[rawe]

As a side note to your side note the Honeywell HR-20 is a nice thermostat with an Atmel microcontroller you can flash open source firmware onto and even use RFM12 radio modules with [0]. But they build different types of devices for avionics as well, e.g. wireless access points are the ones I dealt with already [1]. At least this device class is only low design assurance level (DAL E), so as long as it fails safely thats ok (it still should fulfill its MTBF of course).

[0] https://embdev.net/topic/118781?page=single [1] https://aerocontent.honeywell.com/aero/common/documents/myae...