RPC calls

Learn remote calls with ClientRpc and ServerRpc.

Remote Procedure Calls (RPC)

An RPC (Remote Procedure Call) allows code running on one machine to trigger a function on a remote machine across the network. Games use RPCs to broadcast visual effects, audio cues, or instant announcements to all players.

// Invoked on server, executes across all connected clients
[ClientRpc]
public void RpcPlayExplosionEffect(Vector3 pos) {
    Instantiate(explosionPrefab, pos, Quaternion.identity);
}

In Mirror, calls made from server to clients are marked with the [ClientRpc] attribute and an Rpc prefix.

ServerRpc and Netcode for GameObjects

In Unity's official Netcode for GameObjects (NGO) framework, RPC calls are named explicitly: client-to-server calls are [ServerRpc], and server-to-client calls are [ClientRpc].

// In NGO convention, ServerRpc ends with a suffix
[ServerRpc]
public void SubmitScoreServerRpc(int score) {
    // Server records the score
}

This symmetric structure makes the direction of data flow explicit and easily auditable in code.

Exercise ClientRpc invocation flow

Define a Start method. Inside, print the text "Sunucudan tum istemcilere ClientRpc gonderildi" using Debug.Log.

Show example solution

using UnityEngine;

public class RpcController : MonoBehaviour
{
    void Start()
    {
        Debug.Log("Sunucudan tum istemcilere ClientRpc gonderildi");
    }
}

Test yourself

Which RPC type does the server use to trigger an explosion effect simultaneously across all connected clients?
- StaticRpc
- ClientRpc
- ServerRpc
- LocalRpc
Show answer

ClientRpc — To invoke remote functions from the server across all connected clients, ClientRpc is used.

Declare ClientRpc

[____] public void RpcPlayExplosion() {}

Show answer

[ClientRpc] public void RpcPlayExplosion() {}

RPC mechanisms

RPC

Call running a function remotely
ClientRpc

Call from server to all clients
ServerRpc

Request call sent from client to server
TargetRpc

Call from server to one chosen client

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