modbus-repl (npm): - `--host`, `-h` address of the machine hosting modbus server  - `--port`, `-p` port on which modbus server is listening, by default `502`  - `--proto`, `-P` protocol to be used, possible options are `udp` or `tcp`, by default `tcp`  - `--headless`, `-H` 
Keywords: modbus|tcp|udp|repl