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Data exchange with the IoT 2020 (Node-Red and Arduino) via MQTT and the internal Mosquitto

Created by: Marco Lampe at: 1/26/2018 5:36 PM (2 Replies)

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1/26/2018 5:36 PM	Rate (0)
Marco Lampe Regular Member Joined: 5/5/2017 Last visit: 5/11/2018 Posts: 2 Rating: (0)	Hello, I am new and need a recommendation on how to exchange data between IoT 2020 (Node-Red) and the Arduino side of IoT 2020 via MQTT and the internal Mosquitto server. I want to activate functions I programmed in an Arduino sketch via Node-Red. In addition, once the function has been executed, I also want to send feedback via MQTT back to Node-Red. I use the mqtt_basic example from the PubSubClient Arduino library for testing. As server IP I use the 127.0.0.1 for the Arduino example as well as for Node-Red. After that, the network interface is no longer accessible and I have no access to the IoT 2020. Does anyone maybe have an example for me or has it ever done that before? Thank you for your support Marco

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3/5/2018 8:39 AM	Rate (0)
bergmanu Gold Expert Joined: 4/28/2015 Last visit: 11/14/2018 Posts: 912 Rating: (149)	Hi, I would recommend to exchange data between a node-red flow and an Arduino sketch via a file or something. For example that you write "true" in a file stored on the IOT via node-red and read the file out with Arduino. If there is treu in in, start your sketch. Or something like that. Best regards!

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3/9/2018 10:40 AM	Rate (0)
bergmanu Gold Expert Joined: 4/28/2015 Last visit: 11/14/2018 Posts: 912 Rating: (149)	I have tested your use case with an IOT2040 successfully. I can send and receive data via MQTT to/from Arduino and node-red. The Ethernet.h library within the mqtt_basic programm claims the eth0, that's why your interface is not accessible anymore. So I did my connection via eth1. For now I do not know how to manage this with an IOT2020.. Maybe with an additional WiFi connection. So you can have access from your engineering station to the IOT2020 via a WiFI router. Does anybody else have any suggestions how to solve this with an IOT2020? Best regards!

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