使用 boost::asio 在同一主机上多播消息
我正在实现发送器/接收器应用程序以在同一主机上进行多播通话。
在我的构造函数中,我有以下代码来设置套接字。
boost::asio::ip::udp::endpoint listenEndpoint(listenAddr, mcastPort);
m_socket.open(listenEndpoint.protocol());
m_socket.set_option(boost::asio::ip::udp::socket::reuse_address(true));
m_socket.set_option(boost::asio::ip::multicast::enable_loopback(true));
m_socket.set_option(boost::asio::ip::multicast::hops(1));
m_socket.bind(listenEndpoint);
// Join the multicast group
m_socket.set_option(boost::asio::ip::multicast::join_group(mcastAddr));
m_socket.async_receive_from(boost::asio::buffer(m_data, MAX_PTP_MSG_LENGTH),
m_senderEndpoint, boost::bind(&PtpIpc::HandleReceiveFrom, this,
boost::asio::placeholders::error,
boost::asio::placeholders::bytes_transferred));
其中listenAddr是0.0.0.0。
我的发送方法代码如下:
m_socket.async_send_to(boost::asio::buffer(data, size), m_remoteEndpoint,
boost::bind(&PtpIpc::HandleSendTo, this,
boost::asio::placeholders::error,
boost::asio::placeholders::bytes_transferred));
其中 m_remoteEndpoint 是多播地址 224.0.1.129 和多播端口 320。
当应用程序 A 和应用程序 B 位于同一主机上时,应用程序 A 似乎没有从应用程序 B 接收多播消息,反之亦然。但是,如果我将应用程序 B 移动到同一子网上的另一台计算机...那么应用程序 A 会听到多播消息并回复应用程序 B,应用程序 B 也可以接收来自应用程序 A 的回复消息。我已启用环回并设置套接字reuse_address 选项。我缺少什么?
I'm implementing sender/receiver applications to talk multicast on the same host.
In my constructor, I have the following code to setup the socket.
boost::asio::ip::udp::endpoint listenEndpoint(listenAddr, mcastPort);
m_socket.open(listenEndpoint.protocol());
m_socket.set_option(boost::asio::ip::udp::socket::reuse_address(true));
m_socket.set_option(boost::asio::ip::multicast::enable_loopback(true));
m_socket.set_option(boost::asio::ip::multicast::hops(1));
m_socket.bind(listenEndpoint);
// Join the multicast group
m_socket.set_option(boost::asio::ip::multicast::join_group(mcastAddr));
m_socket.async_receive_from(boost::asio::buffer(m_data, MAX_PTP_MSG_LENGTH),
m_senderEndpoint, boost::bind(&PtpIpc::HandleReceiveFrom, this,
boost::asio::placeholders::error,
boost::asio::placeholders::bytes_transferred));
Where listenAddr is 0.0.0.0.
My sending method code is as follows:
m_socket.async_send_to(boost::asio::buffer(data, size), m_remoteEndpoint,
boost::bind(&PtpIpc::HandleSendTo, this,
boost::asio::placeholders::error,
boost::asio::placeholders::bytes_transferred));
Where m_remoteEndpoint is multicast address 224.0.1.129 and muticast port 320.
Application A doesn't seem to receive multicast messages from Application B and vice versa when both are on the same host. But if I move Application B to another machine on the same subnet... then Application A hears multicast message and reply back to Application B, which can also receive the reply message from Application A. I've enabled loopback and also set the socket reuse_address option. What am I missing?
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删除环回选项后会发生什么。我遇到了类似的问题并删除它修复了它。
What happens when you remove the loopback option. I've had a similar issue and removing that fixed it.