It 'the first time I program in Android, so I'm no expert.
I use Android Studio, and I would use the modbus4j library to communicate in Modbus RTU Master with a tablet (Android) through the USB port, ie serial 9600 baud.
(The tablet would be the Modbus RTU Master)
I would like to read and write Holding register, coils and register input.
There 's someone who can help me configure the project, so give me a start?
Thanks in advance.