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I am working on what may be thought of as a SCADA system for the garden and workshop. I prefer WiFi to be on the SBC (Pi Zero) or host computer that I can then connect to a multi-drop serial for interfacing the somewhat industrialized microcontrollers. To bootload, I have set up the multi-drop serial so it has a full duplex connection between the host and microcontroller and a half-duplex connection that can manage what is (or is not) connected to the full-duplex bus. This is done with a specific favor (Intersil) of RS-485 transceivers.