Unfortunately, I can’t help. My copy-paste programming level, all that I could find and try, I outlined above.

gumilev If you need only one device you can use Tasmota software. PZEM004T v3 uses same protocol as PZEM-016 So you need set proper rx and tx gpio's in config. Thanks for the advice, it really works, this is enough to transfer data using MQTT to Domoticz. However, I will continue to wait for the pl...

Friends, I bought PZEM 004t v3, he refused to work on this firmware. I found articles in the network, how people use the corrected libraries for the PZEM 004t v3. Maybe someone of you can download a new library and upload it with a new firmware for 4mb?