A quite usable version. Tested with Twincat on the same machine and on a different machine in the network (wired and wireless). Tested on Windows, but Linux should be just fine (only tested compilation there).
To connect to localhost, leave the connect IP empty "" or use "127.0.0.1". To connect remotely, connect("a.b.c.d") will try to use "a.b.c.d.1.1" as target NetID. If that is not the case, you should call setTarget() first with the correct NetID.
Occasionally, when connecting from a remote machine, after a session with lots of reads/writes/notifications, it would fail to reconnect for some time. But then it works again.