AWS IoT
Developer Guide

Message Broker for AWS IoT

The AWS IoT message broker makes it possible for clients to communicate with AWS IoT and for AWS IoT to communicate with clients. Clients send data by publishing a message on a topic. Clients receive messages by subscribing to a topic. When the message broker receives a message, it forwards the message to all clients subscribed to the topic.

The message broker maintains a list of all client sessions and the subscriptions for each session. When a message is published on a topic, the broker checks for sessions with subscriptions that map to the topic. The broker then forwards the published message to all sessions that have a currently connected client.

If your use case does not require AWS IoT, see AWS Messaging for information about other AWS messaging services that better fit your requirements.