October 2019
Intermediate to advanced
350 pages
9h 5m
English
Content preview from Hands-On Internet of Things with MQTT
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QoS 2 – exactly once
If dealing with duplicate messages is not an option, and you want to make sure that you receive messages on the client, even if it was offline for some time, then QoS 2 can be used. The downside of this is that it uses more resources than QoS 0 and QoS 1, and should, therefore, be used with care. Under the hood, more messages need to be sent to make sure published messages are delivered only once and that the subscriber receives the message, even if it was offline for some time.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.