July 2017
Beginner to intermediate
378 pages
10h 26m
English
Content preview from Analytics for the Internet of Things (IoT)
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
Start your free trial
Topics
Topics are hierarchical and are similar to a filing system. For example, vehicleID/engine/oil/temperature and vehicleID/engine/oil/pressure. An IoT device linked to a vehicle might publish a message that holds the value of 122.2 to the address called vehicleID/engine/oil/temperature (where vehicleID would be the unique identifier of that specific vehicle) on the broker. A subscriber to this topic would then get a message that includes the value 122.2 when it establishes a connection to the broker. If a constant connection to the broker is held, the subscriber will receive the message in near real time.
The concept of topic matching is supported for subscribers. This allows wildcard characters, + or #, to be used when subscribing to ...