# \#mqtt-engine **URL:** https://forum.cirrus-link.com/tag/mqtt-engine/2.md [Latest](https://forum.cirrus-link.com/latest.md) · [Categories](https://forum.cirrus-link.com/categories.md) · [Tags](https://forum.cirrus-link.com/tags.md) --- ## [MQTT Engine 4.0.35 — continuous rebirth loop, DDATA rejected with unbirthed metric name](https://forum.cirrus-link.com/t/mqtt-engine-4-0-35-continuous-rebirth-loop-ddata-rejected-with-unbirthed-metric-name/885)
**Author:** [@tyler\_jj](https://forum.cirrus-link.com/u/tyler_jj)\ **Replies:** 1\ **Last updated:** [September 22, 2026, 10:31pm UTC](https://forum.cirrus-link.com/t/mqtt-engine-4-0-35-continuous-rebirth-loop-ddata-rejected-with-unbirthed-metric-name/885 "2026-09-22T22:31:02Z")
MQTT Engine is stuck in a rebirth loop on a single Sparkplug edge node. Every ~11.6 seconds it rejects a DDATA message with a sequence number error, requests a rebirth, and the cycle repeats. It has never recovered on it… --- ## [MQTT Engine initial tag values](https://forum.cirrus-link.com/t/mqtt-engine-initial-tag-values/396)
**Author:** [@cjmurph](https://forum.cirrus-link.com/u/cjmurph)\ **Replies:** 8\ **Last updated:** [September 1, 2026, 9:58pm UTC](https://forum.cirrus-link.com/t/mqtt-engine-initial-tag-values/396 "2026-09-01T21:58:37Z")
Hi, I’ve recently updated my ignition instance to 8.1.30 from 8.0.16 and have installed the latest engine and transmission modules to match. I’m seeing some strange behaviour with the edge node tags in engine. The init… --- ## [MQTT Engine Historical Backfill and Reference Tags](https://forum.cirrus-link.com/t/mqtt-engine-historical-backfill-and-reference-tags/879)
**Author:** [@Ore.O](https://forum.cirrus-link.com/u/Ore.O)\ **Replies:** 2\ **Last updated:** [August 21, 2026, 10:47am UTC](https://forum.cirrus-link.com/t/mqtt-engine-historical-backfill-and-reference-tags/879 "2026-08-21T10:47:17Z")
Hi, I’m using MQTT Engine to receive Sparkplug B data from an edge device. The device doesn’t support the folder structure I need, so I created UDTs in Ignition using Reference Tags to organize the MQTT Engine tags. Re… --- ## [S&F historical replay loses data](https://forum.cirrus-link.com/t/s-f-historical-replay-loses-data/865)
**Author:** [@alex](https://forum.cirrus-link.com/u/alex)\ **Replies:** 2\ **Last updated:** [May 26, 2026, 3:04pm UTC](https://forum.cirrus-link.com/t/s-f-historical-replay-loses-data/865 "2026-05-26T15:04:23Z")
Hi! Im trying to setup store and forward (using docker as test environment) and im constantly getting constant “UnknownMetricException” after DBIRTH triggers. I was following documentation and for our architecture, “Wr… --- ## [Engine not appearing in designer. Nor tags](https://forum.cirrus-link.com/t/engine-not-appearing-in-designer-nor-tags/856)
**Author:** [@N5A](https://forum.cirrus-link.com/u/N5A)\ **Replies:** 3\ **Last updated:** [April 2, 2026, 9:22pm UTC](https://forum.cirrus-link.com/t/engine-not-appearing-in-designer-nor-tags/856 "2026-04-02T21:22:37Z")
I do not get the Engine tags folder nor tags in designer. Everything appears to be running. Although the 6000 tags is somewhat concerning as there are only roughly 15 devices in the mosquito broker currently.. I may have… --- ## [Architecture Guidance: Sparkplug B to UNS JSON — Cirrus Link Modules vs UNS-Only](https://forum.cirrus-link.com/t/architecture-guidance-sparkplug-b-to-uns-json-cirrus-link-modules-vs-uns-only/847)
**Author:** [@lbagoly](https://forum.cirrus-link.com/u/lbagoly)\ **Replies:** 1\ **Last updated:** [March 2, 2026, 9:10pm UTC](https://forum.cirrus-link.com/t/architecture-guidance-sparkplug-b-to-uns-json-cirrus-link-modules-vs-uns-only/847 "2026-03-02T21:10:45Z")
We are building an OT-to-cloud data pipeline for one of our clients from Ignition to Azure. Shopfloor data is published from Ignition using Sparkplug B / Protobuf, and the Azure-side consumers require JSON payloads on st… --- ## [MQTT Transmission History Store](https://forum.cirrus-link.com/t/mqtt-transmission-history-store/845)
**Author:** [@cata](https://forum.cirrus-link.com/u/cata)\ **Replies:** 1\ **Last updated:** [February 24, 2026, 4:18pm UTC](https://forum.cirrus-link.com/t/mqtt-transmission-history-store/845 "2026-02-24T16:18:01Z")
Hello, My use-case involves one IgnitionEdge PC which will collect data from one PLC and one IgnitionStandard PC which aggregates the data and makes graphs, reports etc. IgnitionEdge has the MQTT Transmission module a… --- ## [MQTT Engine / SparkplugB Namespaces](https://forum.cirrus-link.com/t/mqtt-engine-sparkplugb-namespaces/837)
**Author:** [@controlsfreek](https://forum.cirrus-link.com/u/controlsfreek)\ **Replies:** 14\ **Last updated:** [January 14, 2026, 9:14pm UTC](https://forum.cirrus-link.com/t/mqtt-engine-sparkplugb-namespaces/837 "2026-01-14T21:14:58Z")
I am working in a test environment, Ignition Maker 8.3.2, Cirrus MQTT Engine, EMQX MQTT broker. My data is not refreshing, and I am seeing the following in the logs: Indeed the MQTT Engine is publishing to both the … --- ## [Ignition 8.3.0 - Custom Namespace Thread Pool Size](https://forum.cirrus-link.com/t/ignition-8-3-0-custom-namespace-thread-pool-size/833)
**Author:** [@szcl](https://forum.cirrus-link.com/u/szcl)\ **Replies:** 0\ **Last updated:** [January 8, 2026, 7:28am UTC](https://forum.cirrus-link.com/t/ignition-8-3-0-custom-namespace-thread-pool-size/833 "2026-01-08T07:28:38Z")
Is there a way to reduce “Custom Namespace Thread Pool Size” as (I believe) it was possible in 8.1 ? Would it increase overall system performance in any way? I’m running short on memory with my gateway and looking f… --- ## [Referencing Sparkplug B tags goes to Bad\_Stale after a while](https://forum.cirrus-link.com/t/referencing-sparkplug-b-tags-goes-to-bad-stale-after-a-while/827)
**Author:** [@jasperlg](https://forum.cirrus-link.com/u/jasperlg)\ **Replies:** 1\ **Last updated:** [December 4, 2025, 1:22am UTC](https://forum.cirrus-link.com/t/referencing-sparkplug-b-tags-goes-to-bad-stale-after-a-while/827 "2025-12-04T01:22:01Z")
Hi all, We’re having an issue with reference tags, which are referencing Sparkplug B tags. The Sparkplug B tag did not change in over a month, so it’s older data. However, the quality is still good. However, when we tr… --- ## [S&F to expression tags](https://forum.cirrus-link.com/t/s-f-to-expression-tags/821)
**Author:** [@Fielies](https://forum.cirrus-link.com/u/Fielies)\ **Replies:** 4\ **Last updated:** [November 11, 2025, 2:58pm UTC](https://forum.cirrus-link.com/t/s-f-to-expression-tags/821 "2025-11-11T14:58:43Z")
Apologies if this has been asked before. I know that S&F can be propogated to reference tags. But what about expression tags? Especially cases where your expression might consists of multiple MQTT Edge tags? I quickly … --- ## [Changing JSON Payload](https://forum.cirrus-link.com/t/changing-json-payload/814)
**Author:** [@gregsachs](https://forum.cirrus-link.com/u/gregsachs)\ **Replies:** 3\ **Last updated:** [October 27, 2025, 2:39pm UTC](https://forum.cirrus-link.com/t/changing-json-payload/814 "2025-10-27T14:39:15Z")
I have a MQTT device that is publishing a a few topics, each with a changing JSON payload that really should represent different devices and values. The MQTT engine is not parsing this, but rather is showing a single i… --- ## [Ignition 8.3 Maker Edition MQTT Modules](https://forum.cirrus-link.com/t/ignition-8-3-maker-edition-mqtt-modules/812)
**Author:** [@skandia4444](https://forum.cirrus-link.com/u/skandia4444)\ **Replies:** 6\ **Last updated:** [October 15, 2025, 6:34pm UTC](https://forum.cirrus-link.com/t/ignition-8-3-maker-edition-mqtt-modules/812 "2025-10-15T18:34:35Z")
Are the Cirrus Link MQTT modules no longer useable in Maker Edition 8.3? I get the following message after upgrading and installing the V5.0.0 MQTT Engine and Distributor modules: com.inductiveautomation.ignition.common… --- ## [Ignition MQTT Issue: Increasing Threads Leading to Server Instability](https://forum.cirrus-link.com/t/ignition-mqtt-issue-increasing-threads-leading-to-server-instability/600)
**Author:** [@jasperlg](https://forum.cirrus-link.com/u/jasperlg)\ **Replies:** 3\ **Last updated:** [September 23, 2025, 8:19pm UTC](https://forum.cirrus-link.com/t/ignition-mqtt-issue-increasing-threads-leading-to-server-instability/600 "2025-09-23T20:19:49Z")
Hi everyone, I’m currently facing a significant issue with Ignition related to MQTT threads that are steadily increasing until my server becomes unstable. The issue seems to be tied to the MQTT engine creating more and … --- ## [UNS Tag Creation Nested Metrics](https://forum.cirrus-link.com/t/uns-tag-creation-nested-metrics/800)
**Author:** [@matt.sarcopski](https://forum.cirrus-link.com/u/matt.sarcopski)\ **Replies:** 6\ **Last updated:** [September 10, 2025, 1:12pm UTC](https://forum.cirrus-link.com/t/uns-tag-creation-nested-metrics/800 "2025-09-10T13:12:50Z")
Hello we are trying to use MQTT engine to ingest Sparkplug B data from an ALC WebCtrl system. Tag generation works fine when using the default tags option. But, the engine does not properly generate UNS tags. ALC seems t… --- ## [Store and Forward not working properly with Ignition causing cache in our edge devices and quarantined items in our main gateway](https://forum.cirrus-link.com/t/store-and-forward-not-working-properly-with-ignition-causing-cache-in-our-edge-devices-and-quarantined-items-in-our-main-gateway/535)
**Author:** [@theodorska](https://forum.cirrus-link.com/u/theodorska)\ **Replies:** 2\ **Last updated:** [September 5, 2025, 4:52am UTC](https://forum.cirrus-link.com/t/store-and-forward-not-working-properly-with-ignition-causing-cache-in-our-edge-devices-and-quarantined-items-in-our-main-gateway/535 "2025-09-05T04:52:33Z")
Hello, we have issues with store and forward. we are getting live data from our connected ignition edge devices. however, while they are connected it seems that the store and forward functionality builds up a massive ca… --- ## [MQTT Engine on Ignition 8.3 beta - Unable to add Namespace Server Set to Custom Namespace](https://forum.cirrus-link.com/t/mqtt-engine-on-ignition-8-3-beta-unable-to-add-namespace-server-set-to-custom-namespace/793)
**Author:** [@Schmick](https://forum.cirrus-link.com/u/Schmick)\ **Replies:** 5\ **Last updated:** [August 21, 2025, 10:59pm UTC](https://forum.cirrus-link.com/t/mqtt-engine-on-ignition-8-3-beta-unable-to-add-namespace-server-set-to-custom-namespace/793 "2025-08-21T22:59:40Z")
Encountering an error in MQTT Engine while evaluating Ignition v8.3. Running the most recent Ignition 8.3.0-beta4 with most recent MQTT Engine version 5.0.0-beta2. Unable to associate a Namespace Server Set to a Custom … --- ## [Propagation of Alarm TAG configurations](https://forum.cirrus-link.com/t/propagation-of-alarm-tag-configurations/791)
**Author:** [@Andres\_Rossi](https://forum.cirrus-link.com/u/Andres_Rossi)\ **Replies:** 10\ **Last updated:** [August 18, 2025, 4:41pm UTC](https://forum.cirrus-link.com/t/propagation-of-alarm-tag-configurations/791 "2025-08-18T16:41:03Z")
Hi, Is there any way to propagate a TAG’s alarm settings via MQTT to the Engine side? Transmitter side: Engine side (alarm configuration was lost): Regards, Andrés --- ## [Ignoring outbound command](https://forum.cirrus-link.com/t/ignoring-outbound-command/774)
**Author:** [@TimJ](https://forum.cirrus-link.com/u/TimJ)\ **Replies:** 3\ **Last updated:** [August 13, 2025, 8:11pm UTC](https://forum.cirrus-link.com/t/ignoring-outbound-command/774 "2025-08-13T20:11:30Z")
I’m testing a new MQTT Sparkplug B connection. While I’m able to read all tags, I am unable to write successfully. I’ve set the item in question to bi-directional and do not have the write-blocking settings in MQTT Eng… --- ## [MQTT Modules with Mosquitto and Godot Sim](https://forum.cirrus-link.com/t/mqtt-modules-with-mosquitto-and-godot-sim/780)
**Author:** [@yohhalley](https://forum.cirrus-link.com/u/yohhalley)\ **Replies:** 4\ **Last updated:** [July 24, 2025, 9:45am UTC](https://forum.cirrus-link.com/t/mqtt-modules-with-mosquitto-and-godot-sim/780 "2025-07-24T09:45:42Z")
Hello, I am fairly new to Ignition, MQTT, SparkPlugB and the Cirrus Link MQTT Modules, but can’t really get the results I want (yet). Here’s what I want to do: I have a simulator to send data from a videogame (Godot g… --- ## [Wrong payload tree at Engine is not building property after devide\_id an UDTInstance is found](https://forum.cirrus-link.com/t/wrong-payload-tree-at-engine-is-not-building-property-after-devide-id-an-udtinstance-is-found/778)
**Author:** [@JEspinMartin](https://forum.cirrus-link.com/u/JEspinMartin)\ **Replies:** 1\ **Last updated:** [July 7, 2025, 3:43pm UTC](https://forum.cirrus-link.com/t/wrong-payload-tree-at-engine-is-not-building-property-after-devide-id-an-udtinstance-is-found/778 "2025-07-07T15:43:44Z")
I’m using transmission from edge like: Transmitter Name true EDGE GSJ/TANQUE/AGUA001 Default G3/E3/D3 and the tags at edge are: img1 On the Engine Site. I expect to see something like this: img2 Instead I’m se… --- ## [UNS View: How to use it?](https://forum.cirrus-link.com/t/uns-view-how-to-use-it/632)
**Author:** [@jasperlg](https://forum.cirrus-link.com/u/jasperlg)\ **Replies:** 9\ **Last updated:** [July 1, 2025, 5:34am UTC](https://forum.cirrus-link.com/t/uns-view-how-to-use-it/632 "2025-07-01T05:34:30Z")
Hi Guys, I saw the announcement on ICC, very exciting stuff! Alarm management on the edge is legend. Auto-converting to a uns flat MQTT version is legend. So great stuff! I’m just wondering a few things. On stage, th… --- ## [UDT filter folders](https://forum.cirrus-link.com/t/udt-filter-folders/770)
**Author:** [@mat](https://forum.cirrus-link.com/u/mat)\ **Replies:** 1\ **Last updated:** [June 25, 2025, 4:02pm UTC](https://forum.cirrus-link.com/t/udt-filter-folders/770 "2025-06-25T16:02:21Z")
Hi everyone! I’m publishing UDT definitions and I’m wondering how to filter specific folders within the UDT. The transmitter module sends this information: However, I would like to send only the Status folder. Is t… --- ## [MQTT Transmission module with store and forward](https://forum.cirrus-link.com/t/mqtt-transmission-module-with-store-and-forward/699)
**Author:** [@MBjerglund](https://forum.cirrus-link.com/u/MBjerglund)\ **Replies:** 1\ **Last updated:** [June 15, 2025, 9:25pm UTC](https://forum.cirrus-link.com/t/mqtt-transmission-module-with-store-and-forward/699 "2025-06-15T21:25:27Z")
Hi, I am testing the MQTT Transmission modules capabilities with the Store and forward. I have an Ignition Edge Gateway setup to publish data to the MQTT Distributor on a Ignition Standard Gateway. Here I am subscribin… --- ## [Transmission/Engine module: where to find keystore](https://forum.cirrus-link.com/t/transmission-engine-module-where-to-find-keystore/759)
**Author:** [@mateo.duren](https://forum.cirrus-link.com/u/mateo.duren)\ **Replies:** 4\ **Last updated:** [June 9, 2025, 12:55pm UTC](https://forum.cirrus-link.com/t/transmission-engine-module-where-to-find-keystore/759 "2025-06-09T12:55:48Z")
Hi all, we are working on an Ignition (8.1.48) implementation on OpenShift (Kubernetes) with the integration of the 4.0.29 modules. We base the implementation on the icc2023-ignition-k8s project. For the implementation… --- ## [Invalid tag at Path](https://forum.cirrus-link.com/t/invalid-tag-at-path/755)
**Author:** [@stef](https://forum.cirrus-link.com/u/stef)\ **Replies:** 4\ **Last updated:** [May 30, 2025, 6:19pm UTC](https://forum.cirrus-link.com/t/invalid-tag-at-path/755 "2025-05-30T18:19:25Z")
I’m running Ignition Maker edition(8.1.48) and the MQTT Engine v4.0.29 (b2025041017). I have EMQX running as my broker and its is publishing some system related data. For these system topics I keep getting an error in … --- ## [Multi Node redundancy](https://forum.cirrus-link.com/t/multi-node-redundancy/749)
**Author:** [@afthabvp](https://forum.cirrus-link.com/u/afthabvp)\ **Replies:** 7\ **Last updated:** [May 28, 2025, 3:23pm UTC](https://forum.cirrus-link.com/t/multi-node-redundancy/749 "2025-05-28T15:23:06Z")
Hi, I have two sets of redundant Ignition servers at the regional level, each collecting data from the same field devices (as part of disaster recovery measures). I’d like to configure MQTT on all four of these servers … --- ## [MQTT Engine enabled property](https://forum.cirrus-link.com/t/mqtt-engine-enabled-property/747)
**Author:** [@Josef](https://forum.cirrus-link.com/u/Josef)\ **Replies:** 3\ **Last updated:** [May 12, 2025, 3:29pm UTC](https://forum.cirrus-link.com/t/mqtt-engine-enabled-property/747 "2025-05-12T15:29:14Z")
Hi, I’m having trouble with the enable property in MQTT Engine. I’m using a python application that publishes UDTs in the NBIRTH message. Most tags in the UDTs are enabled: False. When the app publishes a DBIRTH messag… --- ## [MQTT Engine connecting to RabbitMQ](https://forum.cirrus-link.com/t/mqtt-engine-connecting-to-rabbitmq/741)
**Author:** [@kmccoy](https://forum.cirrus-link.com/u/kmccoy)\ **Replies:** 4\ **Last updated:** [May 3, 2025, 1:05am UTC](https://forum.cirrus-link.com/t/mqtt-engine-connecting-to-rabbitmq/741 "2025-05-03T01:05:04Z")
Has anyone connected to rabbitMQ? I have added the server and the server shows as connected, however no subscriptions are ever created. and thus no devices or tags. any advice would be much appreciated --- ## [Alarm Event Propagation](https://forum.cirrus-link.com/t/alarm-event-propagation/742)
**Author:** [@devereaux422](https://forum.cirrus-link.com/u/devereaux422)\ **Replies:** 3\ **Last updated:** [May 1, 2025, 4:05pm UTC](https://forum.cirrus-link.com/t/alarm-event-propagation/742 "2025-05-01T16:05:34Z")
I’ve been working on a project utilizing the ignition mqtt modules and during commissioning and development we have noticed a bug that happens around alarms that are being triggered and cleared quickly within the transmi… [Next page](https://forum.cirrus-link.com/tag/mqtt-engine/2.md?match_all_tags=true&page=1&tags%5B%5D=mqtt-engine)