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I am currently writing a control and monitoring software system that makes use of GPIO pins. Since I was at the CCC congress in Berlin I did only have my laptop and no real GPIO hardware...

With only a laptop it's a bit hard to write GPIO software, since laptops usually don't have any GPIO pins. So what I needed to test my new software was either a real device (out of reach) or... writing a simulator.

• watchdogd(8), a daemon to periodically retrigger the watchdog(4) timer device from userland
• nmea(4), a NMEA 0183 line discipline
• nmeaattach(8), a utility to attach the nmea(4) line disciplines to ttys, no obsoleted by the newer and more general ldattach(8) command