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I have NodeMcu which I wanted to work as MQTT node, and I will have 50 nodes which will connect to routers(total 3) where these routers are connected to the main router through LAN.

For a broker, I will use Rpi 3b+.

So can I use local MQTT broker? If not

  1. What should I do? a public MQTT broker?
  2. other better option?
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    you should be able to use a local MQTT broker – jsotola Mar 4 at 15:36
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    Why do you think you can't use your own local broker? – hardillb Mar 4 at 16:42

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