Add Basic Remote Server HTTP OTA Update

[t-jones14]

UI Elements added. Successfully fetching .BIN file from remote location in VUE.JS

Probably not the "most-secure" method. Working on proof-of-concept. Need to figure out handling uploading retrieved BIN file to device.

Working off Main updateOTA function.

Any input much appreciated! I think this ability would be an excellent addition to this repo.

[t-jones14]

Successfully implemented working remote server OTA update.

ISSUES

• FIXED - Upon fetch, error is presented. Select back button then fetch again and file successfully uploads OTA. File object is successfully loaded but not sent to upload once fetch is selected. Working on it.
• [NO-FIX] CORS Policy will prevent GET request unless server allows Cross-Origin (aka not requesting from a FQDN). If fetching from Github or other provider, if their server(s) do not allow Cross-Origin the GET request will fail. Workaround to fetch from Github using this browser extension. Otherwise, only way around is using your own self-hosted webserver with "Access-Control-Allow-Origin: *" response headers or specifying the proper origin.

To-Do

• Needs to be verified functional on ESP32. I do not have one on-hand to test.

Potential Additional Features

• Implement ability to check if target device has enough available space to write update? (Will probably be future pull request). See this link.
• Add ability to hardcode remote server in code? (IN PROGRESS: Will be future pull request)
• Provide simple remote update server example with checks (security check, platform/device check, MAC verification, etc.)? (IN PROGRESS: Will be future pull request)

[playmiel]

hi I tested it works well with esp32 (wrover)

[doanerock]

That's really useful.

[ayushsharma82]

@t-jones14 I appreciate your work which has been done! but I had some other plans with ElegantOTA. As much as I would love to merge it, it will be counter productive for upcoming v3. You may create a fork for people who would like this functionality.

I'm almost finished with ElegantOTA IoT Device Management Cloud which was in the works for past 6 months and it will soon be integrated into ElegantOTA V3 library. This is mainly geared for businesses and there will also be a forever free individual plan for people who can take benefit of the platform for their own projects/hobby.

To be clear: ElegantOTA V3 library for uploading through UI will remain free as it is and it will also support more features. The new addition will be ElegantOTA Cloud.

If anybody would like to follow the V3 conversation, please check this link: #86 (comment)