Implement OBEX PUSH Server on Android 2.3

Question

I need to configure an OBEX server in an application on an Android 2.3 device. Using the sample bluetooth chat code, I was able to configure the OBEX server. However, the server must use a custom UUID so that the service is not registered as an “OBEX server”

# sdptool browse local ...(snip)... Service Name: OBEX Object Push Service RecHandle: 0x10000 Service Class ID List: UUID 128: ab123abc-1a2b-3c4d-5d7f-1234567890ab Protocol Descriptor List: "L2CAP" (0x0100) "RFCOMM" (0x0003) Channel: 18 

So, when I get the data, it looks like I am receiving an unhandled OBEX connection request:

 80 00 07 10 00 04 00 00 00 00 ...(snip)... 00 00 00 (1kb file) 

Is there an OBEX implementation that I can use, or should I implement the protocol myself?

I do not want to use the built-in OBEX server - this should be in the application. I tried BlueCove, but I left it when I had problems registering the service.

Yes, I looked at this and read the link in it, but golly should be an easier way!

Answer 1

As a result, I implemented the protocol myself. It was not as hairy as I imagined. Since I was expecting only a specific client to connect, and I knew that the client would only push one file, I was able to partially implement only the protocol sections that I needed.

Some of the documents that helped understand the OBEX protocol were Obex13.pdf at: http://gitorious.org/gammu/gsm-docs/trees/e5161a75fb1e1c1608959b27ae3c3940bcf0911b/standards/obex

A quick snippet of how I parsed the sockets input stream: (Note: OBEXUtils and OBEXConstants are my classes.)

 try { //Read all bytes passed in bytes = mmInStream.read(buffer); //Ensure we have the entire packet before we proceed // Packet length is in the 1st and 2nd byte expectedLength = OBEXUtils.bytesToShort(buffer[OBEXConstant.LENGTH_IDENTIFIER], buffer[OBEXConstant.LENGTH_IDENTIFIER + 1]); packetLength = bytes; //Keep reading until we get what we expect. while (packetLength < expectedLength) { bytes = mmInStream.read(buffer, packetLength, maxPacketSize); packetLength += bytes; } //Switch on Packet Header switch (buffer[OBEXConstant.HEADER_IDENTIFIER]) { case OBEXConstant.CONNECT: //Parse the packet and return an acknowledgement packet write(OBEXConnect.parsePacket(buffer)); break; case OBEXConstant.PUT: case OBEXConstant.PUT_FINAL: //Parse the PUT packet and return an acknowledgement packet //For Parsing PUT packets I referred to the android and bluecove implementations write(putPacket.appendPacket(buffer, packetLength)); break; case OBEXConstant.DISCONNECT: //Parse the packet and return an acknowledgement packet write(OBEXDisconnect.parsePacket(buffer)); break; case OBEXConstant.GET: case OBEXConstant.GET_FINAL: case OBEXConstant.SETPATH: case OBEXConstant.SETPATH_FINAL: case OBEXConstant.SESSION: //Did not implement these break; case OBEXConstant.ABORT: Log.w(Constant.TAG, TAG + "ABORT Request Received"); isDisconnected = true; break; default: break; } } catch (final IOException e) { ...(snip)... } 

OBEXConstant Snapshot:

 public static final byte FINAL_BIT = (byte) 0x80; public static final byte CONNECT = 0x00 | FINAL_BIT; //*high bit always set Connect choose your partner, negotiate capabilities public static final byte DISCONNECT = 0x01 | FINAL_BIT; //*high bit always set Disconnect signal the end of the session public static final byte PUT = 0x02; //(0x82) Put send an object public static final byte PUT_FINAL = PUT | FINAL_BIT; public static final byte GET = 0x03; //(0x83) Get get an object public static final byte GET_FINAL = GET | FINAL_BIT; //(0x83) Get get an object public static final byte SETPATH = 0x05; public static final byte SETPATH_FINAL = SETPATH | FINAL_BIT; public static final byte SESSION = 0x07; public static final byte ABORT = (byte) 0xFF; public static final byte OBEX_RESPONSE_CONTINUE = (byte) 0x90; public static final byte OBEX_RESPONSE_SUCCESS = (byte) 0xA0; 

Answer 2

maybe this helps: com.android.bluetooth.pbap.BluetoothPbapObexServer