patty AX.25 stack

patty (packet TTY multiplexer) is a portable implementation of the AX.25 2.2 standard, able to run in userland on many POSIX-like operating systems. The software uses the KISS TNC protocol to communicate with hardware.

Features

Full support for AX.25 2.2 stateful connections
BSD sockets-like API for listening for, accepting, establishing, and creating connections
Separate BSD sockets-like API for sending/receiving Unnumbered Information (UI) datagrams
Supports one separate program per SSID (up to 16) to accept inbound connections
Supports thousands of concurrent inbound and outbound stateful connections
Able to multiplex a single KISS TNC to multiple software endpoints via BSD pseudoterminals
Allows APRS-IS connections to be used by software speaking the KISS TNC protocol

Example Use Cases

Use off-the-shelf BBS software without modification
Allow logins to a Unix shell
Use Xastir with APRS-IS
Create an APRS IGate

Releases

patty 0.1.0 — Released on 23 December 2024

Source Code

The source code for patty can be accessed here:

https://scm.xan.host/patty.git

Manual

Click here to read the online documentation.