October 2019
Intermediate to advanced
350 pages
9h 5m
English
Content preview from Hands-On Internet of Things with MQTT
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Exploring MQTT features
In this section, we will have a closer look at some important features of MQTT:
- QoS: For message buffering (when offline).
- Last will/testament: To let the network know when a device goes offline; for example, due to empty batteries.
- Keep alive: To define how often each device needs to call back home to let the MQTT server know that it is still online.
- Persistent sessions: To store various information on the MQTT server, while the client is offline.
- Retained messages: To keep messages available for new subscribers.
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