arexxd

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Arexx Data Logger Daemon

(c) 2011--2012 Martin Mares

You can use and distribute this program under the terms of GPLv2.

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AREXX Engineering (http://www.arexx.com/) makes nice data loggers for monitoring
temperature, humidity and CO2 levels. They consist of a base station (BS-500)
and multiple wireless sensors. The base station can be connected to a PC over
USB to download the data points and synchronize clock.

However, all Linux support they provide is a single statically linked binary,
which can send data to a remote web server. I was not satistified with that,
so I reverse-engineered the communication protocol and wrote my own software.

This package contains a daemon (arexxd), which watches USB and whenever the
data logger is connected, it downloads all data points from its memory and
continues fetching all further measurements in real time. Also, it synchronizes
the clock of the logger to the system time. The data points are stored in a RRD
database (see http://oss.oetiker.ch/rrdtool/), but you can easily tweak the
source to process the data in any way you like.

This program is not supported or endorsed by AREXX in any way. Also, there is
no warranty on what it does or does not. However, if you have any bug reports
or suggestions, I will be glad to hear them.

To build the program, you need development packages for libusb-1.0 and librrd
(they are probably called -dev in your system). You might want
to tweak init-arexxd script, which expects that an account called "arexxd"
exists in /etc/passwd. Also, you can customize the correct_point() function
in arexxd.c.