Logon how ? (via RF packetised link)

From: Mike (nospam_at_nospam.com)
Date: 11/18/04 

Date: Thu, 18 Nov 2004 13:00:25 GMT

        I've got a system that has an RF device attached to ttyS1 which up
until now has been used for telemetry.

        So far, over this RF link I can request files, send files, extract
system performance info and force a reboot.

        To make the system more versatile I'd like to log on over this RF link.
Security is not an issue.

        The problem is, I don't understand how I can do it. If I do something
like getty where getty gets replaced by the login process, then I'm
going to loose the code that handles the packetised RF link.

        Am I going to have to make my packetised RF link a device driver or
are there other ways around this problem ?

Mike