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POAndroid Bluetooth - Can't connect out
 

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    <p>I am developing an application which uses Bluetooth to connect to a device and send/receive data. I am doing all of my testing with a Nexus One phone.</p> <p>I have never been able to establish a SPP (serial port) connection from my phone to any device. However, I <b>have</b> been able to connect from a device (my laptop) to my phone using a Mac equivalent of PuTTY (The only exception to this is the "Bluetooth File Transfer" app from the Marketplace seems to work, but I don't think that uses RFCOM/SPP...).</p> <p>I keep seeing this message in my LogCat logs:</p> <pre><code>ERROR/BluetoothService.cpp(78): stopDiscoveryNative: D-Bus error in StopDiscovery: org.bluez.Error.Failed (Invalid discovery session) </code></pre> <p>as well as these:</p> <pre><code>java.io.IOException: Operation Canceled java.io.IOException: Software caused connection abort </code></pre> <p></p> <p>I have tried using the UUID of "00001101-0000-1000-8000-00805F9B34FB" and I have also tried using the:</p> <pre><code>Method m = device.getClass().getMethod("createRfcommSocket", new Class[] { int.class }); sock = (BluetoothSocket) m.invoke(device, Integer.valueOf(1)); </code></pre> <p>method instead of <code>device.createRfcommSocketToServiceRecord(UUID);</code> as well--with no luck.</p> <p>I am using the <a href="http://developer.android.com/resources/samples/BluetoothChat/index.html" rel="noreferrer">BluetoothChat example</a> and variations of that code to do all of my testing...</p> <p>Solutions or suggestions would be great...or even a better/less complex example of some testing code I can run on the phone, or a python script or something I can run on my computer to help debug?</p> <p>Thanks! I hope this isn't a bug with the Android OS, but if it is I hope to find a workaround.</p> <hr> <p>EDIT: I should also note that most devices show up as "paired, but not connected" in the Bluetooth settings.</p> <hr> <p>EDIT 2: The solution seems to be simply disabling any Bluetooth listening. See my answer post for more information.</p>
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    1. COOther noteworthy topics related to this issue: 1) http://stackoverflow.com/questions/2268365/android-bluetooth-cross-platform-interoperability 2) http://stackoverflow.com/questions/2661932 3) http://groups.google.com/group/android-developers/browse_thread/thread/348c269f2ef88327/ 4) http://stackoverflow.com/questions/2660968/how-to-prevent-android-bluetooth-rfcomm-connection-from-dying-immediately-after 5) http://stackoverflow.com/questions/1953888/bluetooth-rfcomm-sdp-connection-to-a-rs232-adapter-in-android
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    2. COdid you use reflection with intent or by coincidence? The reason I ask is, I'm wondering if you used it as a way to work around a particular bug in the Bluetooth implementation? Ordinarily I would think one could have just used `BluetoothSocket bs = createRfCommSocket(...`. Thanks!
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    3. CO@Brad - It was intentional, because I have seen several people online having issues with createRfcommSocketToServiceRecord which were only resolved by using this unusual workaround. See: http://stackoverflow.com/questions/2660968/how-to-prevent-android-bluetooth-rfcomm-connection-from-dying-immediately-after --and-- http://stackoverflow.com/questions/2661932/problem-with-bluetooth-on-android-2-1-samsung-spica-i5700-where-pairing-works-b
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