Adding Azure Iot support

[pelikhan]

-- WORK IN PROGRESS --

• figuring out the filepath layout? (not sure what's the best practice here)
• wiring up azure iot framework
• updating circuitpython esp32spi lib
• add C++ defines to make it cloud agnostic

[ladyada]

hihi is there any matching test code so we can verify firmware? circuitpython/arduino is best but we could port from something else

[pelikhan]

Planning to update cp-esp32spi with a new command for testing

[pelikhan]

PR with circuit python test command: adafruit/Adafruit_CircuitPython_ESP32SPI#56

[ladyada]

tag @brentru

[docmollo]

@pelikhan howdy! I know you said this is a work-in-progress in your initial message, but I'm curious - should this compile as-is? Looks like it's missing some files (iothub_client.h, is the first example I hit) and I didn't see any instructions indicating I should grab other things before trying to build.

[pelikhan]

I've added instructions in the readme. This is reallly early. It builds but i haven't uploaded yet so all bets are off if the threading of Arduino will fit with the azure sdk "do work".

[pelikhan]

Suggestion welcome on how to organize all the files.

[docmollo]

OK, cool. Thanks for the instructions! I won't have time again to poke at this until this weekend. I'm not sure I'll have any decent suggestions, but I will also think about layout of the files you've added. My initial thought is it looks fine to me. shrug

[pelikhan]

Going another route.