Thanks for the clarification.
Our agent doesn't have the capability to know about any other devices on your network because it doesn't have access to anything and is likely connected to a switch which doesn't allow devices to see each others traffic. It acts as just another connected item on your network.
However, it's what you don't see that can give you leads on what might be going on.
Check out this article which explains what the statuses are and I'll touch on it here as well;
Internet outages, alerts and agent statuses
The agent cannot monitor your modem or wireless signals but if you are seeing disconnections (Inactive) on a regular basis and if other devices on your network seem to lose Internet access, this might tell you something.
You can isolate these things as the agent will always report IP outages because this is something it can track. No matter how long the outage is, so long as the agent has power and is kept running, it will send its report as soon as it regains Internet access. If you don't see an outage report after being disconnected from the Internet, and especially if you were able to see the agent in 'Inactive' status (Using a mobile or another network), it very likely means the problem was not IP related but something else.
That could be anything from a bad cable to signal levels but if you know the problem is not IP outage related, it gives you a bit more to work with.
To know if these signal problems go beyond your own location, you could have a neighbor install and agent too and if you both see Inactive events around the same times, it tells you that it's more than likely the provider, something up the street and not your own location.
I hope this explanation make sense to you and is helpful.