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    <p>OK, it took a bit of playing around to get the MindSet connected reliably.</p> <p>The command-line bluetooth tools are more or less useless. The only repeatable way to read off the Mindset (once paired via BlueMan) was to do this:</p> <pre><code> bash$ sudo /etc/init.d/bluetooth stop bash$ sudo /etc/init.d/bluetooth start bash$ sudo rfcomm connect /dev/rfcomm0 00:13:##:##:##:## 1 bash$ ./mindset_capture.rb </code></pre> <p>...but this reaches EOF before a valid ThinkGear packet has been received.</p> <p>Instead, pair using Blueman.</p> <p>Setup:</p> <ol> <li>bash$ blueman-manager &amp;</li> <li>enable pairing on MindSet</li> <li>Click Search in BlueMan</li> <li>Select MindSet device</li> <li>Click on Pair</li> <li>Enter PIN (0000)</li> </ol> <p>Connect:</p> <ol> <li>bash$ blueman-manager &amp;</li> <li>Right-click on MindSet and select "Connect To: Dev B" (serial connector icon)</li> <li>Run capture utility (e.g. bash$ ./mindset_capture.rb)</li> <li>Right-click on MindSet and select "Disconnect: Dev B"</li> <li>Quit Blueman</li> <li><p>Restart bluetooth to release rfcomm0 (thanks, BlueMan!) </p> <p>bash$ sudo /etc/init.d/bluetooth stop; sudo /etc/init.d/bluetooth start</p></li> </ol> <p>Wouldn't it be better to have a completely command-line driven solution? Yes, yes it would. Unfortunately, the Bluetooth stack on Linux seems to be in a state where the GUI tools and the command line tools do not cooperate -- and the command-line tools do not support pairing (* UPDATE - see comments).</p> <p>Reading from the device is straightforward. It continuously transmits bytes, so read from it until you encounter two SYNC bytes (0xAA), which mark the beginning of a packet. The structure of the packet is described in <strong>mindset_communications_protocol.pdf</strong>, which is supplied in the MDT.</p> <p>Ruby code for reading from the MindSet:</p> <pre><code> require 'rubygems' # gem install serialport require 'serialport' conn = SerialPort.new "/dev/rfcomm0", 57600 while true next if conn.readbyte != 0xAA next if conn.readbyte != 0xAA while true c = conn.readbyte break if c == 0xAA puts "%02X" % c end end </code></pre> <p>It's not perfect as it does no real parsing, but that's how bytes are read from the device.</p>
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    1. POAccessing serial data from Neurosky Mindset over bluetooth in linux
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    1. POAccessing serial data from Neurosky Mindset over bluetooth in linux
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    1. COSample code uploaded here: https://github.com/mkfs/mindset
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    2. COThanks a lot! I basically came to the same conclusions though your detail is more thorough and very helpful! My main problem was that (at the time of asking that question) was not authorizing before trying to read data. I decided the easiest way to pair effectively was to just do it by hand each time using blueman-manager...though I'm going to look more closely at what you're doing when I have the chance. I've decided to just write a reader/parser in C. It wasn't that bad after I read http://people.csail.mit.edu/albert/bluez-intro/. Though it would be nice to pair from command line...
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      1. USThomas Nyberg
    3. COI suppose I should update this before some pedantic maintainer of the Linux Bluetooth stack stumbles upon this post and takes umbrage. The command line tools *do* support pairing (via bluez-simple-agent), but rfcomm connect does not create a usable SPP connection. It seems (from a cursory scan of http://people.csail.mit.edu/albert/bluez-intro/) that the rfcomm utility expects the user to create the actual Bluetooth socket to the serial device it creates, and that Blueman takes care of this for you.
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