另一个蓝牙连接重置

Question

我正在尝试从树莓派向Android应用发送消息。

pi上的代码如下：

os.system("systemctl start bluetooth")
os.system("hciconfig hci0 piscan")
time.sleep(0.5)
os.system("hciconfig hci0 name 'my raspberry'")

server_sock = bluetooth.BluetoothSocket(RFCOMM)
server_sock.listen(1)

...

uuid = "0000000......" # i am not showing the full uuid here
os.system("hcitool scan")
bluetooth.advertise_service(server_sock, "servername", service_id=uuid, service_classes= [uuid, SERIAL_PORT_CLASS], profiles=[SERIAL_PORT_PROFILE])

client_sock, client_info = server_sock.accept()
# this part is in a while loop which i remove in this snippet

data = ""
try :
    data = client_sock.recv()
except IOError as e :
    client_sock, client_info = server_sock.accept()

if data == "AAXX" :
    client_sock.send("ANSWER")

Android端的代码：

private final BroadcastReceiver bluetoothStateChangedReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            final String action = intent.getAction();

            if (action.equals(BluetoothAdapter.ACTION_STATE_CHANGED)) {
                final int state = intent.getIntExtra(BluetoothAdapter.EXTRA_STATE,
                        BluetoothAdapter.ERROR);
                switch (state) {
                    case BluetoothAdapter.STATE_OFF:
                        break;
                    case BluetoothAdapter.STATE_TURNING_OFF:
                        cancelBluetoothConnection();
                        break;
                    case BluetoothAdapter.STATE_ON:
                        startBluetoothConnection();
                        break;
                    case BluetoothAdapter.STATE_TURNING_ON:
                        break;
                }
            }

            //Bundle info = intent.getExtras();
            /*BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
            //String deviceAddress =  device.getAddress();


            if (action.equals( BluetoothDevice.ACTION_ACL_CONNECTED)){
                bluetoothConnected = true;
                Log.d("conncheck" , "got ACL COnnection");
                //setConnectedUI(true);
            }
            if (action.equals(BluetoothDevice.ACTION_ACL_DISCONNECTED)){
                bluetoothConnected = false;
                Log.d("conncheck" , "lost ACL COnnection");
                //setConnectedUI(false);
            }*/


        }
    };


private void checkBluetoothConnection() {
        // If bluetooth not activated ask user for bluetooth permission
        if (!BluetoothAdapter.getDefaultAdapter().isEnabled()) {
            Intent bluetoothIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
            startActivityForResult(bluetoothIntent, ENABLE_BLUETOOTH_REQUEST);
        } else {
            // Start bluetooth connection
            startBluetoothConnection();
        }
    }

    private void startBluetoothConnection() {
        RRSamplesApplication.startBluetoothConnection(bluetoothMessageReceivedListener);

        // Check if still connected
        if (!bluetoothConnectionHandlerIsRunning) {
            bluetoothConnectionHandlerIsRunning = true;
            final Handler checkConnectionStatusHandler = new Handler();
            final int delay = 5000;
            checkConnectionStatusHandler.postDelayed(new Runnable() {
                @Override
                public void run() {
                    checkConnectionStatus();
                    checkConnectionStatusHandler.postDelayed(this, delay);
                }
            }, delay);
        }
    }

    private void cancelBluetoothConnection() {
        if (RRSamplesApplication.getBluetoothThread() != null) {
            RRSamplesApplication.getBluetoothThread().interrupt();
        }
    }

    private BluetoothMessageReceivedListener bluetoothMessageReceivedListener = new BluetoothMessageReceivedListener() {
        @Override
        public void onBluetoothMessageReceived(final String message) {

            Log.d("conncheck : ", message);
            if (message.equals("ANSWER")) {
}
}
};

正在建立连接。但是随后，由于树莓不断尝试向应用发送消息，因此连接崩溃

File "<string>", line 5, in send
bluetooth.btcommon.BluetoothError: (104, 'Connection reset by peer')

如果我还将发送操作也放在try client_sock, client_info = server_sock.accept()/ except块中，则它将尝试重新建立连接，有时可能成功，有时却不成功。

在做什么错了？ ps：/etc/bluetooth/main.conf

中禁用了pnat

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