain":"0"},{"condition":{},"chance_of_rain":"0"},{"condition":{},"chance_of_rain":"0"},{"condition":{},"chance_of_rain":"0"},{"condition":{},"chance_of_rain":"0"},{"condition":{},"chance_of_rain":"0"},{"condition":{},"chance_of_rain":"0"},{"condition":{},"chance_of_rain":"0"},{"condition":{},"chance_of_rain":"0"},{"condition":{},"chance_of_rain":"0"},{"condition":{},"chance_of_rain":"0"},{"condition":{},"chance_of_rain":"0"},{"condition":{},"chance_of_rain":"0"},{"condition":{},"chance_of_rain":"0"},{"condition":{},"chance_of_rain":"0"},{"condition":{},"chance_of_rain":"0"},{"condition":{},"chance_of_rain":"0"},{"condition":{},"chance_of_rain":"0"},{"condition":{},"chance_of_rain":"0"},{"condition":{},"chance_of_rain":"0"},{"condition":{},"chance_of_rain":"0"},{"condition":{},"chance_of_rain":"0"},{"condition":{},"chance_of_rain":"0"}]}]}}
                                                                                  deserializeJson() failed: InvalidInput
                                                                                  
                                                                                  disconnecting from server.
                                                                                  

                                                                                  The string "payload" start from 'HTTP/1.1 200 OK' and it should start from '{"location"....' Thanks to all who will help me.

                                                                                  ANSWER

                                                                                  Answered 2021-Jul-14 at 18:08

                                                                                  A simple solution is to modify the string.

                                                                                  Looking at the Arduino documentation for String, it seems you have several functions available to you that can help solve this.

                                                                                  For example, you could use indexOf, lastIndexOf and substring to get everything between the first '{' and last '}':

                                                                                  int start = payload.indexOf('{');
                                                                                  int end = payload.lastIndexOf('}');
                                                                                  String body = payload.substring(start, end + 1);
                                                                                  

                                                                                  This is not necessarily the most robust solution (e.g. you should check whether it is possible for '{' and '}' to appear in the HTTP header), but this should give you some hints towards a solution. Then again, if this is a small project, this may well be good enough for your use case.

                                                                                  Alternatively, you could cut cut the string up based on the newline:

                                                                                  int start = payload.indexOf('\n');
                                                                                  int body = payload.substring(start + 1);
                                                                                  

                                                                                  Again, this makes assumptions about the payload format and you may wish to do some testing to verify on those assumptions.

                                                                                  (I can't test this code, so you may need to debug this and make corrections.)

                                                                                  Source https://stackoverflow.com/questions/68382412

                                                                                  QUESTION

                                                                                  How do I get Visual Studio Code to include non-standard libraries with angle brackets <>?
                                                                                  Asked 2021-Jul-09 at 03:42

                                                                                  I am trying to run a program using the ArduinoJson library with the VSC extension Code Runner but I cannot compile it.

                                                                                  There are no markup errors or warnings in VSC but when I try to run this snippet:

                                                                                  #include "../External_Libraries/ArduinoJson/ArduinoJson.h"
                                                                                  #include 
                                                                                  int main(){
                                                                                      std::cout << "Done.\n";
                                                                                      return 0;}
                                                                                  

                                                                                  I get the error output below:

                                                                                  In file included from ../External_Libraries/ArduinoJson/src/ArduinoJson.hpp:17,\
                                                                                                   from ../External_Libraries/ArduinoJson/src/ArduinoJson.h:9,\
                                                                                                   from ../External_Libraries/ArduinoJson/ArduinoJson.h:5,\
                                                                                                   from localtest.cpp:17:\ ../External_Libraries/ArduinoJson/src/ArduinoJson/Array/ArrayRef.hpp:7:10: fatal error:\ ArduinoJson/Array/ArrayFunctions.hpp: No such file or directory\
                                                                                  #include \
                                                                                           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\ compilation terminated.
                                                                                  

                                                                                  Inside the ArduinoJson library, there are some include commands using double quotes and some using angle brackets:

                                                                                  #include "src/ArduinoJson.h"
                                                                                  //...   
                                                                                  #include 
                                                                                  

                                                                                  It appears that only the include statements with angle brackets are a problem. I have tried updating my include paths in settings.json as well as in c_cpp_properties.json to cover this, but it has not worked:

                                                                                  In settings.json:

                                                                                  "C_Cpp.default.includePath": [
                                                                                      "C:\\...\\project",
                                                                                      "C:\\...\\project\\External_Libraries\\ArduinoJson\\src",
                                                                                      "C:\\...\\project\\External_Libraries\\ArduinoJson\\src\\ArduinoJson\\Array"],
                                                                                  "C_Cpp.default.compilerPath": "C:\\MinGW\\bin\\gcc.exe"
                                                                                  

                                                                                  In c_cpp_properties.json:

                                                                                  "name": "Win32",
                                                                                  "includePath":[
                                                                                      "${default}",
                                                                                      "C:/.../project",
                                                                                      "C:/.../project/External_Libraries/ArduinoJson/src/ArduinoJson/Array"],
                                                                                  "defines":[
                                                                                      "_DEBUG",
                                                                                      "UNICODE",
                                                                                      "_UNICODE"],
                                                                                  "cStandard": "gnu17",
                                                                                  "cppStandard": "gnu++14",
                                                                                  "intelliSenseMode": "windows-gcc-x86",
                                                                                  "compilerPath": "C:/MinGW/bin/gcc.exe",
                                                                                  "compilerArgs": ["-I C:\\...\\project\\External_Libraries"]
                                                                                  

                                                                                  Does anyone have any ideas what I might be doing wrong?

                                                                                  My folder structure is

                                                                                  project/
                                                                                  --src/
                                                                                  ----localtest.cpp
                                                                                  --External_Libraries/
                                                                                  ----ArduinoJson/

                                                                                  ANSWER

                                                                                  Answered 2021-Jul-09 at 03:42

                                                                                  I think you should change last includePath to "C:/.../project/External_Libraries/ArduinoJson/src". That is because actual include already has it as relative path #include

                                                                                        "name": "Win32",
                                                                                    "includePath":[
                                                                                        "${default}",
                                                                                        "C:/Users/pohl/Documents/Git/IDEAL_AgentsOnHardware",
                                                                                        "C:/.../project/External_Libraries/ArduinoJson/src"],
                                                                                    "defines":[
                                                                                        "_DEBUG",
                                                                                        "UNICODE",
                                                                                        "_UNICODE"],
                                                                                    "cStandard": "gnu17",
                                                                                    "cppStandard": "gnu++14",
                                                                                    "intelliSenseMode": "windows-gcc-x86",
                                                                                    "compilerPath": "C:/MinGW/bin/gcc.exe",
                                                                                    "compilerArgs": ["-I C:\\...\\project\\External_Libraries"]
                                                                                  

                                                                                  Source https://stackoverflow.com/questions/68180061

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                                                                                  Vulnerabilities

                                                                                  No vulnerabilities reported

                                                                                  Install ArduinoJson

                                                                                  You can download it from GitHub.

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