# MQTT Engine value not updating

**URL:** <https://forum.inductiveautomation.com/t/mqtt-engine-value-not-updating/114913>\
**Category:** General Discussion\
**Tags:** perspective\
**Created:** [April 7, 2026, 7:50am UTC](https://forum.inductiveautomation.com/t/mqtt-engine-value-not-updating/114913 "2026-04-07T07:50:59Z")\
**Posts on this page:** 1\
**Showing post:** 1

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**Author:** ![xinru.tey](https://avatars.discourse-cdn.com/v4/letter/x/7ba0ec/32.png) [@xinru.tey](https://forum.inductiveautomation.com/u/xinru.tey)\
**Post date:** [April 7, 2026, 7:51am UTC](https://forum.inductiveautomation.com/t/mqtt-engine-value-not-updating/114913/1 "2026-04-07T07:51:00Z")

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The client side consists of Ignition Edge running inside APE with MQTT Transmission enabled.

On the server side, there is an Ignition Server with MQTT Engine and MQTT Distributor / Broker.

When a value is changed from Perspective on the server, the value is written to MQTT Engine. MQTT Engine then publishes the updated value through the MQTT Distributor / Broker. The client-side Ignition Edge receives the updated value through MQTT Transmission and updates the local Edge tags or PLC values.

The communication also works in reverse. When a value changes on the client side, Ignition Edge MQTT Transmission publishes the value to the MQTT Distributor / Broker, and MQTT Engine on the server receives and updates the corresponding server tag.

For now, the MQTT client receives the change correctly, but the MQTT Engine tag remains unchanged. if I restart the tag or manually change the tag value, it starts functioning normally again.

How to solve it?

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