First Durable Queue

Last Updated: 2026-02-05

Durable queues use the $queue/ topic prefix. The broker stores the message in the queue log and delivers it to consumers in a group.

1. Publish to a Queue

mosquitto_pub -p 1883 -t "$queue/orders" -m "order-1" -q 1

2. Consume with a Consumer Group

Choose a client that can set a consumer group:

• MQTT v5: set the consumer-group user property on SUBSCRIBE.
• AMQP 1.0: set consumer-group in attach properties.
• AMQP 0.9.1: set x-consumer-group on basic.consume.

3. Acknowledge

Acks are required for durable queues. For MQTT v5, publish to:

• $queue/<queue>/$ack
• $queue/<queue>/$nack
• $queue/<queue>/$reject

Include message-id and group-id as user properties.

Next Steps

• Durable queues
• Consumer groups