@RigTig found a bug in tg9541/stm8ef that also affects this project: emiting a "Z" to the 7S-LED display shows an "S" while he's doing fancy things with the W1209. My bad. Bug fixed, but right now only in the develop branch. In other words, the base software is otherwise rather stable.
It's a bit quiet here because I'm currently bringing Forth to the HC12 wireless RS232 bridge. Robust communication to "smart things" in-house, on-premises or at > 500m in free space for about $3 and with very low power-consumption in stand-by mode.