ModDump is a tool to sniff over Modbus/TCP Coil on port 502
Dependencies - python3, pymodbus
Modbus Resources:
IETF Internet Draft: https://datatracker.ietf.org/doc/html/draft-dube-modbus-applproto-00
Modbus Messaging Implementation Guide: https://www.modbus.org/docs/Modbus_Messaging_Implementation_Guide_V1_0b.pdf
Modbus TCP Security: https://modbus.org/docs/MB-TCP-Security-v21_2018-07-24.pdf