Add BlerryConfigURL to auto download the config

[vaparr]

Added config option BlerryConfigURL to set the URL to download the config file from. This will update at every boot.

[vaparr]

Example:

BlerryConfigURL https://raw.githubusercontent.com/MyRepo/blerry/main/blerry_config.json

Will create a blerry_configurl.txt with the URL, and when loading the config, we will check to see if the file is accessible, and valid json; then place the file on the FS as blerry_config.json

restart 1 after setting the URL

[tony-fav]

This looks like a pretty useful feature but there seems to be a good bit of bulk.

Have you looked at storing the config URL via the berry persist module? This would prevent having to do even more manual file io.

Why not use the download_file function instead duplicating code?

Only worried about code size because of how difficult it is to get the blerry.be onto ESP32 consistently already.

[vaparr]

Switched to using the persist module.

The reason i didnt use download_file() is because i wanted to validate the file was valid json, before potentially overwriting a working config. Should i just blindly download the file instead, or maybe modify download_file to validate the json if it ends in .json?

[tony-fav]

@vaparr are you happy with it now? I plan to (like next weekend) deploy a few Switchbot plugs and that would give me a chance to test this out without disrupting anything (don't have an extra board setup for testing at the moment 😅), but I can go ahead and merge this now. Will clean up some duplicate things myself and hopefully do a "main" pull and release soon.

[vaparr]

@tony-fav Yep. Im running it on 8 switchbot bulbs, and seems to be working good.

[tony-fav]

Apologies, never got around to this, merging now cause it's a nifty feature. Thanks!