Using serial ports for binary protocols on UN*X/Linux
It's been a very long time since I've actually been touching any application
code using serial RS-232 ports on Linux or similar OS's. If I think more about
it, it's probably about a decade now.
So in the last couple of days I was starting a program called
bs11-config, a small command line tool for initial configuration of the
BS-11 GSM BTS, part of the OpenBSC project.
The longest part of that program was actually not the code for the program itself,
but rather finding out how to properly configure the serial port in a way that
it really is completely raw, i.e. doesn't meddle with any of the rx or tx bytes
in any possible way. It's always amazing how baroque some of the traditional
UN*X interfaces are - particularly something like serial ports which traditionally
have only been used to transport ASCII characters to serial (hardware)
terminals, modems or similar equipment.
In any case, it's now working just fine. No more need for any proprietary
16bit windows programs such as LMT (local maintenance terminal) for doing the
initial configuration of a BS-11. What a relief.
What I found incredibly useful was the Serial Programming Guide for POSIX Operating Systems. Thanks, Mike!
I have back my old car
In late 2008, I 'sold' my old car (Opel Vectra) to a friend from the local
Berlin CCC (starbug) for the symbolic price of 1 EUR. I didn't mind, since
the car was not worth all that much, and it was for a friend.
As it turns out, starbug immediately said "if you need it back at any given
time, just let me know". I never thought that case would happen, but due to
recent events it actually happened.
So now I have my old car back, which makes the feeling of the Golf even more
surreal. Owned a car for about 3 months of which I was probably travelling at
least two, then suddenly lost it, and am back with the old car. Feels a bit
like I'm back in the past, rewinding back to times that one thought were gone.
In any case, big thanks starbug!
German radio station to talk with me about GPL Violations
Tomorrow at 2pm CET, I'll have a live interview in the Breitband show at the nation wide Deutschlandradio station. The show covers the
topic "Open Source and Business", and they want to talk to me for a couple of
minutes about the side-effects of businesses getting involved with
copyleft-style FOSS without respecting the rules as put forward by the