Knowing when a device timeout occurs

Unfortunately, that is not possible with an incoming-only TELNET session (or with any incoming-only session, TELNET, TCP, COM, etc.). OmniServer will have to use Unsolicited Messages in order to talk to this type of device, and the problem is that OmniServer doesn't have a way to know if the remote connection is down or not if it's incoming only (i.e., Unsolicited Messages = Incoming Only). From OmniServer's point of view, it just merely waits for data to come in from the device, so it has no way of knowing if the device is down.