Modbus profiles examples

[Erwin van der Zwart]

Looked quickly and noticed this already:

res, err = mb:readregisters(6, nappartamento)

Where nappartamento seems to be a value around 200 resulting in a command where you try to read register 6 to 206 at once and those 200 registers probably don’t even exist (consecutive), given the “res, err =“ you probably want to read only register 6..

I think your command needs to be:
res, err = mb:readregisters(6)