Why the device will connect again when we diconnect from device?

[berniechen]

I modified the nordic uart apk from this website

github.com/.../Android-nRF-UART

and I do some revising below

MainActivity.java:
if (action.equals(WearableService.ACTION_GATT_DISCONNECTED)) {
    runOnUiThread(new Runnable() {
     public void run() {
     Log.d(tAg, "UART_DISCONNECT_MSG");
     mState = UART_PROFILE_DISCONNECTED;
     //mService.close(); <--- I comment this
     }
     });
 }

When I disconnect from device, I can see log on my phone Xperia X compact (android 7.0)

BluetoothGatt: cancelOpen() - device: F1:C1:E2:24:ED:57
BluetoothGatt: onClientConnectionState() - status=0 clientIf=5 device=F1:C1:E2:24:ED:57
BluetoothGatt: onClientConnectionState() - status=0 clientIf=5 device=F1:C1:E2:24:ED:57
BluetoothGatt: discoverServices() - device: F1:C1:E2:24:ED:57
BluetoothGatt: onSearchComplete() = Device=F1:C1:E2:24:ED:57 Status=0
BluetoothGatt: setCharacteristicNotification() - uuid: 6e400003-b5a3-f393-e0a9-e50e24dcca9e enable: true

I find It will connect again after I disconnect from the device and then do discoverServi

ce and finally disconnect, why???? The workaround method is uncomment the mService.close() to release the resource when MainActivity.java gets DISCONNECT broadcast.

Below is the screen shot of my phone(we only revised UUID for UartService, there are no revising at Uart apk). When I disconnect from device at 10:18:45 and then reconnect at 10:18:47 and then send one command(this device automatically notify data to apk per 3 second) and then finally disconnect.

Another product we develop is below, because it will reconnect, so the button still show Disconnect, not Connect, and we can't change button state anymore, because it has disconnect, we can't send disconnect command to it.

below is operate null pointer.

[berniechen]

Could you post the full log ? Please kind let me know What key word you want me type?

Maybe not related but did you set Auto_connect = 1 when you connect ?

mBluetoothGatt = device.connectGatt(this, false, mGattCallback);

the parament that I set is false. Indeed, I only uncomment mService.close() at MainActivity.java, there are no revising at another source code.

Why you don't want to close the mService when it's disconnected? It's more clean to close the service there.

because we have another product, the frequency of characteristic(notify) to fast, about 10ms once, it still have same issue about disconnect from device and then reconnect again immediatly, if I don't comment mService.close(), the custom apk modifed from nordic uart will occur null point operation.

And I just reflect this problem to our firmware engineer, he said the method we can try is that when I disconnect to device, the device receive this command, and then set device to normal mode, do not reconnect again. But I really want know what happen, because the nordic sdk default setting is that trying reconnect when disconnect command received. It is not make sense the offical apk have this issue. Thank you.