How to use with Raspberry Pi and Waveshare SPI hat?

[Ken7382]

As the subject suggests - I have an RPi (3b+ in this case) and a Waveshare SPI hat that are working just fine. I can send/receive on it and connect to it via network address (from my phone.) I followed the setup routine listed and that went just fine, but when I choose "serial" then it doesn't see a serial port, and if I define one of the available ports:

It comes back with this error:

I've tried with just serial alone (tells me no serial ports detected) and with spidev0.0 as well as spidev0.1 define - neither of which work. However if I define TCP and give it 127.0.0.1 as the IP, it works perfect (but then I can't connect to it via my phone since it's an RPi and bluetooth doesn't work.)

Supposedly someone has done this but I'm not seeing what device/port I should be using, or am I supposed to use the IP address?

[sibrat]

meshmonitor provides virtual node server that support multiple simultatious tcp connections.