[aprssig] APRStt (touchtone) lives

[John Langner WB2OSZ]

Here is a flexible APRStt implementation that can be customized for a wide
variety of situations just by changing the configuration file.


APRStt Implementation Notes 
https://github.com/wb2osz/direwolf/raw/master/doc/APRStt-Implementation-Note
s.pdf   

Very few hams have portable equipment for APRS but nearly everyone has a
handheld radio that can send DTMF tones. APRStt allows a user, equipped with
only DTMF (commonly known as Touch Tone) generation capability, to enter
information into the global APRS data network. This document explains how
the APRStt concept was implemented in the Dire Wolf application.


APRStt Interface for SARTrack 
https://github.com/wb2osz/direwolf/raw/master/doc/APRStt-interface-for-SARTr
ack.pdf 

This example illustrates how APRStt can be integrated with other
applications such as SARTrack, APRSISCE/32, YAAC, or Xastir.