I was just gonna make something similar as well (to control some airconditioning units via IR and MQTT over wifi) and glad to know about possible issues. I didn't know ESP8266 couldn't handle some of the higher frequency carrier waves.
I've got a few ATTiby85's lying around and might want to play with those to control the stuff with strict timing requirements. Having a single "package" composed of the ESP8266 and the ATTiny85, with Espruino as the main firmware would be cool.
That might even be a nice project: being able to flash AVR chips by sending over the compiled hex files via Espruino. Just need some documentation on the wiring and the reset pulses etc.
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