Orange pi 2g-iot as a Gateway Device

Not directly, you’d need at least Bluetooth 4.0 with Bluetooth Low Energy support at least with the normal ruuvitag firmware. On the other hand that device seems to have one usb host port, meaning you can plug a compatible usb ble dongle in it and it should work, at least from the hardware perspective. I don’t know about the software side of things regarding that board though.