Hello not sure if you are still active or what but the below link may help i recently tried to make a gateway with a nano a failed like you guys have however after reading the below forum it turn out that you need to have a nano with a FTDI chipset for the gateway i went and bought one, they are a bit more expensive then the cheaper ones but I've plugged it in and tested it and it now it works fine i hope that it help
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RE: Vera - Can't create GW device with UI7 files