SmartSDR Serial Passthrough - API Documentation

I don't think the API has been updated. There are only a few relevant ethernet API changes. First, setting a usb cable type to passthrough:

usb_cable set <serialNumber> type=passthrough

Then SmartSDR CAT interacts with the data by receiving base64 data (by default) from the USB Cable via status message from the radio:

usb_cable data:base64 <encoded string>

And sends data from the local virtual port to the radio:

usb_cable write <serialNumber> base64 <base64encodeddata>

Hopefully that answers your questions. We will get this updated in the API soon (logged in our system as SMART-11468).