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<meta name="Author" content="Remco Treffkorn">
<meta name="Description" content="GPSd is a utility that can listen to a GPS or Loran Receiver and re-publish the positional data in a simpler format.">
<meta name="Keywords" content="GPS, translator, mxmap, GIS">
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<title>Bluetooth and GPSd</title>
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Bluetooth and <code>gpsd</code>
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<p>Bluetooth connections work with gpsd by leveraging rfcomm. Rfcomm
provides a serial port interface to a BT device and has been designed
to allow for automated connect/disconnect operations over bluetooth.
The steps below will allow you to use your BT GPS device automatically
whenever it is powered on and gpsd is running.</p>
<p>Note that you must be logged in as root for most of these steps.
<ol>
<li><p>First, the Bluez protcol stack must be installed. All the
documentation can be found on <a
href='http://bluez.sourceforge.net/'>http://bluez.sourceforge.net/</a>.</p></li>
<li><p>Install bluetooth for your device with the "rfcomm" module to
allow for serial port emulation.</p></li>
<li><p>Next, load the modules:
<pre>
# modprobe hci_xxx (xxx depend on your type of device)
# modprobe bluez
# modprobe l2cap
# modprobe rfcomm
</pre>
</p></li>
<li><p>If the modules have loaded successfully, type "hciconfig" and you
should see your BT interface listed under the "hci0" name.</p></li>
<li><p>Turn on your BT GPS device and scan for remote BT devices:</li>
<pre>
# hciconfig hci0 up
# hcitool scan
</pre>
<li><p>Write down the address of your BT GPS receiver (xx:xx:xx:xx:xx:xx)</p>
<li><p>Set up rfcomm. Edit /etc/bluetooth/rfcomm.conf to reflect your BT
GPS address and to enable binding.</p></li>
<pre>
#
# RFCOMM configuration file.
#
# $Id: rfcomm.conf,v 1.1 2002/10/07 05:58:18 maxk Exp $
#
rfcomm0 {
# Automatically bind the device at startup
bind yes;
# Bluetooth address of the device
device xx:xx:xx:xx:xx:xx;
# RFCOMM channel for the connection
channel 1;
# Description of the connection
comment "Your GPS Device Here";
}
</pre>
<li><p>Bind rfcomm0 (unless you are planning to reboot, in which case
it will be automatically bound, but there is really no reason to
reboot).</p></li>
<pre>
# rfcomm bind rfcomm0
</pre>
<li><p>Edit /etc/init.d/gpsd so that it automatically starts up
listening to /dev/rfcomm0</p>
<pre>
...
#GPS_DEV="/dev/ttyS3"
GPS_DEV="/dev/rfcomm0"
...
</pre>
<li><p>Restart gpsd to apply the change above</p>
<pre>
# killall -HUP gpsd
</pre>
<li><p>Connect to gpsd to test</p>
<pre>
# telnet localhost 2947
# r
</pre>
<p>You should see NMEA sentences stream by. Close telnet.</p>
<pre>
# ^c
# e
</pre>
</ol>
<p>At this point, your system should be configured to use gpsd with
your BT GPS device!</p>
<p>Known Issues:</p>
<ul>
<li><p>On system startup, gpsd starts before rfcomm0 is bound by rfcomm
and fails (at least on some systems) - a workaround for this is to add
a symlink to the gpsd init.d script to a later runlevel.</p></li>
<pre>
# cd /etc/rcS.d/
# ln -s ../init.d/gpsd S89gpsd
</pre>
</ul>
<p>Contributors:</p>
<ul>
<li><p>Jean-Michel Bouffard</p></li>
<li><p>Joshua Layne</p></li>
</ul>
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