# Which node to use to communicate Lumel ND30IoT with EPC 1502 via MQTT

**URL:** <https://discourse.nodered.org/t/which-node-to-use-to-communicate-lumel-nd30iot-with-epc-1502-via-mqtt/90816>\
**Category:** General\
**Created:** [9 September 2024 13:42 UTC](https://discourse.nodered.org/t/which-node-to-use-to-communicate-lumel-nd30iot-with-epc-1502-via-mqtt/90816 "2024-09-09T13:42:27Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![lumelnd30iot](https://avatars.discourse-cdn.com/v4/letter/l/c37758/32.png) [@lumelnd30iot](https://discourse.nodered.org/u/lumelnd30iot)\
**Post date:** [9 September 2024 13:42 UTC](https://discourse.nodered.org/t/which-node-to-use-to-communicate-lumel-nd30iot-with-epc-1502-via-mqtt/90816/1 "2024-09-09T13:42:27Z")

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Hi  
I want to communicate ND30IoT which is a meter with Phoenix contact PC "EPC 1502" via MQTT.

On EPC i have downloaded MQTT Mosqitto brocker. Later i connected MQTT out with in node successfully. But i have no idea on how to insert data from ND30.  
I used plc-write-variables with IP of ND30 but i won't connect.  
Any idea?

TIA 🙂  
 ![1](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/5/2/52352678cee69abaa68c5d4ad5becf374441dbfb.png)

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**Author:** ![hominidae](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/hominidae/32/4174_2.png) [@hominidae](https://discourse.nodered.org/u/hominidae)\
**Post date:** [9 September 2024 21:40 UTC](https://discourse.nodered.org/t/which-node-to-use-to-communicate-lumel-nd30iot-with-epc-1502-via-mqtt/90816/2 "2024-09-09T21:40:30Z")

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...not quite clear to me, what you want to achieve.  
According to this: [https://www.lumel.de/resources/Pliki%20do%20pobrania/ND30IoT/ND30IoT\_service\_manual.pdf](https://www.lumel.de/resources/Pliki%20do%20pobrania/ND30IoT/ND30IoT_service_manual.pdf) the ND30IoT will connect directly to the Broker on your EPC (if set up correctly), so using Node-Red as an intermediate is not required.  
In order to subscribe to data fom the ND30 via Node-Red, use the mqtt-in node and the appropriate topic to subscribe to.  
I suggest, that you make yourself familiar with how mqtt communication works and also inspect the topics in your Broker on your EPC with a more generic tool, like [MQTT Explorer](https://mqtt-explorer.com/).

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**Author:** ![system](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/1X/d073cd938eafa2e558d7c2cd59003b3ef4963033.png) [@system](https://discourse.nodered.org/u/system)\
**Post date:** [8 December 2024 21:40 UTC](https://discourse.nodered.org/t/which-node-to-use-to-communicate-lumel-nd30iot-with-epc-1502-via-mqtt/90816/3 "2024-12-08T21:40:56Z")

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