Question

但至今为止我所找到的答案都无济于事。

Problem: I m trying to listen to a Velodyne HDL32 that sends its packets via UDP to my pc. The OS is 32-bit Ubuntu and Boost library v1.46.

我通过Wireshark获得的数据是这样的:

Time     | Source         | Destination   | Protocol | Length | Source Port | Destination Port
0.000000 | 192.168.17.212 | 192.168.3.255 | UDP      | 1248   | https       | opentable

但有了这个代码,我看不到任何数据(Port是正确的):

receiver(boost::asio::io_service& io_service,
  const boost::asio::ip::address& listen_address)
: m_socket(io_service)
{

boost::asio::ip::address ipAddr = boost::asio::ip::address_v4::any();
boost::asio::ip::udp::endpoint listen_endpoint(
         ipAddr, 2368);

m_socket.open(listen_endpoint.protocol());
m_socket.bind(listen_endpoint);

m_socket.async_receive_from(
    boost::asio::buffer(m_data, max_length), m_sender_endpoint,
    boost::bind(&receiver::handle_receive_from, this,
      boost::asio::placeholders::error,
      boost::asio::placeholders::bytes_transferred));
}

void handle_receive_from(const boost::system::error_code& error,
  size_t bytes_recvd)
{
std::cout << "receive" << bytes_recvd << std::endl;


  m_socket.async_receive_from(
      boost::asio::buffer(m_data, max_length), m_sender_endpoint,
      boost::bind(&receiver::handle_receive_from, this,
        boost::asio::placeholders::error,
        boost::asio::placeholders::bytes_transferred));
}

Can anyone identify a problem so far or do you need more information? I appreciate any help I can get.

NOTE: I m NOT running the program with root privileges!

Some thoughts: Could it be possible that boost::asio::ip::address_v4::any() won t listen to the IP ..*.255 when having subnetmask 255.255.255.0?

When using netcat, no data is shown as well. When I use Windows netcat it works quite fine. Same with Wireshark on Linux and Windows - works fine. Tried it with the as well, but with the same effect - no data.

Answer 1

谢谢大家帮我代码没问题但问题是在天线和网络的侧面

所有试图与威洛丁合作的其他人的解释如下:

The velodyne has it s own subnetwork (192.168.17.x). All recorded data is now send to the subnetwork 192.168.3.x by broadcast. Under normal circumstances the data should be received on all IPs in this subnet, but this seems not to be possible. The only IP you can receive data is the IP 255 and that just if you use one of these two solutions. (Or use windows or dump a file with wireshark)

< 强 > 1. 愚蠢的但可行的解决方案

设置192.168.3.1. 的网关。是的, 没有, 但并不重要。从现在开始, 您将收到IP 255 的数据。

<强 > 2. 清洁溶液

设置一条新的路线, 引导所有从 velodyne 子网到 192.168. 3.x 子网的交通。

我真的不知道为什么它如此融洽,但是我们花了相当长的时间才发现这个“秘密”。希望你们中的一些人能从我们这个虚伪的工作中获益。

Answer 2

你试过设置广播选项吗?

// do this before binding
boost::asio::socket_base::broadcast option(true);
m_socket.set_option(option);

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