GameClient.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using System;
using System.Net;
using System.Net.Sockets;

public class GameClient : MonoBehaviour
{

    [SerializeField]
    private string address;

    [SerializeField]
    private int port;

    [SerializeField]
    private GameObject objectToMove;

    private Socket socket;
    private IPEndPoint endPoint;

    // Start is called before the first frame update
    void Start()
    {
        socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
        socket.Blocking = false;
        endPoint = new IPEndPoint(IPAddress.Parse(address), port);
        // prepare and send the join packet
        byte[] joinPacket = new byte[1];
        joinPacket[0] = 0;
        socket.SendTo(joinPacket, endPoint);
    }

    // Update is called once per frame
    void Update()
    {
        DequeuePackets();
        UpdateVelocity();

    }

    void DequeuePackets()
    {
        byte[] receivedPacket = new byte[64];
        int rlen = 0;
        try
        {
            rlen = socket.Receive(receivedPacket);
            if (rlen != 13)
                return;
            // UPDATE LOCATION
            if (receivedPacket[0] == 2)
            {
                float x = BitConverter.ToSingle(receivedPacket, 1);
                float y = BitConverter.ToSingle(receivedPacket, 5);
                float z = BitConverter.ToSingle(receivedPacket, 9);
                objectToMove.transform.position = new Vector3(x, y, z);
            }
        }
        catch
        {
            return;
        }
    }

    void UpdateVelocity()
    {
        byte[] setVelocityPacket = new byte[13];
        setVelocityPacket[0] = 1;

        byte[] velocityX;
        byte[] velocityY;
        byte[] velocityZ;

        if (Input.GetKey(KeyCode.Space))
        {
            velocityX = BitConverter.GetBytes(0.0f);
            velocityY = BitConverter.GetBytes(0.0f);
            velocityZ = BitConverter.GetBytes(3.0f);
        }
        else
        {
            velocityX = BitConverter.GetBytes(0.0f);
            velocityY = BitConverter.GetBytes(0.0f);
            velocityZ = BitConverter.GetBytes(0.0f);
        }

        Buffer.BlockCopy(velocityX, 0, setVelocityPacket, 1, 4);
        Buffer.BlockCopy(velocityY, 0, setVelocityPacket, 5, 4);
        Buffer.BlockCopy(velocityZ, 0, setVelocityPacket, 9, 4);

        socket.SendTo(setVelocityPacket, endPoint);
    }
}