[Flutter] get values(pressure blood) from ble device in flutter

I used this code and utilized the flutter_reactive_ble package to read the blood pressure (systolic, diastolic) from my device in mmHg and pulse rate in bpm, but I am struggling to figure out how to do it , In my console, I received :

D/BluetoothGatt(21288): setCharacteristicNotification() - uuid: 00002a35-0000-1000-8000-00805f9b34fb enable: true I/flutter (21288): Received raw data for blood pressure measurement: [222, 136, 244, 32, 243, 255, 7, 228, 7, 1, 19, 22, 55, 0, 188, 242, 1, 68, 1]

@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('BLE Scanner'),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
ElevatedButton(
onPressed: _scanForDevices,
child: Text('Scan for Devices'),
),
SizedBox(height: 20),
Text('Discovered Devices:'),
Expanded(
child: ListView.builder(
itemCount: devices.length,
itemBuilder: (context, index) {
final device = devices[index];
return ListTile(
title: Text(device.name ?? 'Unknown'),
subtitle: Text(device.id),
onTap: () {
_connectToDevice(device.id);
_subscribeToBloodPressureMeasurement(device.id);
},
);
},
),
),
],
),
),
);
}

void _scanForDevices() {
flutterReactiveBle.scanForDevices(
withServices: [],
scanMode: ScanMode.lowLatency,
).listen(
(device) {
final existingDeviceIndex =
devices.indexWhere((d) => d.id == device.id);
if (existingDeviceIndex != -1) {
setState(() {
devices[existingDeviceIndex] = device;
});
} else {
setState(() {
devices.add(device);
});
}
},
onError: (error) {
print('Error: $error');
},
);
}

void _connectToDevice(String deviceId) {
flutterReactiveBle
.connectToDevice(
id: deviceId,
servicesWithCharacteristicsToDiscover: {
Uuid.parse('00001810-0000-1000-8000-00805f9b34fb'): [ // Caractéristique de mesure de la pression artérielle Uuid.parse('00002a35-0000-1000-8000-00805f9b34fb'), // Caractéristique des fonctionnalités de la pression artérielle Uuid.parse('00002a49-0000-1000-8000-00805f9b34fb'), ],
},
connectionTimeout: const Duration(seconds: 2),
)
.listen(
(connectionState) {
// Gérez les mises à jour de l'état de connexion
if (connectionState == DeviceConnectionState.connected) {
print("Connected successfully to device: $deviceId");
_subscribeToBloodPressureMeasurement(deviceId);
}
},
onError: (error) {
print('Error connecting to device: $error');
// Gérez les erreurs éventuelles
},
);
}

void _subscribeToBloodPressureMeasurement(String deviceId) {
final bloodPressureCharacteristic = QualifiedCharacteristic(
characteristicId: Uuid.parse('00002a35-0000-1000-8000-00805f9b34fb'),
deviceId: deviceId,
serviceId: Uuid.parse('00001810-0000-1000-8000-00805f9b34fb'),
);

// Souscrire à la caractéristique de mesure de la pression artérielle
flutterReactiveBle
.subscribeToCharacteristic(bloodPressureCharacteristic)
.listen(
(data) {
print('Received raw data for blood pressure measurement: $data');
// Traitez les données de notification ici
},
onError: (error) {
print('Error subscribing to blood pressure measurement: $error');
// Gérez les erreurs éventuelles lors de l'abonnement
},
);
}


}

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