Modbus TCP

The Gateway communicates via MQTT and publishes and listens to a number of topics.

However, in firmware 3.7.0 Modbus TCP has been added. Modbus should preferably be used on Gateways that have PSRAM like the E32 V2 and the S3/S3-LR.

Because the registers are set at runtime and may not be changed, adding new devices requires running a specific shell script that dumps all entities into a CSV file. These have to be numbered and merged back into the firmware. Contact us if you need this.

See The EMS-ESP Wiki [1] for all the details on the protocol implementation.

[1]

https://emsesp.org/Modbus/