@Cliff365 Pretty straight-forward. I have Pi 4 connected to an Endpoint to connect 3.3V, Grd, SDA, SCL.
From Enpoint I have a short ethernet cable to the Midpoint then another short ethernet cable to my 2nd Endpoint.
The description and functionality on Sparkfun’s site made it sound more complicated than it was in real life,
The Endpoints and Midpoints each have QWIIC female plugs and with I2C you can daisy chain multiple sensors together. You just have to be mindful of the device addresses.
I’m using duplicate sensors for temperature, barometric pressure, humidity for Indoor vs Outdoor readings. 1 sensor captures all 3 readings but it also has a solderable jumper pad to resolve the address issue.
The purpose of the Sparkfun devices is to give you the ability to transmit I2C data over some pretty good distances. Like 100+ ft.
They explain how they get that amount of distance but way over my electronics hardware pay grade.