Add ability to post a file via the data param

[justmobilize]

Add ability to post a file via the data param

• Broke some common functionality into reusable blocks
• if the data object has read send it up as raw data, reading in chuncks

[jmangum]

Tested @justmobilize solution with a Pico W/OV5640 PiCowbell/PiCowbell doubler setup which posts jpeg to Adafruit IO with feed history turned-off. Works perfectly! Due to memory limitations have to reset board (I actually put it into a TimeAlarm deep sleep) after each picture acquisition and upload, but this is a small price to pay (and probably a more sensible solution for an application that one might want to run with a battery).

A couple of important implementation notes:

1. Using 640x480 image size
2. Could not use cam.quality less than 11 (otherwise run out of memory)

Thank you @justmobilize !

[jerryneedell]

Is there an example for using this? I'd like to give it a try, but I'm not sure how to use it.

[jmangum]

Sure thing @jerryneedell . Attached is my test code. Very much a work-in-progress, so please excuse the awful code. It does work as I have repeatedly posted pictures to aio.
code_iotfeeder.py.txt

[justmobilize]

@jerryneedell here is the test code I used (just used an existing file): https://gist.github.com/justmobilize/f0ee9668d7aab6d91524b3ab53953d2c

[FoamyGuy]

This looks good to me, thanks for the new functionality @justmobilize!

Thanks for testing and letting us know @jmangum.

I tested this version successfully on a Feather ESP32S3 TFT. I compared requests made with this version of the library against those made with CPython requests using the same requests.post argument values.

All of my testing was with a local flask test server, not adafruit IO specifically.

I do think it would be nice ultimately to have an example in the repo in the examples dir, it's slightly more discoverable there than in the tests.