I'm trying to write data to a BLE-characteristic, but I got the status 130 in my callback what means GATT_WRONG_STATE. Unfortunately, I have no idea, what state is wrong and how I can change this.
I'm using the BLE-App from the Android-connectivity samples (https://github.com/android/connectivity-samples/tree/master/BluetoothLeGatt) with minor changes so far.
Here's my DeviceControlActivity:
private final BroadcastReceiver mGattUpdateReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
final String action = intent.getAction();
if (BluetoothLeService.ACTION_GATT_CONNECTED.equals(action)) {
mConnected = true;
updateConnectionState(R.string.connected);
invalidateOptionsMenu();
} else if (BluetoothLeService.ACTION_GATT_DISCONNECTED.equals(action)) {
mConnected = false;
updateConnectionState(R.string.disconnected);
invalidateOptionsMenu();
clearUI();
} else if (BluetoothLeService.ACTION_GATT_SERVICES_DISCOVERED.equals(action)) {
// Show all the supported services and characteristics on the user interface.
displayGattServices(mBluetoothLeService.getSupportedGattServices());
} else if (BluetoothLeService.ACTION_DATA_AVAILABLE.equals(action)) {
displayData(intent.getStringExtra(BluetoothLeService.EXTRA_DATA));
testWriteToCharacteristic();
}
}
};
private void testWriteToCharacteristic() {
Log.d(TAG, "testWriteToCharacteristic");
if (mNameService == null) {
for (BluetoothGattService gattService: mBluetoothLeService.getSupportedGattServices()) {
if (gattService.getUuid().equals(SampleGattAttributes.UUID_NAME_SERVICE)) {
mNameService = gattService;
Log.d(TAG, "rename service found");
break;
}
}
mNameCharacteristic = mNameService.getCharacteristic(SampleGattAttributes.UUID_NAME_CHANNEL_CHARACTERISTICS);
}
mBluetoothLeService.writeCharacteristic(mNameCharacteristic);
}
[..]
..so I'm trying to write data right after I received the current value for that characteristic. (doing so right after ACTION_GATT_SERVICES_DISCOVERED hasn't worked either)
and here my changes to BluetoothLeService:
private final BluetoothGattCallback mGattCallback = new BluetoothGattCallback() {
[..]
@Override
public void onCharacteristicWrite(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, int status) {
Log.d(TAG, "onCharacteristicWrite, Status: " + status + ", " + characteristic.getUuid().toString());
super.onCharacteristicWrite(gatt, characteristic, status);
//Log.d(TAG, "onCharacteristicWrite value:"+characteristic.getStringValue(0)+" ");
}
@Override
public void onReliableWriteCompleted(BluetoothGatt gatt, int status) {
Log.d(TAG, "onReliableWriteCompleted");
super.onReliableWriteCompleted(gatt, status);
}
};
public void writeCharacteristic(BluetoothGattCharacteristic ch) {
if (mBluetoothGatt == null) return;
ch.setWriteType(BluetoothGattCharacteristic.WRITE_TYPE_DEFAULT);
mBluetoothGatt.beginReliableWrite();
String value = "TestValue" + new Random().nextInt(1000) + "\0";
ch.setValue(value);
mBluetoothGatt.writeCharacteristic(ch);
mBluetoothGatt.executeReliableWrite();
}
the callbackMethod "onCharacteristicWrite" is called with the status 130 GATT_WRONG_STATE. "onReliableWriteCompleted" is never called. I tried all 3 write type settings to no avail.
Heres the log output:
2020-04-08 15:03:25.540 4290-4315/com.example.android.bluetoothlegatt I/BluetoothLeService: Connected to GATT server.
2020-04-08 15:03:25.540 4290-4315/com.example.android.bluetoothlegatt D/BluetoothGatt: discoverServices() - device: E1:4B:30:8B:ED:AD
2020-04-08 15:03:25.541 4290-4315/com.example.android.bluetoothlegatt I/BluetoothLeService: Attempting to start service discovery:true
2020-04-08 15:03:26.484 4290-4307/com.example.android.bluetoothlegatt D/BluetoothGatt: onConnectionUpdated() - Device=E1:4B:30:8B:ED:AD interval=6 latency=0 timeout=500 status=0
2020-04-08 15:03:27.178 4290-4307/com.example.android.bluetoothlegatt D/BluetoothGatt: onSearchComplete() = Device=E1:4B:30:8B:ED:AD Status=0
2020-04-08 15:03:27.291 4290-4315/com.example.android.bluetoothlegatt D/BluetoothGatt: onConnectionUpdated() - Device=E1:4B:30:8B:ED:AD interval=171 latency=6 timeout=600 status=0
2020-04-08 15:03:27.340 4290-4298/com.example.android.bluetoothlegatt I/bluetoothlegat: Compiler allocated 4MB to compile void android.widget.TextView.<init>(android.content.Context, android.util.AttributeSet, int, int)
2020-04-08 15:03:28.742 4290-4290/com.example.android.bluetoothlegatt D/BluetoothAdapter: isLeEnabled(): ON
2020-04-08 15:03:28.742 4290-4290/com.example.android.bluetoothlegatt D/BluetoothLeScanner: could not find callback wrapper
2020-04-08 15:03:31.711 4290-4290/com.example.android.bluetoothlegatt D/BluetoothGatt: setCharacteristicNotification() - uuid: 33b5376e-0942-1f91-379b-ac5af36b9efa enable: true
2020-04-08 15:03:33.704 4290-4315/com.example.android.bluetoothlegatt D/BluetoothLeService: broadcast Update
2020-04-08 15:03:33.728 4290-4290/com.example.android.bluetoothlegatt D/DeviceControlActivity: testWriteToCharacteristic
2020-04-08 15:03:33.728 4290-4290/com.example.android.bluetoothlegatt D/DeviceControlActivity: rename service found
2020-04-08 15:03:34.130 4290-4307/com.example.android.bluetoothlegatt D/BluetoothLeService: onCharacteristicWrite, Status: 130, 33b5376e-0942-1f91-379b-ac5af36b9efa
Reading all characteristics value is no problem.
Any suggestions on how to solve this issue?
Best regards, Michael
EDIT - PROBLEM SOLVED:
It was the ReliableWrite causing the problem. Removed it and now it works. Thank you Emil for the hint!
