I am looking for a way of getting a telnet connection to a device that will be connected to the internet via grps (and as such is not on a known address) The device end needs to be automated to the point that it can just be powered up.

ie the "remote end" needs to call the client end

Of course you can do the standard thing with netcat but that leaves me with the only security being the ip address the remote end contacts..security isn't a particular concern in this case but it would be nice to have a bit more than that.

Also the netcat way doesn't seem to well equipped to handle interactive prompts (for example top fails)

Is there a way of doing something similar but getting to a login prompt rather than a shell ?

I am sure there would be a way of doing it with an ssh tunnel but I was trying to avoid this as bandwidth may be at a premium, also the remote end is a tiny 100MHZ ETRAX processor with only a tiny bit of flash. So I was worried that the ssh overhead may become a problem.

Has anyone done anything similar or do they have any thoughts on a quick and easy way to accomplish this ?