Modbus MQTT and Node-Red

Modbus is a de facto standard, truly open and the most widely used network protocol in the industrial manufacturing environment.-ref Modbus Faqs Because of its popularity there is a growing requirement for reading data and controlling Modbus devices over TCP/IP networks using MQTT.

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My Modbus Working Notes

I have developed a few flows for third parties that have mainly involved decoding Modbus data. However I have never used Modbus in a live environment and needed to get familiar with the basics in order to develop and test these flows. Fortunately the people I worked with had a very good understanding of Modbus, but not of node-red, JavaScript and MQTT These are my working notes from my efforts to create these flows and in particular an MQTT to Modbus bridge. If you are new to Modbus you may find them useful.

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