Multi-Level Wildcard - Covers Many Topic Levels; Mqtt Cluster - Black Box EME160A User Manual

CHAPTER 1: HEADLINE
CHAPTER 2: MQTT TOPICS

2.1.2 MULTI-LEVEL WILDCARD - COVERS MANY TOPIC LEVELS: #

A multi-level wildcard covers many topic levels. It only appears at the end of a topic string. Figure 2-3 illustrates a
multi-level wildcard.

2.2 MQTT CLUSTER

In an MQTT cluster, multiple brokers are handling the same topics.
If a broker receives new data from a sensor or device, it will distribute the new data between all other MQTT brokers
for redundancy using inter-node communication channels.
In the event of a broker failure or communications problem, which is called a netsplit event, the data remains
available from other cluster members.
If the failed cluster member comes online again, the sensor data missed during the offline period will be replicated
from the other nodes.
The subscribed client will get the same data and same topics from any of the brokers participating in the cluster.
The publisher device or sensor can publish its data to any of the brokers participating in the cluster, knowing that the
data will be replicated automatically to other brokers.
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FIGURE 2-3: MULTI-LEVEL WILDCARD
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