WebHMI supports the following communication protocols:

• Internal WebHMI registers
• Advantech Adam serial protocol
• Allen-Bradley DF1
• Allen-Bradley Ethernet/IP
• Bacnet
• Delta Electronics DVP protocol
• Mitsubishi Melsec protocol
• Modbus protocol
• MQTT protocol
• Owen protocol
• Siemens PPI
• Siemens S7 Communicatoin (Iso-Over-Tcp)
• 1Wire bus for temperature sensors
• Broadlink SPS3

The most popular custom protocols implemented are those:

• M-Bus (for heat meters (SCYLAR, SKS-3)
• DLMS/COSEM (for NIK electricity power meters)
• Omron Hostlink protocol

For more examples, please refer to this link.