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OpenMQTTGateway/docs/prerequisites/broker.md
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Broker

The broker will act as an intermediary between OpenMQTTGateway and your controller, it can be seen as a centralized hub at the heart of your automation system. It carry on messages following a publish / subscribe mechanism.

All the events or commands could pass by the broker.

There are many choices of brokers, here are some of the most popular:

This wikipedia list gives you more details about the different choices you have. This github list seems to be the most exhaustive ones. Here is also some ideas of criteria from HiveMQ.

Once your broker is installed it can be interesting to see the traffic passing to it and to publish data, so as to do that there are several tools available: