Ok, I have a similar story. I am replacing a quite old MacBook Pro with a 2016 MBP, which I reformatted and installed Mojave on, and then installed WeatherCat 3.0. I have a Vantage Pro2 with a USB data logger. WeatherCat does not seem to see the logger. The comms ports shown are /dev/cu.SOC, /dev/cu.mals, and /dev/cu.Bluetooth-incoming-Port. Though it is a USB logger, I installed the latest SL driver, which made no difference.
Googling /dev/cu.SOC and Mojave, I found a dev forum in which a poster explained that he solved a problem like this, communicating serial-usb with a dev board with a computer with Mojave, using the Apple USB/USB-C adapter. He solved the problem by using a direct USB-c to mini-USB cable. I bought one of these, but it made no difference.
Has anyone made this work with Mojave? I could reformat and install High Sierra. Is that working for anyone with a MBP with USB-C? Or is this a USB-C compatibility issue?
Any suggestions appreciated.