Losing Mitsu connection after firmware update about esphome-mitsubishiheatpump HOT 4 CLOSED

@earwin You likely either have a flakey piece of hardware, or you need to implement a voltage divider or level shifter for the logic. My three bottom-of-the-barrel ESP8266 boards have been rock solid for several years now with just a simple voltage divider circuit on the Rx line.

from esphome-mitsubishiheatpump.

@geoffdavis I have a divider, and hardware is rock solid, except for this one specific issue.
E.g. never ever loses a connection outside of firmware upload, always does when uploading.

from esphome-mitsubishiheatpump.

I would try another D1 Mini Pro if you haven't already. Also take a look at #56 as there are several folks with flakey comms issues that have since resolved them in that thread.

from esphome-mitsubishiheatpump.

Aha, thanks. The thing that bugs me is that there is no "flakiness" whatsoever.
Memory problems from your linked issue (related to web_server) could be a good candidate for what I'm seeing — as they might have this repeatability, but no, doesn't seem so.

Anyway, as I said, just put the issue here in case someone else hits this and does a search.

from esphome-mitsubishiheatpump.