MQTT | MQTT Client Library for Swift 3.0 on Linux
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MQTT Client Library for Swift 3.0 on Linux
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QUESTION
I am working on an MQTT application that communicates with an SQLite Database (I am using python and SQLite3) First, I've created my database, you will find below the corresponding python code. And then wrote the Publisher and Subscriber scripts. The problem is that when executing the Subscriber Script to get the user name, I am getting this output :
...ANSWER
Answered 2022-Mar-31 at 10:40The incoming message payload will always be a byte array (as indicated by the leading b'
when printed), if you want to convert it to a string you should use:
QUESTION
I am using 'org.eclipse.paho:org.eclipse.paho.client.mqttv3:1.2.5' for mqtt service and the app keeps crashing on android 12 devices with the following crash logs
...ANSWER
Answered 2022-Feb-21 at 12:36Update the library of firebase:
implementation platform('com.google.firebase:firebase-bom:29.1.0') implementation 'com.google.firebase:firebase-messaging'
and remove implementation 'com.google.firebase:firebase-messaging:23.0.0'
QUESTION
I have a node.js file that subscribes to a topic and upon receiving a published message scans a local mysql db for the most recent entry in a variable named "command". Command values will trigger various responses, but I have left this portion out since my issue is before this.
My mysql query appears to be giving me errors. I am trying to look for the most recent entry of the command column and assign the value to a var command. I thought this code would do the trick:
...ANSWER
Answered 2022-Mar-14 at 00:05I am getting the following response which seems to indicate an error in the mysql query
That's not an error in your MySQL query. It's a null reference error because you're trying to use result
outside the callback.
Changing your code to this will work:
QUESTION
I publish 1000 messages from an MQTT Server when a client subscribes to a topic. Some of the messages are not received by the MQTT Client. Is this a bug or am I implementing something wrong?
Here are the server and client configuration examples.
Server Configuration ...ANSWER
Answered 2022-Mar-27 at 23:38As per the comments the issue was with the configuration of the MqttNet Broker.
The setting MaxPendingMessagesPerClient
defaults to 250
meaning that when there are 250 messages awaiting delivery for a specific client, and another message arrives, the first message in the queue will be dropped.
Your application is sending messages faster than the receiver can process them so the queue builds quickly and messages are lost. The last 250 messages arrive without issue because nothing new is being sent (so the broker has no need to drop further messages).
To fix this you can use WithMaxPendingMessagesPerClient
e.g.
QUESTION
I'm trying to limit the amount of X ticks displayed on the ChartJS config, but it keeps ignoring the setup.
...ANSWER
Answered 2022-Mar-24 at 09:42This is because you are using V2 of chart.js while using V3 syntax. For V2 all x axes scales are in an array calles xAxes and not their own object.
For the full docs you can see them here
Live example:
QUESTION
So im trying to implement a multi-site server-side blazor application that has two services implemented as singletons like this:
...ANSWER
Answered 2022-Mar-24 at 22:55Not only do you have multiple calls, you also have a memory leak. The event subscription will prevent the Monitor object to be collected.
Make the page IDisposable:
QUESTION
Targeting S+ (version 31 and above) requires that one of FLAG_IMMUTABLE or FLAG_MUTABLE be specified when creating a PendingIntent. I got it after updating target SDK to 31. the error always come after AlarmPingSender. But i dont know any class that used AlarmPingSender.
...ANSWER
Answered 2021-Oct-31 at 07:02Possible solution
Upgrade google analytics to firebase analaytics. Hope it'll solve your problems.Also upgrade all the library what're you using.
For me below solutions solve the problem.
Add PendingIntent.FLAG_IMMUTABLE
to your pending intents.
Here is an example -
PendingIntent pendingIntent = PendingIntent.getActivity(this, alarmID, notificationIntent, PendingIntent.FLAG_IMMUTABLE);
For further information follow this link - https://developer.android.com/reference/android/app/PendingIntent#FLAG_IMMUTABLE
QUESTION
Hi I am trying to run remote debugging using dlv inside a docker container with VSCode. Problem starts when I specify docker-compose flag network_mode: host instead of the specific port (This is required due to use of MQTT). This causes VSCode to throw to the following error: "Failed to continue: "Error: connect ENCONNREFUSED ...""
.vscode/launch.json
...ANSWER
Answered 2022-Jan-07 at 10:20There can be a multitude of reasons why it does not work for you. Among them are:
- The host networking driver only works on Linux hosts, so if you use Docker for Mac, Docker for Windows or Docker Enterprise Edition it won't work.
- The port
2345
might be already in use on your machine, and thedelve
process might not be able to bind it. - You might be using the wrong hostname when connecting to your session (your snippet shows
127.0.0.1
but it is commented out, and I don't know what IP it selects when one is not provided).
I am not sure why you are trying to use the host networking mode however, as it is normally useful for two main use-cases: it is more performant to use it when a docker container needs to bind a large range of ports (hundreds or thousands of ports), and can be convenient when running a Docker swarm as long as services do not have conflicting ports within the swarm.
It doesn't seem to me like any of those cases are related to the situation you describe, so even though that was not your original question, it is my recommendation that you look for other solutions to solve the problem which you attempted to solve by using host networking mode.
QUESTION
i've installed mqtt at my router and uses WEB UI to control this. here are some lines that i added into mosquitto.conf
...ANSWER
Answered 2022-Jan-05 at 08:49Solution!!
Since service
is not executeable, instead of using service
, i just executed mosquitto via mosquitto command.
https://forum.openwrt.org/t/mqtt-service-command-is-not-working-via-c-lua/116434/2
QUESTION
I'm trying to figure something out here
I have a 'sequence' to be executed via a serial port (on an RPI).
I have an supervisored PHP command in Laravel running that connects to a MQTT broker.
When I send a message to that broker, the RPI picks it up and processes it. Now, I have a moment in which I wait for user interaction. The issue here is, sometimes the user does not interact with the system and the PI keeps "waiting" for serial data. When a user presses a button, I get serial data, which I can process.
I tried to use a while (true) {}
loop that reads the serial data, but it just stops suddenly. Here is some example code;
ANSWER
Answered 2021-Dec-05 at 12:15If you look at the source of lepiaf\SerialPort you'll find it sets the stream in non blocking mode, however the read method does an infinite loop until it finds the separator. This means it will never return unless the separator is received, and depending on your configuration your script will be killed once the php max execution time is reached. Since the library is very simple the better option is to edit the read method adding a timeout parameter. Edit the file "lepiaf/SerialPort/SerialPort.php", scroll down to the read method (line 107) and change it as follows:
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