@ToSa In my use case its a pool controller I use a rtc to do several things..but the desire to sync is really just to adjust for daylight savings changes.

Topic can be closed - while I still don't understand why this 16x repetition was reproducible consistently between these nodes and always only affected the third packet, it's now no longer reproducible and for now I'll just assume it has been a connectivity issue (even if nodes were sitting with <1m distance and nothing changed) [image: upload-3db49ba5-e7d0-4d9d-bb4b-32abb12ed966.JPG]

I would really like to get OTA working here as it's freezing outside and I have to go there to update the software in the greenhouse control system. So please, can we have a 'how to' step-by-step guide to OTA? Please? S.