MQTT to Modbus gateway

Need to connect MQTT and Modbus? The Weble WBox routes MQTT → Modbus natively: one gateway speaks both protocols and maps data points in real time — no PC, no middleware, no cloud dependency.

The protocols

Typical use case

On an industrial site, PLCs, power meters, inverters and sensors speak Modbus, while the SCADA, historian or cloud platform expects MQTT. The WBox polls the Modbus devices and publishes their data to the broker, and writes setpoints from MQTT back to the equipment. It turns a fleet of serial and TCP Modbus slaves into a clean, topic-structured MQTT feed for Industry-4.0 dashboards, predictive maintenance or remote operation — without a SCADA gateway PC.

How the WBox bridges MQTT and Modbus

Activate the Modbus and MQTT drivers. Holding and input registers are polled on a configurable cycle and published to MQTT topics as JSON, with scaling, signed values and word order handled per register. Commands on the write topics go back to holding registers. A JavaScript step can assemble a register block into one structured message, compute a derived value, or rate-limit publishing, so the broker sees meaningful data instead of raw register noise.

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