This article explains how to install Mqtt broker on Siemens Simatic IoT2040. In this article Mosca Mqtt broker is used. System Model: The Modbus Energy Meter is used as client that publishes Voltage, Current, and Frequency values to Mosca broker installed on Siemens Simatic IoT2040. The broker on Simatic will then publish the data to NETPIE APP ID that is subscribed to the same topic as publisher. Getting Started: The Simatic IoT2040 works based on Yocto Linux, the image need to be installed on SD -card and should be inserted into Simatic. The detail instructions of installing Yocto Linux and connecting Modbus Energy Meter to Simatic can be found . here Siemens Simatic IoT2040 Modbus Energy Meter Installing Mosca on Siemens Simatic IoT2040: Install Mosca on Simatic using npm as described below npm install mosca bunyan -g To test Mosca, run the below command mosca -v | bunyan If you get the output similar to below picture, “Congrates”, you have successfully installed Mosca on Simatic IoT2040. Running Mosca broker on Simatic IoT2040 Installing nodes on Node-Red: Install netpie node npm install -g node-red-contrib-netpie Install Mosca Mqtt broker node npm install -g node-red-contrib-mqtt-broker Install modbus node npm install -g node-red-contrib-modbus For transfering data from broker (installed on Simatic) to NETPIE, first the Simatic should be authenticated by NETPIE, for this purpose microgear node (netpie) is used. Once the device is authenticated, connection between Simatic and NETPIE establishes and data gets transmitted using Mosca mqtt broker. Modbus node is used to read data from Modbus Energy Meter. Node-Red Flow: Node-Red Flow Mosca Broker Node: Mosca Mqtt node Mqtt out node (publisher): Pub node Mqtt in node (subscriber): Sub node Microgear node: MicroGear node Modbus node: Modbus node Modbus client settings Function node: Function node The data read from Modbus Energy Meter will be enclosed in brackets (Ex: Voltage value: [23200]). To remove brackets and extra characters on data we use function node. NETPIE: Create Application Id on NETPIE that is subscribed to same topic as publisher node. Creating APP ID on NETPIE Creating Data Source: Datasource Creating Widget: Widget to display data Result: Energy Meter data published on NETPIE through Mosca broker

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