AutoConnect | Arduino library for ESP8266/ESP32 WLAN configuration

I'm sure this problem has been asked before, but I can't figure out how to even properly word it.

I am trying to get Bluetooth Device data into my flutter app. The examples I have found either use non-null safe versions of dart code or they hide all of the important details.

I am trying to build a very simple prototype from scratch so I can get a better grasp on things.

I want to make a stateful widget that updates based on notifyListeners(). The idea is I start out with "noName bluetooth device", then once I have a device connected, I can update the object and display the name of the connected device.

I keep running into this same roadblock and I can't get past it. I want to make a default Bluetooth Device, but the device has no default constructor. The default device cannot be null because of null safety.

Can someone help me figure this out. There is something I know I am fundamentally misunderstanding, but I don't know where to start.

The code below makes a ChangeNotifierProvider the parent of my BlueTesting widget that should display details of the connected Bluetooth Device (I haven't written all of the code yet).

The BTDevices class should update the Bluetooth Device object, and notify the app to display the updated data from "the default empty device" to the new connected device.

Thank you for your help!

So boom I'm back again with another probably-stupid question lol. I'm expanding on a helicopter game I found in a YouTube tutorial as a learning exercise. The part I'm stuck on is I'm trying to use core data to allow the user to save their score when they die, and recall those saved scores in a separate view accessible from the game's Home Screen (I'm using ContentView for the Home Screen and a separate GameView for the actual game). In my data model I define a single entity "Scores", with a single attribute "name". The Core Data usage in the GameView file returns no errors, but when I try to fetch the data in the view where I want to list the scores, I get the error:

Value of type 'FetchedResults' has no member 'name'

Here go the code for the GameView:

I have a list view of Task items. Every 10 seconds a timer triggers the function randomTasks that is responsible to modify the title and the description of each tasks in the list but the ListView doesn’t reflect the changes.I tried to use objectWillChange.send() but it doesn’t work.

I’ve noticed that when a task is modified with a different id the ListView updates and I can see the changes but when i’m in the detail view whenever randomTaskTitle is triggered the view is dismissed automatically.

I have a simple timer publisher that fires every 10 seconds.

I'm building some IoT devices which are controlled by ESP32. I want to have real time control via Android application. Because WiFi is too power hungry (my devices are battery powered) I've decided to connect using BLE which should be more suitable option.

I have Xamarin Android app which acts as a GATT server because it allows for multiple devices connected and aggregated in my app. ESP32 device connects to the server when I advertise and properly receives notifications for example when I click the button. The problem is that I have no idea how to manage the situation when user exits the app. How to restore the connections? It is no problem to save some deviceId in local db on the android device but can anyone tell me what steps should I take to achieve following results:

User connects app to the device, exits the app or leave the ble range and when he opens it again connection is restored and user can send some data to the device.

On ESP32 there seems to be no reconnect option and on android theoretically there is but when device is not a server but client (autoconnect = true) Maybe I did it the wrong way (devices should be servers but is then possible to be connected to multiple devices and achieve results of real time control?)

I will appreciate any advices :)

Here is a simple example of my problem:

In this learning app, I've followed and excellent tutorial from Hacking with Swift on generating a wave-like animation. I've modified this app further adding some functionalities:

• Providing Start/Stop mechanism for the wave animation
• Perpetually generating random numbers for the duration of the animation
• Modifying animation if an "interesting" number is found. Initially, I've implemented logic that defines even numbers as interesting but that could be easily changes to flag prime numbers, etc.

After stopping the animation does not "run" again. This is demonstrated in the gif below.

After stopping the animation does not restart.

This is what I used to create an animating gradient view

I am trying to make the next condition in swift UI:

If the timer (hours) shows 23, then tryout = tryout + 1. However, it said that my code will never be executed. So, Is there any possibility to do that?

In my app user picks up the number of days till the deadline, and I am trying to make a deadline countdown through the timer. I need a solution to read hours in the timer, so I could save a new value when the timer reaches a new day.

Maybe you have other solutions (except Calendar, because I cannot add it in my app), I will be glad to hear them!

P.S. My Code Sample: