If you're referring to endpoint hardware computing devices using some microcontroller similar to the esp32, you should definitely learn C. From there you can t

If you're referring to endpoint hardware computing devices using some microcontroller similar to the esp32, you should definitely learn C. From there you can tack on a low level scripting language like lua or ulisp to compliment the low level stuff that you'll be writing. This will give you the best performance and understanding of the low level hardware, not to mention it's what the majority of libraries and tutorials on the subject will be written in. If you're referring to something else, like a hub, you may want to list out your requirements and familiarity. C is still a good choice, but Go/Python/NodeJs what have you have all been used successfully for similar adventures.