AWS IoT Core now supports message queuing for MQTT shared subscriptions, helping to enable IoT applications to maintain message delivery reliability during network disruptions. When all the members of a shared subscription group are disconnected or cannot process the incoming message volume, the service automatically queues Quality of Service 1 (QoS1) messages on persistent sessions. Queued messages are automatically delivered when shared subscribers reconnect or when additional shared subscribers are added to the group. This process helps preserve critical data during connectivity challenges and peak loads..
The feature is fully compatible with both MQTT v3.1.1 and 5.0 clients, and is now available in all AWS Regions where AWS IoT Core is supported. Queued messages will be billed at the standard messaging rate; visit the pricing page for more information about message pricing and get started with the AWS IoT Core documentation for implementation details.
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Source: Amazon Web Services
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