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POBluetooth RFCOMM / SDP connection to a RS232 adapter in android
 

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    <p>I am trying to use the Bluetooth Chat sample API app that google provides to connect to a bluetooth RS232 adapter hooked up to another device. Here is the app for reference:</p> <p><a href="http://developer.android.com/resources/samples/BluetoothChat/index.html" rel="noreferrer">http://developer.android.com/resources/samples/BluetoothChat/index.html</a></p> <p>And here is the spec sheet for the RS232 connector just for reference:</p> <p><a href="http://serialio.com/download/Docs/BlueSnap-guide-4.77_Commands.pdf" rel="noreferrer">http://serialio.com/download/Docs/BlueSnap-guide-4.77_Commands.pdf</a></p> <p>Well the problem is that when I go to connect to the device with:</p> <pre><code>mmSocket.connect(); (BluetoothSocket::connect()) </code></pre> <p>I always get an <code>IOException</code> error thrown by the <code>connect()</code> method. When I do a <code>toString</code> on the exception I get "Service discovery failed". My question is mostly what are the cases that would cause an <code>IOException</code> to get thrown in the connect method? I know those are in the source somewhere but I don't know exactly how the java layer that you write apps in and the C/C++ layer that contains the actual stacks interface. I know that it uses the bluez bluetooth stack which is written in C/C++ but not sure how that ties into the java layer which is what I would think is throwing the exception. Any help on pointing me to where I can try to dissect this issue would be incredible.</p> <p>Also just to note I am able to pair with the RS232 adapter just fine but I am never able to actually connect. Here is the logcat output for more reference:</p> <pre> I/ActivityManager( 1018): Displayed activity com.example.android.BluetoothChat/.DeviceListActivity: 326 ms (total 326 ms) E/BluetoothService.cpp( 1018): stopDiscoveryNative: D-Bus error in StopDiscovery: org.bluez.Error.Failed (Invalid discovery session) D/BluetoothChat( 1729): onActivityResult -1 D/BluetoothChatService( 1729): connect to: 00:06:66:03:0C:51 D/BluetoothChatService( 1729): setState() STATE_LISTEN -> STATE_CONNECTING E/BluetoothChat( 1729): + ON RESUME + I/BluetoothChat( 1729): MESSAGE_STATE_CHANGE: STATE_CONNECTING I/BluetoothChatService( 1729): BEGIN mConnectThread E/BluetoothService.cpp( 1018): stopDiscoveryNative: D-Bus error in StopDiscovery: org.bluez.Error.Failed (Invalid discovery session) E/BluetoothEventLoop.cpp( 1018): event_filter: Received signal org.bluez.Device:PropertyChanged from /org/bluez/1498/hci0/dev_00_06_66_03_0C_51 I/BluetoothChatService( 1729): CONNECTION FAIL TOSTRING: java.io.IOException: Service discovery failed D/BluetoothChatService( 1729): setState() STATE_CONNECTING -> STATE_LISTEN D/BluetoothChatService( 1729): start D/BluetoothChatService( 1729): setState() STATE_LISTEN -> STATE_LISTEN I/BluetoothChat( 1729): MESSAGE_STATE_CHANGE: STATE_LISTEN V/BluetoothEventRedirector( 1080): Received android.bleutooth.device.action.UUID I/NotificationService( 1018): enqueueToast pkg=com.example.android.BluetoothChat callback=android.app.ITransientNotification$Stub$Proxy@446327c8 duration=0 I/BluetoothChat( 1729): MESSAGE_STATE_CHANGE: STATE_LISTEN E/BluetoothEventLoop.cpp( 1018): event_filter: Received signal org.bluez.Device:PropertyChanged from /org/bluez/1498/hci0/dev_00_06_66_03_0C_51 V/BluetoothEventRedirector( 1080): Received android.bleutooth.device.action.UUID </pre> <p>The device I'm trying to connect to is the <code>00:06:66:03:0C:51</code> which I can scan for and apparently pair with just fine.</p> <hr> <p>The below is merged from a similar question which was successfully resolved by the selected answer here:</p> <h2><A HREF="http://stackoverflow.com/questions/2443572/how-can-one-connect-to-an-rfcomm-device-other-than-another-phone-in-android">How can one connect to an rfcomm device other than another phone in Android?</A></h2> <p>The Android API provides examples of using <A HREF="http://developer.android.com/reference/android/bluetooth/BluetoothAdapter.html#listenUsingRfcommWithServiceRecord(java.lang.String,%20java.util.UUID)" rel="noreferrer">listenUsingRfcommWithServiceRecord()</A> to set up a socket and <A HREF="http://developer.android.com/reference/android/bluetooth/BluetoothDevice.html#createRfcommSocketToServiceRecord(java.util.UUID)" rel="noreferrer">createRfcommSocketToServiceRecord()</A> to connect to that socket.</p> <p>I'm trying to connect to an embedded device with a <A HREF="http://www.sparkfun.com/commerce/product_info.php?products_id=582" rel="noreferrer">BlueSMiRF Gold</A> chip. My working Python code (using the <A HREF="http://code.google.com/p/pybluez/" rel="noreferrer">PyBluez</A> library), which I'd like to port to Android, is as follows:</p> <pre><code>sock = bluetooth.BluetoothSocket(proto=bluetooth.RFCOMM) sock.connect((device_addr, 1)) return sock.makefile() </code></pre> <p>...so the service to connect to is simply defined as channel 1, without any SDP lookup.</p> <p>As the only documented mechanism I see in the Android API does SDP lookup of a UUID, I'm slightly at a loss. Using "sdptool browse" from my Linux host comes up empty, so I surmise that the chip in question simply lacks SDP support.</p>
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