function ResetIP() {
    MasterServer.ipAddress = "127.0.0.1";
    MasterServer.port = 10002;
}

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
    void ResetIP() {
        MasterServer.ipAddress = "127.0.0.1";
        MasterServer.port = 10002;
    }
}

import UnityEngine
import System.Collections

class example(MonoBehaviour):

    def ResetIP():
        MasterServer.ipAddress = '127.0.0.1'
        MasterServer.port = 10002