modemu2k (Hayes-style AT-command modem emulator)

modemu2k bridges a serial-style interface to a TCP or Telnet
endpoint. It ships as a C library (libmodemu2k) exposing the modem
state machine, plus a small CLI built on top that allocates a PTY
and either reads stdin/stdout directly, forks a comm program
(minicom, picocom) on the slave, or accepts an incoming TCP
connection as the TTY. IPv4 and IPv6 are supported.

modemu2k is based on modemu, originally developed by Toru Egashira.

Optional runtime helpers (not build-time requirements):

  * minicom -- terminal program invoked by the m2k-minicom helper
    script. In the stock Slackware package set.
  * picocom -- alternative terminal program for the m2k-picocom
    helper script. Available from SlackBuilds.org.
  * lrzsz -- for ZModem/YModem/XModem file transfers initiated from
    inside a comm program. In the stock Slackware package set.

No special configuration is needed before or after installing.

Build options:

  TEST=yes    Run `meson test` after building. Results are logged
              under /usr/doc/modemu2k-<version>/test_results.txt
              inside the package. Default: no.
