Publish events from Event Grid Topics to Event Grid Topic Spaces

Question

Publish events from Event Grid Topics to Event Grid Topic Spaces

BV 20

Is it possible to publish/forward events received on Event Grid Topics (Namespace or Custom) to Event Grid Topic Spaces (MQTT Broker)? Please can you point to me to the documentation?

Praveen Kumar Gudipudi 1,880 Reputation points Moderator

2025-06-27T07:25:31.1533333+00:00

Hello BV,Could you please check Forward events from one Azure Event Grid namespace topic to another namespace topic

https://learn.microsoft.com/en-us/azure/event-grid/forward-events-to-another-namespace-topic

documents and let us know with an update.
BV 20 Reputation points

2025-06-27T08:19:14.8933333+00:00

Thank you. But, it only allows forwarding to Topics and not Topic Spaces
BV 20 Reputation points

2025-06-27T08:22:20.51+00:00

I think forwarding messages from Topics to Topic Spaces (reverse of routing) is not available. It would be good to understand if this is on the roadmap of Event Grid Namespace

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Praveen Kumar Gudipudi 1,880 Reputation points Moderator

2025-06-27T07:25:31.1533333+00:00

Hello BV,Could you please check Forward events from one Azure Event Grid namespace topic to another namespace topic

https://learn.microsoft.com/en-us/azure/event-grid/forward-events-to-another-namespace-topic

documents and let us know with an update.
BV 20 Reputation points

2025-06-27T08:19:14.8933333+00:00

Thank you. But, it only allows forwarding to Topics and not Topic Spaces
BV 20 Reputation points

2025-06-27T08:22:20.51+00:00

I think forwarding messages from Topics to Topic Spaces (reverse of routing) is not available. It would be good to understand if this is on the roadmap of Event Grid Namespace

Answer 1

Hello , Welcome to MS Q&A

Yes, Azure Event Grid does support forwarding events from Event Grid Topics (Namespace or Custom) to Topic Spaces in the MQTT broker feature, but with some architectural considerations.

To publish or forward events received on Event Grid Topics to Event Grid Topic Spaces (MQTT Broker), you can utilize Azure Event Grid's MQTT broker feature. This feature supports messaging using the MQTT protocol, allowing clients to publish and subscribe to MQTT messages over flexible hierarchical topics.

Here are some useful resources to get you started:

Quickstart: Publish and subscribe to MQTT messages on an Event Grid namespace with the Azure CLI: This guide helps you create an Event Grid namespace with the MQTT broker enabled, create subresources like clients and topic spaces, and grant access to publish and subscribe to topic spaces. Read more here.
Topic Spaces in Azure Event Grid’s MQTT broker feature: This document explains how topic spaces represent multiple topics through a set of topic templates, simplifying access control management. Learn more here.

Pls check and let me know if any further ques

Thanks

Deepanshu

BV 20 Reputation points

2025-06-24T10:04:04.6633333+00:00

Thanks for the reply.
My original question was "is it possible to forward events from Event Grid Topics to Topic Spaces in the MQTT broker?" i.e publish messages received on Topic (HTTP endpoint ) to Topic Space (MQTT endpoint).

Unfortunately it is not clear in the documentation links that you've provided how this can be achieved. (Apologies if I am not able to locate the documentation, please can you point me to the specific page?)

Since, you've said this is possible. Does Event Grid support this out-of-the box? I see Namespace Topics only support Push delivery to Event Hubs and Webhooks via Subscriptions.

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Publish events from Event Grid Topics to Event Grid Topic Spaces

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