It's used in a lot of small embedded devices. I'm in my twenties (for reference) and I've used them a lot of ESP8266, SIM900A, SIM7000 programming. It's non-ir

It's used in a lot of small embedded devices. I'm in my twenties (for reference) and I've used them a lot of ESP8266, SIM900A, SIM7000 programming. It's non-ironically a very good system that "just works" most of the time without having to deep dive the documentation.