# Subscription of MQTT topic in MQTT broker(EDGEX) in ignition

**URL:** <https://forum.inductiveautomation.com/t/subscription-of-mqtt-topic-in-mqtt-broker-edgex-in-ignition/95317>\
**Category:** Ignition\
**Created:** [August 29, 2024, 1:14pm UTC](https://forum.inductiveautomation.com/t/subscription-of-mqtt-topic-in-mqtt-broker-edgex-in-ignition/95317 "2024-08-29T13:14:53Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![srinivasan\_s](https://avatars.discourse-cdn.com/v4/letter/s/eb9ed0/32.png) [@srinivasan\_s](https://forum.inductiveautomation.com/u/srinivasan_s)\
**Post date:** [August 29, 2024, 1:14pm UTC](https://forum.inductiveautomation.com/t/subscription-of-mqtt-topic-in-mqtt-broker-edgex-in-ignition/95317/1 "2024-08-29T13:14:53Z")

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I have a MQTT broker named.  
mqtt\_broker = "[broker.emqx.io](http://broker.emqx.io)"  
mqtt\_port = 1883 # Default port for MQTT  
mqtt\_topic = "petrus/modbus"  
In this broker, We have a topic and that topic is posting some values from the devices.

 ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/3/1/31c8565e7d639f9fba7cfc5ba508074e5950c00f.png)  
I need to subscribe that topic in ignition as tag.  
In ignition side:  
I have connected to the MQTT broker via MQTT engine.  
 ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/d/a/da0370ae06f5eb7c2b56180056e09c2ae909074b.png)

I was stuck, how to subscribe that topic from MQTT broker to our ignition.  
Kindly help me with this. Most of the online resources regards this topic is not much clear.

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**Author:** ![Kevin.Herron](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/kevin.herron/32/7259_2.png) [@Kevin.Herron](https://forum.inductiveautomation.com/u/Kevin.Herron)\
**Post date:** [August 29, 2024, 1:16pm UTC](https://forum.inductiveautomation.com/t/subscription-of-mqtt-topic-in-mqtt-broker-edgex-in-ignition/95317/2 "2024-08-29T13:16:34Z")

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[https://docs.chariot.io/display/CLD80/MQTT+Engine+Custom+Namespace](https://docs.chariot.io/display/CLD80/MQTT+Engine+Custom+Namespace)

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<div class="post-metadata">

**Author:** ![srinivasan\_s](https://avatars.discourse-cdn.com/v4/letter/s/eb9ed0/32.png) [@srinivasan\_s](https://forum.inductiveautomation.com/u/srinivasan_s)\
**Post date:** [August 30, 2024, 4:35am UTC](https://forum.inductiveautomation.com/t/subscription-of-mqtt-topic-in-mqtt-broker-edgex-in-ignition/95317/3 "2024-08-30T04:35:23Z")

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Thank you for reply @Kevin.Herron . We will work on it.