Added simulated tone_alarm class and enabled led class for posix build.
The simulator implements the led_init, led_on, led_off, led_toggle calls.
Signed-off-by: Mark Charlebois <charlebm@gmail.com>
Simulator listens for UDP input data at port 9876.
Data is for now comma separated. Not yet connected to the various sim
classes: accelsim, gyrosim, magsim.
Barometer measurements not yet supported.
Signed-off-by: Mark Charlebois <charlebm@gmail.com>