MQTT 5 Essentials Part 06 - Shared Subscriptions

MQTT 5 Essentials Part 06 - Shared Subscriptions

What are Shared Subscription?

Shared Subscriptions are an MQTT v5 feature that allows MQTT clients to share the same subscription on the broker. This mechanism is sometimes called client load balancing, since the message load of a single topic is distributed across all subscribers within the shared group.

What syntax do Shared Subscriptions use?

Here is an example for the topic structure:

$share/GROUPID/TOPIC

1. The first part is the shared subscription identifier
2. The second part is the group identifier
3. The third part contains the actual topic

Use cases for Shared Subscriptions

A typical use case is client load balancing for MQTT clients that are unable to handle the message load on subscribed topics. For example, a client that wants to write data to a database can encounter a bottleneck when the writing rate to the database is slower than the message rate. To address this issue multiple clients can distribute the message load with Shared Subscription to ensure, each message is written immediately after it was received.

*** Chapters / Table of Contents ***
00:00 Introduction
00:14 Shared Subscriptions in MQTT5
00:33 Syntax of Using Shared Subscription in MQTT5
01:12 Use Cases for Shared Subscriptions in MQTT5
01:59 Announcing part 7 - Payload Format Description in MQTT5


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