Thanks to https://www.cncwiki.org/index.php?title=HHC-N8I8OP I managed to connect this buggy module to home assistant using modbus integration: It is important to have verify delay big to not break logic. modbus: - type: tcp host: 192.168.222.222 port: 5000 name: "modbus1" switches: - name: "hhc_r8" address: 16 write_type: coil verify: delay: 36 - name: "hhc_r7" address: 17 write_type: coil verify: delay: 37 - name: "hhc_r6" ...