The Cosy 131 Installation Guide says the @ LED means “Internet is configured on the eWON COSY” when it’s on.
What does that mean practically speaking? Has the eWON merely received a WAN IP address? Is it able to reach the Internet? Something else?
That LED explicitly means the eWON has received an IP address from the network. It technically is not indicative of a valid internet connection but it does mean that we were provided and have applied an address from the network.