Latest questions about "message info"

It says received with the blue box outline, does this mean that I viewed it or the other person did?

Fail to connect to the device, please, check network and device. This is the message I get. Was it working until reset the router.

I see a message in a friend's status: "last online 2.55". Does this mean he just received a message at that time or he necessarily saw it or answered it?