How to prevent Android bluetooth RFCOMM connection from dying immediately after .connect()?

Question

This problem has been solved! Thanks a lot to Brad, Denis and junkie! You're the heroes! :)

This is the working code. It connects to Zeemote and reads data from it.

===== Code =====

 public class ZeeTest extends Activity {     @Override     public void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.main);         try {             for (int i = 0; i < 3; i++) {                 test();             }         } catch (Exception e) {             e.printStackTrace();         }     }      private boolean connected = false;     private BluetoothSocket sock;     private InputStream in;     public void test() throws Exception {         if (connected) {             return;         }         BluetoothDevice zee = BluetoothAdapter.getDefaultAdapter().             getRemoteDevice("00:1C:4D:02:A6:55");         Method m = zee.getClass().getMethod("createRfcommSocket",             new Class[] { int.class });         sock = (BluetoothSocket)m.invoke(zee, Integer.valueOf(1));         Log.d("ZeeTest", "++++ Connecting");         sock.connect();         Log.d("ZeeTest", "++++ Connected");         in = sock.getInputStream();         byte[] buffer = new byte[50];         int read = 0;         Log.d("ZeeTest", "++++ Listening...");         try {             while (true) {                 read = in.read(buffer);                 connected = true;                 StringBuilder buf = new StringBuilder();                 for (int i = 0; i < read; i++) {                     int b = buffer[i] & 0xff;                     if (b < 0x10) {                         buf.append("0");                     }                     buf.append(Integer.toHexString(b)).append(" ");                 }                 Log.d("ZeeTest", "++++ Read "+ read +" bytes: "+ buf.toString());             }         } catch (IOException e) {}         Log.d("ZeeTest", "++++ Done: test()");     }     @Override     public void onDestroy() {         try {             if (in != null) {                 in.close();             }             if (sock != null) {                 sock.close();             }         } catch (IOException e) {             e.printStackTrace();         }         super.onDestroy();     } } 

===== Original question =====

I'm trying to connect to a Zeemote (http://zeemote.com/) gaming controller from Moto Droid running 2.0.1 firmware. The test application below does connect to the device (LED flashes) but connection is dropped immediately after that.

I'm pasting two test apps below: one that actually tries to read from input stream and second one that just sits there, waiting for the device to disconnect after 5 seconds. And yes, I do have third version :) which first waits for ACL_CONNECTED and then opens socket but there's nothing new in its behaviour.

Some background info: I can connect to the Zeemote from my laptop perfectly fine using bluez tools (log attached as well). I know for sure that Droid is able to talk to Zeemote as well because 'Game Pro' from the Market works fine with it (but then it's a driver/service so maybe it uses lower-level API?).

I noticed that 'adb bugreport' reports neither UUID nor RFCOMM channel for Zeemote while it does so for all other devices (including Moto HS815 headset, another dumb device for which 'sdp browse' reports nothing). Also, when the device boots, Zeemote's priority is 0 (others have priority 100+).

I'm quite at a loss here, I worked on it for so long that I ran out of ideas so any help would be very much appreciated (even if you don't know the answer :) )

Thanks, Max

Test application No. 1

This app tries to actually read from the device.

===== Code =====

 public class ZeeTest extends Activity {     @Override     public void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.main);         try {             test();         } catch (IOException e) {             e.printStackTrace();         }     }      private BluetoothSocket sock;     private InputStream in;     public void test() throws IOException {         BluetoothDevice zee = BluetoothAdapter.getDefaultAdapter().                       getRemoteDevice("00:1C:4D:02:A6:55");         sock = zee.createRfcommSocketToServiceRecord(                       UUID.fromString("8e1f0cf7-508f-4875-b62c-fbb67fd34812"));         Log.d("ZeeTest", "++++ Connecting");         sock.connect();         Log.d("ZeeTest", "++++ Connected");         in = sock.getInputStream();         byte[] buffer = new byte[1];         int bytes = 0;         int x = 0;         Log.d("ZeeTest", "++++ Listening...");         while (x < 2) {             x++;             try {                 bytes = in.read(buffer);                 Log.d("ZeeTest", "++++ Read "+ bytes +" bytes");             } catch (IOException e) {                 e.printStackTrace();                 try { Thread.sleep(100); } catch (InterruptedException ie) {}             }         }         Log.d("ZeeTest", "++++ Done: test()");     }     @Override     public void onDestroy() {         try {             if (in != null) {                 in.close();             }             if (sock != null) {                 sock.close();             }         } catch (IOException e) {             e.printStackTrace();         }         super.onDestroy();     } } 

===== Log =====

 04-19 22:27:01.147: DEBUG/ZeeTest(8619): ++++ Connecting 04-19 22:27:04.085: INFO/usbd(1062): process_usb_uevent_message(): buffer = add@/devices/virtual/bluetooth/hci0/hci0:1 04-19 22:27:04.085: INFO/usbd(1062): main(): call select(...) 04-19 22:27:04.327: ERROR/BluetoothEventLoop.cpp(4029): event_filter: Received signal org.bluez.Device:PropertyChanged from /org/bluez/4121/hci0/dev_00_1C_4D_02_A6_55 04-19 22:27:04.491: VERBOSE/BluetoothEventRedirector(7499): Received android.bleutooth.device.action.UUID 04-19 22:27:04.905: DEBUG/ZeeTest(8619): ++++ Connected 04-19 22:27:04.905: DEBUG/ZeeTest(8619): ++++ Listening... 04-19 22:27:05.538: WARN/System.err(8619): java.io.IOException: Software caused connection abort 04-19 22:27:05.600: WARN/System.err(8619):     at android.bluetooth.BluetoothSocket.readNative(Native Method) ... 04-19 22:27:05.717: WARN/System.err(8619): java.io.IOException: Software caused connection abort 04-19 22:27:05.717: WARN/System.err(8619):     at android.bluetooth.BluetoothSocket.readNative(Native Method) ... 04-19 22:27:05.819: DEBUG/ZeeTest(8619): ++++ Done: test() 04-19 22:27:07.155: VERBOSE/BluetoothEventRedirector(7499): Received android.bleutooth.device.action.UUID 04-19 22:27:09.077: INFO/usbd(1062): process_usb_uevent_message(): buffer = remove@/devices/virtual/bluetooth/hci0/hci0:1 04-19 22:27:09.085: INFO/usbd(1062): main(): call select(...) 04-19 22:27:09.139: ERROR/BluetoothEventLoop.cpp(4029): event_filter: Received signal org.bluez.Device:PropertyChanged from /org/bluez/4121/hci0/dev_00_1C_4D_02_A6_55 

Test application No. 2

This test connects and waits -- useful for displaying the auto-disconnect issue.

===== Code =====

 public class ZeeTest extends Activity {     @Override     public void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.main);         getApplicationContext().registerReceiver(receiver,                     new IntentFilter(BluetoothDevice.ACTION_ACL_CONNECTED));         getApplicationContext().registerReceiver(receiver,                     new IntentFilter(BluetoothDevice.ACTION_ACL_DISCONNECTED));         try {             BluetoothDevice zee = BluetoothAdapter.getDefaultAdapter().                             getRemoteDevice("00:1C:4D:02:A6:55");             sock = zee.createRfcommSocketToServiceRecord(                             UUID.fromString("8e1f0cf7-508f-4875-b62c-fbb67fd34812"));              Log.d("ZeeTest", "++++ Connecting");             sock.connect();             Log.d("ZeeTest", "++++ Connected");         } catch (IOException e) {             e.printStackTrace();         }     }      private static final LogBroadcastReceiver receiver = new LogBroadcastReceiver();     public static class LogBroadcastReceiver extends BroadcastReceiver {         @Override         public void onReceive(Context context, Intent intent) {             Log.d("ZeeReceiver", intent.toString());             Bundle extras = intent.getExtras();             for (String k : extras.keySet()) {                 Log.d("ZeeReceiver", "    Extra: "+ extras.get(k).toString());             }         }     }      private BluetoothSocket sock;     @Override     public void onDestroy() {         getApplicationContext().unregisterReceiver(receiver);         if (sock != null) {             try {                 sock.close();             } catch (IOException e) {                 e.printStackTrace();             }         }         super.onDestroy();     } } 

===== Log =====

 04-19 22:06:34.944: DEBUG/ZeeTest(7986): ++++ Connecting 04-19 22:06:38.202: INFO/usbd(1062): process_usb_uevent_message(): buffer = add@/devices/virtual/bluetooth/hci0/hci0:1 04-19 22:06:38.202: INFO/usbd(1062): main(): call select(...) 04-19 22:06:38.217: ERROR/BluetoothEventLoop.cpp(4029): event_filter: Received signal org.bluez.Device:PropertyChanged from /org/bluez/4121/hci0/dev_00_1C_4D_02_A6_55 04-19 22:06:38.428: VERBOSE/BluetoothEventRedirector(7499): Received android.bleutooth.device.action.UUID 04-19 22:06:38.968: DEBUG/ZeeTest(7986): ++++ Connected 04-19 22:06:39.061: DEBUG/ZeeReceiver(7986): Intent { act=android.bluetooth.device.action.ACL_CONNECTED (has extras) } 04-19 22:06:39.108: DEBUG/ZeeReceiver(7986):     Extra: 00:1C:4D:02:A6:55 04-19 22:06:39.538: INFO/ActivityManager(4029): Displayed activity zee.test/.ZeeTest: 5178 ms (total 5178 ms) 04-19 22:06:41.014: VERBOSE/BluetoothEventRedirector(7499): Received android.bleutooth.device.action.UUID 04-19 22:06:43.038: INFO/usbd(1062): process_usb_uevent_message(): buffer = remove@/devices/virtual/bluetooth/hci0/hci0:1 04-19 22:06:43.038: INFO/usbd(1062): main(): call select(...) 04-19 22:06:43.069: ERROR/BluetoothEventLoop.cpp(4029): event_filter: Received signal org.bluez.Device:PropertyChanged from /org/bluez/4121/hci0/dev_00_1C_4D_02_A6_55 04-19 22:06:43.124: DEBUG/ZeeReceiver(7986): Intent { act=android.bluetooth.device.action.ACL_DISCONNECTED (has extras) } 04-19 22:06:43.124: DEBUG/ZeeReceiver(7986):     Extra: 00:1C:4D:02:A6:55 

System logs

===== Terminal log =====

 $ sdptool browse Inquiring ... Browsing 00:1C:4D:02:A6:55 ...  $ sdptool records 00:1C:4D:02:A6:55 Service Name: Zeemote Service RecHandle: 0x10015 Service Class ID List:   UUID 128: 8e1f0cf7-508f-4875-b62c-fbb67fd34812 Protocol Descriptor List:   "L2CAP" (0x0100)   "RFCOMM" (0x0003)     Channel: 1 Language Base Attr List:   code_ISO639: 0x656e   encoding:    0x6a   base_offset: 0x100  $ rfcomm connect /dev/tty10 00:1C:4D:02:A6:55 Connected /dev/rfcomm0 to 00:1C:4D:02:A6:55 on channel 1 Press CTRL-C for hangup  # rfcomm show /dev/tty10 rfcomm0: 00:1F:3A:E4:C8:40 -> 00:1C:4D:02:A6:55 channel 1 connected [reuse-dlc release-on-hup tty-attached]  # cat /dev/tty10 (nothing here)  # hcidump HCI sniffer - Bluetooth packet analyzer ver 1.42 device: hci0 snap_len: 1028 filter: 0xffffffff < HCI Command: Create Connection (0x01|0x0005) plen 13 > HCI Event: Command Status (0x0f) plen 4 > HCI Event: Connect Complete (0x03) plen 11 < HCI Command: Read Remote Supported Features (0x01|0x001b) plen 2 > HCI Event: Read Remote Supported Features (0x0b) plen 11 < ACL data: handle 11 flags 0x02 dlen 10     L2CAP(s): Info req: type 2 > HCI Event: Command Status (0x0f) plen 4 > HCI Event: Page Scan Repetition Mode Change (0x20) plen 7 > HCI Event: Max Slots Change (0x1b) plen 3 < HCI Command: Remote Name Request (0x01|0x0019) plen 10 > HCI Event: Command Status (0x0f) plen 4 > ACL data: handle 11 flags 0x02 dlen 16     L2CAP(s): Info rsp: type 2 result 0       Extended feature mask 0x0000 < ACL data: handle 11 flags 0x02 dlen 12     L2CAP(s): Connect req: psm 3 scid 0x0040 > HCI Event: Number of Completed Packets (0x13) plen 5 > ACL data: handle 11 flags 0x02 dlen 16     L2CAP(s): Connect rsp: dcid 0x04fb scid 0x0040 result 1 status 2       Connection pending - Authorization pending > HCI Event: Remote Name Req Complete (0x07) plen 255 > ACL data: handle 11 flags 0x02 dlen 16     L2CAP(s): Connect rsp: dcid 0x04fb scid 0x0040 result 0 status 0       Connection successful < ACL data: handle 11 flags 0x02 dlen 16     L2CAP(s): Config req: dcid 0x04fb flags 0x00 clen 4       MTU 1013 (events are properly received using bluez) 

===== Part of adb bugreport =====

 --Known devices-- 00:19:A1:2D:16:EA     bonded (0) LG U830     00001105-0000-1000-8000-00805f9b34fb RFCOMM channel = 17 00:1C:4D:02:A6:55     bonded (0) Zeemote JS1 00:0B:2E:6E:6F:00     bonded (0) Motorola HS815     00001108-0000-1000-8000-00805f9b34fb RFCOMM channel = 1     0000111e-0000-1000-8000-00805f9b34fb RFCOMM channel = 2 00:1F:3A:E4:C8:40     bonded (0) BRCM BT4X     00001105-0000-1000-8000-00805f9b34fb RFCOMM channel = 9 00:18:42:EC:E2:99     bonded (0) N95     00001105-0000-1000-8000-00805f9b34fb RFCOMM channel = 9 

===== Excerpt from boot log =====

 04-18 21:55:10.382: VERBOSE/BluetoothEventRedirector(1985): Received android.bluetooth.adapter.action.STATE_CHANGED 04-18 21:55:10.421: DEBUG/BT HSHFP(1237): Loaded priority 00:19:A1:2D:16:EA = 100 04-18 21:55:10.428: DEBUG/BT HSHFP(1237): Loaded priority 00:1C:4D:02:A6:55 = 0 04-18 21:55:10.444: DEBUG/BT HSHFP(1237): Loaded priority 00:0B:2E:6E:6F:00 = 101 04-18 21:55:10.749: DEBUG/BT HSHFP(1237): Loaded priority 00:1F:3A:E4:C8:40 = 100 04-18 21:55:10.780: DEBUG/BT HSHFP(1237): Loaded priority 00:18:42:EC:E2:99 = 100 

Answer 1

Try to change your code for creating RfcommSocket:

sock = zee.createRfcommSocketToServiceRecord(                       UUID.fromString("8e1f0cf7-508f-4875-b62c-fbb67fd34812")); 

for this code:

Method m = zee.getClass().getMethod("createRfcommSocket", new Class[] { int.class }); sock = (BluetoothSocket) m.invoke(device, 1); 

Also try to change argument value in range 1-3 in this m.invoke(device, 1); When connection will be Connected, but aborted when you try reading, call in some loop your method test() again. As simple:

for(int i=0;i<3;i++){  if(!testDone) test(); }