[网络协议]UDP网络连接

创建Socket

private void GetSeverIp()
    {
        try
        {
            _socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
            _endPoint = new IPEndPoint(IPAddress.Any, _udpPort);
            //端口复用
            _socket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true);
            _socket.Bind(_endPoint);
            _data = new byte[1024];
            StartCoroutine("IeReceive");
        }
        catch (Exception e)

接收服务端的数据

WaitForEndOfFrame _waittime = new WaitForEndOfFrame();
    IEnumerator IeReceive()
    {
        while (!_isStop)
        {
            if (_socket.Available > 0)
            {
                int recv = _socket.ReceiveFrom(_data, 1024, SocketFlags.None, ref _endPoint);
                if (recv <= 0)
                {
                    continue;
                }
                string msg = Encoding.ASCII.GetString(_data, 0, recv);
                _receiveCallback?.Invoke(msg);
                isReceive = true;
            }
            yield return _waittime;
        }
    }

关闭Socket

private void OnCloseSocket()
    {
        StopCoroutine("IeReceive");
        _isStop = true;
        if (_socket !=null)
        {
            _socket.Close();
            _socket = null;
        }
    }

切换前后台是对socket 进行关闭和重新创建

  private void OnApplicationPause(bool isPause)
    {
        if (isPause)
        {
            OnCloseSocket();
        }
        else
        {
            GetSeverIp();
        }
    }