Trying to figure out how to connect the serial gateway to a vera edge

[dualarrow]

I have a vera edge with mysensors installed. I have an arduino nano and an NRF24 connected as per the "Building a serial gateway" page descibed at https://www.mysensors.org/build/serial_gateway

If the arduino is connected to my PC I see info like the following in the serial monitor

0;255;3;0;9;MCO:BGN:INIT GW,CP=RNNGA--,VER=2.1.1
0;255;3;0;9;TSM:INIT
0;255;3;0;9;TSF:WUR:MS=0
0;255;3;0;9;TSM:INIT:TSP OK
0;255;3;0;9;TSM:INIT:GW MODE
0;255;3;0;9;TSM:READY:ID=0,PAR=0,DIS=0
0;255;3;0;9;MCO:REG:NOT NEEDED
0;255;3;0;14;Gateway startup complete.
0;255;0;0;18;2.1.1
0;255;3;0;9;MCO:BGN:STP
0;255;3;0;9;MCO:BGN:INIT OK,TSP=1

Apart from the power LED on the arduino, it looks like the green LED is probably flashing very fast as its about half brightness.

If I connect the usb port on the nano to the USB port on the vera then look in the vera under "apps/develop apps/serial port configuration" next to the save button is the message "Not available". Is this the correct wiring or am I missing something ?

I have tried power cycling the vera but that hasn't made any difference.

[dualarrow]

It seems to have eventually become recognised, but it took over an hour of just sitting there. I have no idea why it decided to start working.