Hello guys,
I have a question for you. I have a game with 10 players. Every 250ms each player should send two byte lists to the other players. So that each player sends 2 lists every 250ms and receives 18 lists, which I then process. Can someone tell me the best way to do this? At first I thought it could be done with Networkvariable or NetworkList, but if I understood correctly, the server sets the variable all the time with this method and I don’t want that. RPC also seemed wrong somehow. What do you think would be the best way to do this? I am grateful for any help.
Define “best”. 
There are write permissions, you can change this from server to owner. Every player instance has its own NetworkList and it gets synchronized whenever a value inside the list changes. This is most likely what you need.
Why this frequency? What are you trying to accomplish?
Sending something at a fixed interval over the network ONLY makes sense to limit bandwidth because you know that the value(s) change far more frequently than four times per second but other clients only need to update their state at a much lower rate.
Note that each players list changes will not be received at the same time, nor will the received frequency be precisely 250 ms throughout the game due to latency.
If rate-limiting is the use case I would suggest to simply have a local List that you change during normal gameplay. You can then run a coroutine that applies the list values to the network list every 250 ms.
Thanks for your answer so I will give it a go with NetworkList . The reason for the 4 times per second is just to limit bandwith. Thats why my idea was to refresh with a coroutine every 250ms the lists. What i try to accomplish is a asynchron gameplay where every player has its own level/enemies on a small battleground. And every player sends the positions of their enemies to the other players, so that i can use this data to create a minimap for every player. So at the end every player can see his own battleground in the middle of the screen and left and right he can see the minimaps of the other players.