Service discovery failed with app based on android bluetooth chat sample
I am writing an Bluetooth game with blue tooth part based on android Bluetooth chat sample. And I have two phones to test. Here is the problem, when I connect one phone to the other, it sometimes shows the "Unable to connect device" bundle, but when I run the Bluetooth chat sample, it never shows this, so I think it is not the problem of device. Is there anyone who has studied the Bluetooth chat sample and has the same problem that would give me some help?
I try to print the exception, it is like "java.io.IOException: Service discovery failed". And here is the code that cause the exception.
private class ConnectThread extends Thread {
private final BluetoothSocket mmSocket;
private final BluetoothDevice mmDevice;
public ConnectThread(BluetoothDevice device) {
mmDevice = device;
BluetoothSocket tmp = null;
// Get a BluetoothSocket for a connection with the
// given BluetoothDevice
try {
tmp = device.createRfcommSocketToServiceRecord(MY_UUID);
} catch (IOException e) {
Log.e(TAG, "create() failed", e);
}
mmSocket = tmp;
}
public void run() {
Log.i(TAG, "BEGIN mConnectThread");
setName("ConnectThread");
// Always cancel discovery because it will slow down a connection
mAdapter.cancelDiscovery();
// Make a connection to the BluetoothSocket
try {
// This is a blocking call and will only return on a
// successful connection or an exception
mmSocket.connect();
} catch (IOException e) {
Log.e("error", e.toString());
connectionFailed();
// Close the socket
try {
mmSocket.close();
} catch (IOException e2) {
Log.e(TAG, "unable to close() socket during connection failure", e2);
}
// Start the service over to restart listening mode
BluetoothChatService.this.start();
return;
}
// Reset the ConnectThread because we're done
synchronized (BluetoothChatService.this) {
mConnectThread = null;
}
// Start the connected thread
connected(mmSocket, mmDevice);
}
public void cancel() {
try {
mmSocket.close();
} catch (IOException e) {
Log.e(TAG, "close() of connect socket failed", e);
}
}
}
The exact position is
mmSocket.connect();
I know that you would find the answer weird, to be very honest I am not very good at UUIDs. But I was having the same issue and got it resolved using this.
Answer
I think you are using the UUIDs which are hard coded in the BluetoothChat app. When I changed those UUIDs to a Well Known UUID ie; "00001105-0000-1000-8000-00805F9B34FB" it solved my problem and I no longer get that IOException--Service Discovery Failed .
So, I recommend you to change :
From:
private static final UUID MY_UUID_SECURE =
UUID.fromString("ea87c0d0-afac-11de-8a39-0800200c9a66");
private static final UUID MY_UUID_INSECURE =
UUID.fromString("7ce255c0-200a-11e0-ac64-0800200c9a66");
To
private static final UUID MY_UUID_SECURE =
UUID.fromString("00001105-0000-1000-8000-00805F9B34FB");
private static final UUID MY_UUID_INSECURE =
UUID.fromString("00001105-0000-1000-8000-00805F9B34FB");
Source to this answer.
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