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Same problem with my other Chinese wemos d1 boards, the only thing I haven't tried that I can think of is changing the keep alive for the mqtt server which would delay ping requests that check for connectivity, although the standard pubsubclient doesn't support keep alive changes I'm sure there's a fork on git hub or elsewhere to change that. Also maybe changing to a node mcu v2. But I'm not sure exactly what the difference is, both clocked at 16 mhz, maybe more memory idk. I'm soon guessing a control unit at this point, but I already built the hardware and it's beautiful.

Here is the hardware.

Delays in loop we're added during late night debugging. I thought I may have been overdriving the board for some reason. Started inserting delays I loop instead of at the end of each function because it was easier