The overall concept:
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How to setup your RPi4, out of the box, for MQTT in your house.
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How to hack a Particle.io (as an exemplar) to become an MQTT publisher to your local RPi4
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How to set up Home Assistant on your RPi4 so you have a nice web-based interface to look at all the local sensor values, do automations, turn on and off things, check the temp at the beach house, etc.
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The Sage step: How to get Sage credentials to publish our MQTT data into the community Sage Beehive
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Really dreaming: Do in-situ analysis in the edge node (RPi4 or Nano). So eventually we would want the full Sage Edge stack to run and process the MQTT data.