Automating the sharing of sensors and switches between HA's using MQTT Discovery and Statestream

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I think the problem might be that you have discovery on, on the master. (the HA that provides the sensors / switches to the slave) If you don’t want the master to populate any sensors / switches from mqtt config, then set discovery to false or set the discovery prefix to something different than the slave.

mqtt:
  broker: 192.168.2.180
  client_id: 1212
  discovery: true
  discovery_prefix: rpi3