> You're not going to be running openssl or stunnel on an 8-bit microcontroller, though. True, you may need BearSSL, as with this port: https://github.com/OPEn

> You're not going to be running openssl or stunnel on an 8-bit microcontroller, though. True, you may need BearSSL, as with this port: https://github.com/OPEnSLab-OSU/SSLClient https://github.com/OPEnSLab-OSU/SSLClient It's a bit fat for many 8 bit microcontrollers -- needs 110kB flash and 7kB RAM -- but you can get low end cortex cores that it'll work just fine with.