In response to the "flashing green LED " question:
Yes that’s normal behavior.
If there’s no traffic on your gateway for about 60s, the WebSocket(WS) connection to the network is dropped intentionally and the gateway will re-connect. During reconnection, the LED will flash green.
The reason for this to not have gateways actively connected to the network and taking up resources when there’s no traffic (since WS requires a persistent connection).