Simple Unity5 LAN game, server updating clients are not - unity3d

Question

I am making a simple LAN game to just get my bearings in Unity Networking. All it is supposed to do is when a player clicks on a square in a grid, it changes it blue. My issue is when the LAN Host clicks on a square, it only updates locally and doesn't update the clients. When the client clicks on a square, it updates locally and the LAN host gets updated, but other clients do not get updated. All of my grid pieces have a network identity attached to them
Any ideas?
Heres the code:
using UnityEngine;
using System.Collections;
using UnityEngine.Networking;
public class Player_Paint : NetworkBehaviour {
[SyncVar]GameObject syncGridPiece;
GameObject gridPiece;
void Update () {
Paint();
TransmitGridColours();
}
void Paint(){
if(isLocalPlayer && Input.GetMouseButtonDown(0)){
RaycastHit2D hit = Physics2D.Raycast(Camera.main.ScreenToWorldPoint(Input.mousePosition), Vector2.zero);
if(hit.collider != null){
print(GameObject.Find (hit.transform.name));
gridPiece = hit.collider.transform.gameObject;
gridPiece.GetComponent<SpriteRenderer>().color = Color.blue;
}
}
}
[Command]
void CmdProvideGridColourToServer(GameObject gridPiece){
if(gridPiece){
syncGridPiece = gridPiece;
syncGridPiece.GetComponent<SpriteRenderer>().color = Color.blue;
}
}
[Client]
void TransmitGridColours(){
if(isLocalPlayer){
CmdProvideGridColourToServer(gridPiece);
}
}
}

Answer 1

You need to add a hook to your syncGridPiece syncvar.
In the hook function set the color to blue, like you did in the Command.
The hook will be called on remote players.
Also I don't think you can use a GameOject as a syncvar.
You just need to send it's ID.
[SyncVar(hook=UpdateGridPiece)] int syncGridPiece
Maybe an RPC would be more adapted to what you want to do.
From what I understand syncGridPiece could be any square so you shouldn't pass all updates in the same message.
Just send that X players clicked X square with an RPC.
Look at the damage example : https://docs.unity3d.com/Manual/UNetActions.html

Answer 2

Figured it out. Had to use ClientRpc. Code below.
using UnityEngine;
using System.Collections;
using UnityEngine.Networking;
public class Player_Paint : NetworkBehaviour {
GameObject gridPiece;
void Start () {
}
// Update is called once per frame
void Update () {
Paint();
}
void Paint(){
if(isLocalPlayer && Input.GetMouseButtonDown(0)){
RaycastHit2D hit = Physics2D.Raycast(Camera.main.ScreenToWorldPoint(Input.mousePosition), Vector2.zero);
if(hit.collider != null){
print(GameObject.Find (hit.transform.name));
gridPiece = hit.collider.transform.gameObject;
print("SettingColor");
CmdProvideGridColourToServer(gridPiece,Color.blue);
}
}
}
[Command]
void CmdProvideGridColourToServer(GameObject gridPiece,Color color){
RpcTransmitGridColours(gridPiece,color);
}
[ClientRpc]
void RpcTransmitGridColours(GameObject gridPiece, Color color){
gridPiece.GetComponent<SpriteRenderer>().color = color;
}
}