I am using rxandroidble using autoconnect = true to continuously monitor data from a sensor. The app continuously scans for sensors it has previously connected to.
The data monitoring and scanning for sensors should continue all night, even if the phone is not connected to a power source.
If a sensor is connected in the evening, the app will stay connected all night, even if it disconnects momentarily.
However, if a sensor is disconnected for 6 hours during the night (because I pulled the sensor's battery), and then I reconnect the sensor battery in the morning, the phone does not appear to reconnect to the sensor.
I am constantly scanning every 8 seconds for new sensors in an Android service, but its not a WakefulService, nor is it started by a WakefulIntent. Should it be?
Any idea what could be going on? Is rxandroidble designed to keep scanning for sensors in this situation (ble device connects, goes out of range for 8 hours, then comes back into range)? Or do i need to manually attempt reconnect after disconnect, and then rxandroid will continually attempt to reconnect.
Here is my scan code:
public boolean scanForDevices(boolean on){
if(on){
if (!mBluetoothAdapter.isEnabled()) {
Log.e(TAG, "scanForDevices: bluetooth not enabled, scan failed" );
return false; // bluetooth disabled
}
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if (TheApplication.getInstance().checkSelfPermission(Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
Log.e(TAG, "scanForDevices: ACCESS_COARSE_LOCATION permission not granted, scan failed" );
return false; // App doesn't have permission granted
}
}
if (isScanning()) {
scanSubscription.unsubscribe();
} else {
scanSubscription = RxBleClientSingleton.getInstance().getRxBleClient().scanBleDevices()
.observeOn(AndroidSchedulers.mainThread())
.doOnError(this::onScanFailure)
.doOnUnsubscribe(this::clearSubscription)
.subscribe(this::onScanResult, this::onScanFailure);
//Ensure we won't Scan forever (save battery)
if (EnablePeriodicScan == true) {
handler.postDelayed(new Runnable() {
@Override
public void run() {
if (isScanning())
scanForDevices(false);
}
}, 4000);
}
}
}else{
//Turn scanning off
if(isScanning()){
scanSubscription.unsubscribe();
}
}
return true;
}
and here is my connect code:
public void RxBleConnect() {
autoConnectSetting = true;
if (false == sensorConnectionState.equals(SensorConnectionState.Disconnected)) {
Log.d(TAG, "RxBleConnect: cannot connect, #" + allowReconnect + " : " + macAddress + " isn't disconnected, currently in " + sensorConnectionState.toString() );
if ((sensorConnectionState.equals(SensorConnectionState.Connected)) && (allowReconnect > 15)) { /// reached our limit even though we are connected?
allowReconnect = 0; // reset count
Disconnect(); // disconnect sensor.
Log.d(TAG, "RxBleConnect: someone keeps knocking, appears that " + macAddress + " isn't as connected as we thought.");
}
allowReconnect ++;
return; // dont reattempt connection if already attempting to connect
}
Log.d(TAG, "RxBleConnect: connecting to sensor....");
SystemClock.sleep(400);
connectionObservable =
bleDevice.establishConnection(TheApplication.getInstance(), autoConnectSetting)
.compose(new ConnectionSharingAdapter())
.observeOn(AndroidSchedulers.mainThread())
.doOnUnsubscribe(this::RxBleDisconnect)
.takeUntil(disconnectTriggerSubject)
.doOnError(throwable -> {
Log.d(TAG, "rxBleConnection doOnError: " + throwable);
Disconnect(); // triggerDisconnect();
});
connectionSubscription = connectionObservable
.flatMap(RxBleConnection::discoverServices)
.subscribe(this::RxBleOnConnectionReceived, this::RxBleOnConnectionFailure);
}
If the connection state changes to disconnect, I don't attempt reconnect manually; either scanning or autoconnect should take care of this issue right?
I have turned off "App Optimization" aka Doze mode for the app in android battery settings, but I don't know if that is doing anything.
EDIT 1: Here are my logs.... we connect ok the first time, then we attempt connecting, then we immediately disconnect:
>>> FIRST CONNECTION <<<
12-09 21:23:46.904 8992-8992/appName D/PeripheralManager: RxBleConnect: connecting to sensor...., auto connect = false
onConnectionStateChange newState=2 status=0
12-09 21:23:09.298 8992-8992/appName D/PeripheralManager: onConnectionStateChange: new state RxBleConnectionState{CONNECTED}
12-09 21:23:46.831 8992-9004/appName D/BluetoothGatt: onClientConnectionState() - status=8 clientIf=5 device=E0:CF:8D:98:69:6A
12-09 21:23:46.832 8992-9004/appName D/RxBle#BluetoothGatt: onConnectionStateChange newState=0 status=8
12-09 21:23:46.897 8992-8992/appName D/PeripheralManager: onConnectionStateChange: new state RxBleConnectionState{DISCONNECTED}
12-09 21:23:46.897 8992-8992/appName D/Peripheral Manager: setConnectionState: Set e0:cf:8d:98:69:6a connection state to Disconnected
12-09 21:23:46.898 8992-8992/appName E/PeripheralManager: ### sendDisconnectNotification: mid = 2698601
>>> ATTEMPT RECONNECT HERE <<<<
12-09 21:23:46.904 8992-8992/appName D/PeripheralManager: RxBleConnect: connecting to sensor...., auto connect = true
12-09 21:23:46.915 8992-9004/appName D/RxBle#Radio: QUEUED RxBleRadioOperationDisconnect(250971465)
12-09 21:23:46.916 8992-9070/appName D/RxBle#Radio: STARTED RxBleRadioOperationDisconnect(250971465)
12-09 21:23:46.922 8992-9004/appName D/BluetoothGatt: setCharacteristicNotification() - uuid: f8c00003-159f-11e6-92f5-0002a5d5c51b enable: false
12-09 21:23:46.928 8992-9004/appName D/RxBle#Radio: QUEUED RxBleRadioOperationDescriptorWrite(49261423)
12-09 21:23:47.306 8992-8992/appName D/RxBle#Radio: QUEUED RxBleRadioOperationConnect(200794900)
12-09 21:23:47.316 8992-8992/appName D/PeripheralManager: onConnectionStateChange: new state RxBleConnectionState{CONNECTING}
12-09 21:23:47.316 8992-8992/appName D/Peripheral Manager: setConnectionState: Set e0:cf:8d:98:69:6a connection state to Connecting…
12-09 21:23:47.340 8992-8992/appName D/BluetoothManager: getConnectionState()
12-09 21:23:47.340 8992-8992/appName D/BluetoothManager: getConnectedDevices
12-09 21:23:47.347 8992-9070/appName D/RxBle#Radio: FINISHED RxBleRadioOperationDisconnect(250971465)
12-09 21:23:47.348 8992-9070/appName D/RxBle#Radio: STARTED RxBleRadioOperationDescriptorWrite(49261423)
12-09 21:23:47.348 8992-8992/appName D/PeripheralManager: rxBleConnection doOnError: BleGattException{status=8, bleGattOperation=BleGattOperation{description='CONNECTION_STATE'}}
12-09 21:23:47.355 8992-8992/appName D/PeripheralManager: observeConnectionStateChanges FINISHED
12-09 21:23:47.355 8992-8992/appName D/PeripheralManager: rxBleConnection doOnError: BleGattException{status=8, bleGattOperation=BleGattOperation{description='CONNECTION_STATE'}}
Thanks!
2nd EDIT:
Code for consuming
private void RxBleOnConnectionReceived(RxBleDeviceServices services) { // discover services
connectionsCount ++;
Log.d(TAG, "RxBleOnConnectionReceived: Discovered services");
setConnectionState(SensorConnectionState.Connected);
try {
connectionSubscription = connectionObservable
.flatMap(rxBleConnection -> rxBleConnection.setupNotification(BluetoothLeUart.RX_UUID))
.doOnError(throwable -> {
Log.d(TAG, "RxBleOnConnectionReceived setupNotification doOnError: " + throwable);
Disconnect();
})
.doOnNext(notificationObservable -> {
// Notification has been set up
})
.flatMap(notificationObservable -> notificationObservable) // <-- Notification has been set up, now observe value changes.
.observeOn(AndroidSchedulers.mainThread())
.doOnError(throwable -> {
Log.d(TAG, "RxBleOnConnectionReceived doOnError: " + throwable);
})
.subscribe(
bytes -> {
// Given characteristic has been changes, here is the value.
processReceivedMessage(bytes);
},
throwable -> {
/*handle throwable*/
Log.e(TAG, "RxBleOnConnectionReceived: processReceivedMessage： " + throwable );
}
);
