How do I Sync data from client to server?

Question

I'm trying to Sync data from the client to the server using the new Unity Networking, and I'm failing for some reason.

I've set up a prefab with a NetworkIdentity component with the attribute Local Player Authority set.

I (manually) spawn that on the server, and it is correctly propagated to the clients.

I have a couple of vars on this class, which the client sets and the server should read:

public class PlayerController : NetworkBehaviour
{
    [SyncVar] public bool engineOn;
    [SyncVar] public Quaternion lookAt;

The client correctly sets them, however the server never receives them, they always stay at the default value.

What might be happening?

Answer 1

[SyncVar] only sends messages from the server to the client. You need [Command].

Answer 2

Not sure if this has been figured out or but here goes. I dropped the [SyncVar] portion except for health and shields on players and used the following code to get by break lights to sync across network.

void LateUpdate () {

    if (isLocalPlayer) {
        if (Input.GetButton ("Fire1")) {
            breakLightsOnOff = true;
        } else {
            breakLightsOnOff = false;
        }
        CmdBLC (breakLightsOnOff);
    }
}

[Command]
void CmdBLC(bool OnOff) {
    RpcBreakLightControl (OnOff);
}

[ClientRpc]
void RpcBreakLightControl(bool OnOff) {
    breakLights.SetActive (OnOff);
}

Answer 3

The problem is that Server will never receive these updates unless there is a LocalClient on the machine running the server. Refer unity docs for the word Host i.e. Sever and a Client