connect exception

[ZackHx]

when bluetoothSocket.connect();
log:
getBluetoothService() called with no BluetoothManagerCallback
java.io.IOException: read failed, socket might closed or timeout, read ret: -1

[IvBaranov]

Discovering process could be an issue as it is a heavyweight procedure.
Make sure you wait until it is over or use BluetoothAdapter.cancelDiscovery().

Discovery is not managed by the Activity, but is run as a system service, so an application should always call {@link BluetoothAdapter#cancelDiscovery()} even if it did not directly request a discovery, just to be sure.

[Muhammad-Soban]

Same error as @xiaolingcong

 rxBluetooth.observeConnectDevice(device, UUID.fromString("00001101-0000-1000-8000-00805f9b34fb"))
                    .observeOn(AndroidSchedulers.mainThread())
                    .subscribeOn(Schedulers.io())
                    .subscribe(new Consumer<BluetoothSocket>() {
                      @Override
                      public void accept(BluetoothSocket socket) throws Exception {
                        // Connected to the device, do anything with the socket
                        Log.e("B", "Connected");
                      }
                    }, new Consumer<Throwable>() {
                      @Override
                      public void accept(Throwable throwable) throws Exception {
                        // Error occured
                        Log.e("B", "Error:  " + throwable.getLocalizedMessage());
                      }
                    });

E/B: Error: read failed, socket might closed or timeout, read ret: -1

It is only connecting with my macbook and HC-06 Bluetooth Module but not with any other Bluetooth device like Android.

I think the issue is with UUID because supported UUID list doesn't show UUID that I have coded as Base UUID in code. Any suggestions?

[IvBaranov]

@Muhammad-Soban try to generate your own unique UUID while connecting two Android devices.

[Gyurme]

If you are connecting to a Bluetooth headset or similar device and if the regular UUIDs don't work , you must first query it for it's supported UUIDs and then use that to connect to it.

[NunciosChums]

I have same error. I'm use SPP + BluetoothProfile.HEADSET.
when call rxBluetooth.connectAsClient(device, UUID_SPP) => getBluetoothService() called with no BluetoothManagerCallback

but add .retryWhen { it.delay(500, TimeUnit.MILLISECONDS) }, always successfully connected after 30 second.