There is an apparent bug in the Bluetooth service discovery code, as
has been mentioned by several people on several forums. The upshot is
that the BluetoothSocket.connect( ) method consistently fails to
discover a valid SPP service on some devices that are discoverable
with non-Android devices while it consistently succeeds to discover
the SPP service on seemingly identical devices. Obviously, the two
devices are not identical but the fact is that I manufacture two such
devices and there is nothing obviously different about them. I can
consistently connect to both devices from a Windows Mobile app. I
hope that Google will address this bug in the very near future. I
will be willing to test any trial bug-fixes on my devices.
Here is the relevant log output from the failed attempt:
04-24 15:23:33.268: INFO/ActivityManager(82): Starting activity:
Intent { cmp=com.thegadgetworks/.DeviceListActivity }
04-24 15:23:33.308: DEBUG/DeviceListActivity(8055): doDiscovery()
04-24 15:23:33.318: ERROR/BluetoothEventLoop.cpp(82): event_filter:
Received signal org.bluez.Adapter:PropertyChanged from /org/bluez/7766/
hci0
04-24 15:23:33.318: VERBOSE/BluetoothEventRedirector(4213): Received
android.bluetooth.adapter.action.DISCOVERY_STARTED
04-24 15:23:36.608: ERROR/BluetoothEventLoop.cpp(82): event_filter:
Received signal org.bluez.Adapter:DeviceFound from /org/bluez/7766/
hci0
04-24 15:23:36.638: VERBOSE/BluetoothEventRedirector(4213): Received
android.bluetooth.device.action.FOUND
04-24 15:23:40.368: ERROR/BluetoothEventLoop.cpp(82): event_filter:
Received signal org.bluez.Adapter:PropertyChanged from /org/bluez/7766/
hci0
04-24 15:23:40.368: ERROR/BluetoothService.cpp(82):
stopDiscoveryNative: D-Bus error in StopDiscovery:
org.bluez.Error.Failed (Invalid discovery session)
04-24 15:23:40.408: VERBOSE/BluetoothEventRedirector(4213): Received
android.bluetooth.adapter.action.DISCOVERY_FINISHED
04-24 15:23:40.418: ERROR/BluetoothService.cpp(82):
stopDiscoveryNative: D-Bus error in StopDiscovery:
org.bluez.Error.Failed (Invalid discovery session)
04-24 15:23:40.428: ERROR/BluetoothEventLoop.cpp(82):
onCreateDeviceResult: D-Bus error: org.bluez.Error.AlreadyExists
(Device already exists)
04-24 15:23:40.448: VERBOSE/BluetoothEventRedirector(4213): Received
android.bleutooth.device.action.UUID
04-24 15:23:46.448: VERBOSE/BluetoothEventRedirector(4213): Received
android.bleutooth.device.action.UUID
04-24 15:24:14.168: ERROR/BluetoothService.cpp(82):
stopDiscoveryNative: D-Bus error in StopDiscovery:
org.bluez.Error.Failed (Invalid discovery session)
And here is the log from when it successfully connected:
04-24 16:09:02.337: INFO/ActivityManager(82): Starting activity:
Intent { cmp=com.thegadgetworks/.DeviceListActivity }
04-24 16:09:02.437: DEBUG/DeviceListActivity(8230): doDiscovery()
04-24 16:09:02.457: ERROR/BluetoothEventLoop.cpp(82): event_filter:
Received signal org.bluez.Adapter:PropertyChanged from /org/bluez/7766/
hci0
04-24 16:09:02.477: VERBOSE/BluetoothEventRedirector(4213): Received
android.bluetooth.adapter.action.DISCOVERY_STARTED
04-24 16:09:05.079: ERROR/BluetoothEventLoop.cpp(82): event_filter:
Received signal org.bluez.Adapter:DeviceFound from /org/bluez/7766/
hci0
04-24 16:09:05.117: VERBOSE/BluetoothEventRedirector(4213): Received
android.bluetooth.device.action.FOUND
04-24 16:09:08.567: ERROR/BluetoothEventLoop.cpp(82): event_filter:
Received signal org.bluez.Adapter:PropertyChanged from /org/bluez/7766/
hci0
04-24 16:09:08.567: ERROR/BluetoothService.cpp(82):
stopDiscoveryNative: D-Bus error in StopDiscovery:
org.bluez.Error.Failed (Invalid discovery session)
04-24 16:09:08.607: VERBOSE/BluetoothEventRedirector(4213): Received
android.bluetooth.adapter.action.DISCOVERY_FINISHED
04-24 16:09:08.617: ERROR/BluetoothService.cpp(82):
stopDiscoveryNative: D-Bus error in StopDiscovery:
org.bluez.Error.Failed (Invalid discovery session)
04-24 16:09:08.877: ERROR/BluetoothEventLoop.cpp(82): event_filter:
Received signal org.bluez.Device:PropertyChanged from /org/bluez/7766/
hci0/dev_00_0C_84_00_72_D2
04-24 16:09:09.167: VERBOSE/BluetoothEventRedirector(4213): Received
android.bleutooth.device.action.UUID
04-24 16:09:14.647: VERBOSE/BluetoothEventRedirector(4213): Received
android.bleutooth.device.action.UUID
Please fix this bug! Thank you.
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