| What Port does MQTT Normally Use? |
| Can you use MQTT without a broker? |
| What Protocol does MQTT use? |
| Can multiple clients publish to the same topic? |
| Is is possible to know the identity of the client that published a message? |
| What happens to messages that get published to topics that no one subscribes to? |
| How can I find out what topics have been published? |
| Can I subscribe to a topic that no one is publishing to? |
| Are messages stored on the broker? |
| What are retained messages? |
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