srecord noeq GazellePresenceListener(StefansOS_ConnectToServer connector) {
  new VarWithNotify<Int> userCount;
  settable bool verbose;
  
  void init {
    connector.onNewLine(line -> {
      new Matches m;
      if (swic(line, "gazellePresence:", m)) {
        userCount.set(parseInt(m.rest()));
        if (verbose) print("Gazelle presence count: " + get());
      }
    });
    
    connector.sub("gazellePresence");
  };
  
  Int get() { ret userCount!; }
}

Began life as a copy of #1034092