ApsaraMQ for MQTT supports Will Message and Shared Subscription under MQTT 5.0. This topic describes the availability of these features and how to enable them on Professional Edition instances.
MQTT 5.0 features
ApsaraMQ for MQTT supports the following MQTT 5.0 features:
Will Message — A message that ApsaraMQ for MQTT delivers on behalf of a client when the client disconnects unexpectedly. For more information, see Will Message.
Shared Subscription — A subscription mode in which multiple clients share the messages delivered to a single topic subscription. For more information, see Shared Subscription.
Enablement
To use Will Message or Shared Subscription on an existing Professional Edition instance, submit a ticket to request activation on the target instance.