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I have a bluetooth Handheld printer that I am able to communicate to using a SPP connection from my Mac(using Coolterm). When I'm trying to do the same from Android (using platform 7) I am running into multiple issues: The printer doesn't seem to support/need PIN Authentication. When connecting from OSX, I just selected the option that said "Do not use a pin" and it got paired. In Android, when I use device.createRfcommSocketToServiceRecord() , it always ends up asking me for a PIN/Key(which I don't have/need). I solved this using the reflection trick: Method m = device.getClass().getMethod("createInsecureRfcommSocket", new Class[] {int.class}); BluetoothSocket connection = (BluetoothSocket) m.invoke(device, 1); I am unsure whether this actually worked, but the blinking LED on the printer stops blinking, which makes me believe it did. Once I have the socket, I try to write byte data to the stream using: byte[] buffer = new byte[3]; buffer[0] = (byte) 0x8A; buffer[1] = (byte) 0xC1; buffer[2] = (byte) 0x04; outStream.write(buffer); int response = inStream.read(); mySocket.close(); Sending the same three-byte sequence from Coolterm on OSX printed a test page from the printer. However, this seems to make the thread hang on Android(the read). Is there something I am missing out here? EDIT: This seems to work only when I set channel to 1. So that means I am on to something here.

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