在Android 2.3上实现OBEX PUSH服务器

Posted 2021-04-05

我需要在android 2.3设备上设置应用内OBEX服务器。使用蓝牙聊天示例代码我能够设置OBEX服务器。但是，服务器需要使用自定义UUID，因此该服务未注册为“OBEX服务器”

# 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

因此，当我收到数据时，看起来我收到的是原始OBEX连接请求：

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

是否有我可以使用的OBEX实现，或者我是否必须自己实现协议？

我不想使用内置的OBEX服务器 - 这必须在应用程序中。我尝试过BlueCove，但是在注册服务时遇到问题我放弃了它。

是的，我确实看到了this帖子，并在其中阅读了link，但通过高兴，必须有一个更简单的方法！

答案

我自己最终实现了协议。它没有我想象的那么毛茸茸。由于我只希望连接一个特定的客户端，而且我知道客户端只会推送一个文件，所以我只能部分地实现我需要的协议部分。

一些有助于理解OBEX协议的文档是Obex13.pdf：http://gitorious.org/gammu/gsm-docs/trees/e5161a75fb1e1c1608959b27ae3c3940bcf0911b/standards/obex

我如何解析套接字输入流的快速片段:(注意OBEXUtils和OBEXConstants是我的类。）

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)...
}

截止OBEXConstant：

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;

另一答案

也许这有帮助：com.android.bluetooth.pbap.BluetoothPbapObexServer