# MQTT Transmission Question

**URL:** <https://forum.inductiveautomation.com/t/mqtt-transmission-question/63366>\
**Category:** Ignition\
**Created:** [August 23, 2022, 10:37pm UTC](https://forum.inductiveautomation.com/t/mqtt-transmission-question/63366 "2022-08-23T22:37:14Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![danieltalbot](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/danieltalbot/32/11201_2.png) [@danieltalbot](https://forum.inductiveautomation.com/u/danieltalbot)\
**Post date:** [August 23, 2022, 10:37pm UTC](https://forum.inductiveautomation.com/t/mqtt-transmission-question/63366/1 "2022-08-23T22:37:14Z")

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![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/f/d/fd4135b4c6fa2f4b869a9bf99c25dde7335c52cc.png)

I have Zigbee2MQTT publishing to the Cirrus Link MQTT Distributor. The MQTT Engine pulls the tags in just fine. But I haven’t figured out how to write back to the devices in my Zigbee network. It looks like the problem is that the Transmission module publishes all the topics under spBv1.0. Is there a way I can configure my transmission to publish to a different root topic?

Thanks,  
Daniel

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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 23, 2022, 10:43pm UTC](https://forum.inductiveautomation.com/t/mqtt-transmission-question/63366/2 "2022-08-23T22:43:23Z")

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If Zigbee2MQTT isn’t Sparkplug compatible then I think you need to be using a [custom namespace](https://docs.chariot.io/display/CLD80/MQTT+Engine+Custom+Namespace) and the [system.cirruslink.engine.publish](https://docs.chariot.io/display/CLD80/MQTT+Publishing+via+MQTT+Engine) scripting function.

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**Author:** ![danieltalbot](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/danieltalbot/32/11201_2.png) [@danieltalbot](https://forum.inductiveautomation.com/u/danieltalbot)\
**Post date:** [August 23, 2022, 10:45pm UTC](https://forum.inductiveautomation.com/t/mqtt-transmission-question/63366/3 "2022-08-23T22:45:40Z")

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I will give that a try but I think that should work! I am already using a custom namespace to pull in the tags. Thank you for the quick reply.