Finally got the PYMCU IO controller: Still waiting for the Raspberry PI, but without it, I can start testing the PYMCU from my pc.
I soldered the pin contacts to the circuit board to allow me to quickly connect the PYMCU to an experiment board.
The I started with the LED sample here. A little cut and paste, and the telnet server now can control the LED:
Now, I need to find a way to control the relay from PYMCU.