Thank you, Peter. Sounds like two paths:
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Use MQTT Server as-is since its somewhat an aggregate of Broker, Client and Hub. Maybe least flexible but also easiest to configure.
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Use the MQTT Broker, Client and Hub with setup in that order. Also use only one Broker across multiple platforms (HA or Homey) using Client and Hub. on/with each. I am assuming this may be the most flexible but challenging setup/configuration.
I may try Using MQTT Server first to see if I can get a successful result.