C# primitives

C# primitive types are serialized by built-in serialization code. These types include bool, char, sbyte, byte, short, ushort, int, uint, long, ulong, float, double, and string.

You can also serialize arrays of C# primitive types, with the exception of arrays of strings (string[]) for performance reasons.

[Rpc(SendTo.Server)]
void FooServerRpc(int somenumber, string sometext) { /* ... */ }

void Update()
{
    if (Input.GetKeyDown(KeyCode.P))
    {
        FooServerRpc(Time.frameCount, "hello, world"); // Client -> Server
    }
}