Apologies, I’ve not been monitoring this thread.
A bit of an update from me; I did get the gateway to connect in the end. Although, I had to physically open the hub and solder pins to the headers to open port 9898 to allow the binding to connect. However, I did find the gateway would disconnect from time to time.
So i decided to look into Zigbee2mqtt, it is quite daunting at first when you look at the surface. But i assure you it’s quite straight-forward. I’m happy to help @banier if you want any information/help - just drop me a direct message 
I do feel its a better solution than the gateway in all honesty!