Hard to say as all microchips have small memory it could be assembler to be in full control of speed and memory. Likely it will be c and c++ as thats easier. Picbasic is somewhere in between.
Esp8266 chip you can choose at commands or c or nodemcu if installed in proper board.
Java and lua could be a choice on rasperry pi or C.H.I.P.S. full computer stack but little overkill to read sensors but as they get cheap and more devs understand those languages could become popular.
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Open Question: for developers
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