Great tutorial-series. But I had one large issue: When using the ms of the OS as a timestamp on the network messages I had my chracters jumping around for no reason even when they where not moved at all and the position did not change at all.
I could solve this by using a "handcounted" framenumber as a timestamp. I do not understand why it is like that but this is 100% reproducable for me.
Maybe this helps somebody else.