Issue #187 - Feed watchdog in http_update_write() & ESP Ethernet OTA upload

[ianrrees]

I've only spent a couple minutes testing this on an ESP32-PoE-ISO board, but it seems to work, and it compiles OK for the targets on the releases page.

Fixes #187

[jeremypoulter]

Thanks for the contribution, I will check it out

[ianrrees]

Thank you for identifying the problem! I'm hoping to look at upgrading Mongoose this weekend.

There is something strange going on with the relationship between WiFi and Ethernet that I don't fully understand yet. I think maybe the issue is if the WiFi is connected, and ethernet too, sometimes things get in to a bad state - I've just been erasing the whole flash to nuke the saved WiFi info. Probably not worth digging too deep before a big networking change anyway.

[ianrrees]

Also, just to be clear, I don't think this really fixes the underlying problem - it's just a hacky fix for that one symptom. Really, the networking stuff shouldn't block the main loop for so long. Haven't had a chance to look at the current version of Mongoose yet, but perhaps it provides a nice way to resolve that issue. Or, I believe the ESP32 Arduino framework is actually running FreeRTOS under the hood, it might be more effective to have the OS handle the lower-level networking stuff.

[jeremypoulter]

Looks to work well.