# Mqtt publishing from gateway script

**URL:** <https://forum.inductiveautomation.com/t/mqtt-publishing-from-gateway-script/49842>\
**Category:** Ignition\
**Tags:** ignition80\
**Created:** [August 12, 2021, 1:04pm UTC](https://forum.inductiveautomation.com/t/mqtt-publishing-from-gateway-script/49842 "2021-08-12T13:04:45Z")\
**Posts on this page:** 1\
**Showing post:** 2

<div class="post-metadata">

**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 12, 2021, 1:08pm UTC](https://forum.inductiveautomation.com/t/mqtt-publishing-from-gateway-script/49842/2 "2021-08-12T13:08:34Z")

</div>

The payload is supposed to be a byte array.

Try:

```python
publishing = system.cirruslink.engine.publish("SekuritKT","[MQTT Engine]Sekurit_KTBlower_Optimizer_write",jsonstring.encode(),2,1)

```

edit: this topic suggests it might be a little trickier than just using `.encode()`, not sure: [Publish to topics using system.cirruslink.engine.publish() - #2 by pturmel](https://forum.inductiveautomation.com/t/publish-to-topics-using-system-cirruslink-engine-publish/33993/2)

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