I need to create a USB-C coupler that connects two USB-C cables, passes the data from one to another while splitting out the USB 2.0 signal from the incoming USB-C plug to an additional receptacle or plug. It is sort of Y-type splitter.
As a first step, I'm trying to recreate a $5 USB-C coupler I'm using successfully to couple a Thunderbolt 3 connection. My current attempt connects all 24 USB-C pins of both connectors, starting with A1 on the first plug to A1 on the second plug and so on. It does not work, in which order do the pins from both plugs need to be connected?