updating app state variable through custom actions

import 'dart:convert';
import 'package:flutter_blue_plus/flutter_blue_plus.dart';

Future<dynamic> parseBluetoothData(String deviceId) async {
  // Add your function code here!
  Map<String, List<int>> receivedDataMap = {};

  try {
    // Get the FlutterBluePlus instance
    BluetoothDevice device = BluetoothDevice.fromId(deviceId);

    // Check the current connection state using BluetoothConnectionState
    BluetoothConnectionState connectionState =
        await device.connectionState.first;

    if (connectionState != BluetoothConnectionState.connected) {
      // Attempt to connect to the device if it's not already connected
      print("Attempting to connect to the device...");
      await device.connect(autoConnect: true).catchError((e) {
        print("Connection failed: $e");
      });
    }

    // Recheck the connection state after attempting to connect
    connectionState = await device.connectionState.first;
    if (connectionState != BluetoothConnectionState.connected) {
      print("Failed to connect to the device.");
    }

    // Discover services on the device
    List<BluetoothService> services = await device.discoverServices();

    // Set notifications for all characteristics of the services
    for (BluetoothService service in services) {
      for (BluetoothCharacteristic characteristic in service.characteristics) {
        try {
          // Set notification for each characteristic to listen for data changes
          await characteristic.setNotifyValue(true);

          // Listen for notifications and collect the data
          characteristic.value.listen((value) {
            print("data --> ${characteristic.uuid}: $value");

            // Convert the received byte data to integer values and add to the map
            if (receivedDataMap.containsKey(characteristic.uuid.toString())) {
              receivedDataMap[characteristic.uuid.toString()]!
                  .addAll(value.map((byte) => byte.toInt()).toList());
            } else {
              receivedDataMap[characteristic.uuid.toString()] =
                  value.map((byte) => byte.toInt()).toList();
            }
          });
        } catch (e) {
          print(
              "Error setting notifications for characteristic ${characteristic.uuid}: $e");
        }
      }
    }

    // Wait for a specified duration to gather some data (adjust as needed)
    await Future.delayed(
        Duration(seconds: 2)); // Adjust duration for your use case

    // Return the collected data as a JSON string
    return jsonEncode(receivedDataMap);
  } catch (e) {
    print("Error listening to Bluetooth characteristics: $e");
    return "{}"; // Return an empty JSON object on error
  }
}