SDK RF Config & OTA Update

[verybadsoldier]

One question please gentlemen:

The ESP has to be initialized with the RF configuration data which is specific to the used SDK, as far as I understand it (make flashinit).
So when switching SDKs (e.g. from 2.0.0 to 3.0.0) this RF configuration data has to be updated in the device.

I assume that when using OTA update then this RF configuration is not updated accordingly (at least I would not understand how). So am I right that it is not possible to use OTA update to update from a firmware that uses SDK 2.0.0 to a firmware that uses SDK 3.0.0? So in that case before installing the new firmware the device has to be initialized with the new RF config?

[slaff]

Very good question. Take a look at PR #1491. If we start supporting ONLY SDK 3.0.0 or newer then we should be able to merge this PR and allow having different ROMS compiled with different SDKs to still work.

[verybadsoldier]

Ok thank you. But for now am I correct that switching SDK versions using OTA update is not supported and therefore this transition has to be done using the serial bootloader?

[slaff]

SDK versions using OTA update is not supported

Yes, that is correct. I would say that it will most probably work if you have old RF and use it with apps compiled with SDK 1.5, 2.0 and 3.0 but there is no guarantee.