I wanted to turn a short USB-A-to-Micro USB/Lightning cable into one that has a USB-C plug on the host side (because I couldn't find such a thing for purchase). I chopped off the USB-A plug and replaced it with a solderable USB-C connector that I found on eBay. Variants of this connector seem to be common. When I replaced the old plug, I wired up GND, VBUS, an D-/D+.
Unfortunately it's not working and the vendor told me that the connectors only work on the target side:
The connector is not OTG pinout, it can not connect the host to target. The type-c end must be target end.
I'm not sure what OTG has to do with it, if anything.
The picture on that web site says "5.1K resistor", but when I measure it the resistor between CC1 and VBUS is actually 56K.
After a bit of research, it seems to me that the right fix is to remove the 56K resistor to VBUS and replace it with a 5.1K one to GND. In the little PCB attached to the connector and shown in the photo below, that means removing the resistor in the middle position and adding a 5.1K one in the currently empty position on the left. Does that sound right?
Update: Removing the 56k pull up and adding the 5.1k pull down resistor as described did make it work.