Thank you @JeeLet !
I've been struggling with missing msgs for years with my Arduino Mega
I changed pin and no issues!
In the pjon code I've reached to list of tested pins that communication works properly
https://github.com/gioblu/PJON/blob/38e36bb1228c1690143cfbf693a0bcb809514d6c/src/strategies/OverSampling/README.md?plain=1#L12
I mean the ESP framework version, selected by the board version
https://arduino.esp8266.com/Arduino/versions/2.0.0/doc/installing.html#:~:text=Open Boards Manager from Tools,from a drop-down box.
I finally got this to work. Unlike what the description here says, this is how to update the value:
In Home Assistant, go to Developer->Service->YAML mode:
service: text.set_value
data:
value: "967067"
target:
entity_id: text.water_meter_100_2
(change 967067 with the value you want to add to the current counter)
The service "notify.mysensors" seems to be deprecated by Home Assistant.