需要一个 UDP 客户端示例

Question

我有一个Sail Timer wind vane that transmits data via UDP over a WiFi network created by the wind vane hardware. The system works fine, and I can read the data via 3rd party INavX navigation software。但是我想通过 PHP 直接读取 UDP 流进行测试，我无法让我的脚本到运行。我以前没有使用 UDP 的经验。

我知道硬件和网络工作正常，因为上述软件工作正常。另外，我可以在 wireshark 中看到网络流量。我试着向供应商寻求帮助，但他们说他们正在逐步淘汰我的模型，他们不会帮助我使用我现有的模型，我应该买一个新的。但是写导航软件的人说这是一个简单的网络连接，没有启动字符串或任何东西，"Just connect to the port and you should see data."

这与我见过的其他 UDP 示例有点不同的是，这本质上是 "listen only"（广播是什么？）。如果我尝试将数据写入套接字，我会收到 "permission denied" 错误，这就是我在 socket_recvfrom 函数中指定 ip 和端口的原因。

这是我在 PHP 中的客户端代码：

<?php

# based on from http://www.binarytides.com/udp-socket-programming-in-php/

/*
    Simple php udp socket client
*/

//Reduce errors
error_reporting(~E_WARNING);

// network settings for the wind vane
$server = '255.255.255.255';
$port = 55554;
if( isset($argv[1]) ) $server = $argv[1];
if( isset($argv[2]) ) $port   = $argv[2];

if(!($sock = socket_create(AF_INET, SOCK_DGRAM, SOL_UDP)))
{
    $errorcode = socket_last_error();
    $errormsg = socket_strerror($errorcode);

    die("Couldn't create socket: [$errorcode] $errormsg \n");
}



echo "Socket created \n";

// Bind the source address
if( !socket_bind($sock, "127.0.0.1" , 55554) )
{
    $errorcode = socket_last_error();
    $errormsg = socket_strerror($errorcode);

    die("Could not bind socket : [$errorcode] $errormsg \n");
}


//Communication loop
while(1)
{

    //Now receive reply from server and print it
    if( ($bytesRead = socket_recvfrom ( $sock , $reply , 2045 , 0 , $server, $port )) === FALSE)
    {
        $errorcode = socket_last_error();
        $errormsg = socket_strerror($errorcode);

    if( ! in_array($errorcode, array(35) ) )
      die("Could not receive data: [$errorcode] $errormsg \n");
    }

    if( $bytesRead > 0 ) {
      echo "Reply : $reply";
    }
    usleep(500000);
}

Answer 1

试一试：

//Create socket.
$socket = socket_create(AF_INET, SOCK_DGRAM, SOL_UDP);
if (!$socket) { die("socket_create failed.\n"); }

//Set socket options.
socket_set_nonblock($socket);
socket_set_option($socket, SOL_SOCKET, SO_BROADCAST, 1);
socket_set_option($socket, SOL_SOCKET, SO_REUSEADDR, 1);
if (defined('SO_REUSEPORT'))
    socket_set_option($socket, SOL_SOCKET, SO_REUSEPORT, 1);

//Bind to any address & port 55554.
if(!socket_bind($socket, '0.0.0.0', 55554))
    die("socket_bind failed.\n");

//Wait for data.
$read = array($socket); $write = NULL; $except = NULL;
while(socket_select($read, $write, $except, NULL)) {

    //Read received packets with a maximum size of 5120 bytes.
    while(is_string($data = socket_read($socket, 5120))) {
        echo $data;
    }

}

Answer 2

以上场景对我不起作用，总是伴随着无效协议某种错误：

虽然这很好用：

C++ 接收器：

unlink("/tmp/mysock");
socklen_t address_length = sizeof(struct sockaddr_un);
int_socket_fd = socket(AF_UNIX, SOCK_DGRAM, 0);
if(_socket_fd<=0){
    perror("socket error socket()");
    return false;
}
struct sockaddr_un server_address = {0};
server_address.sun_family = AF_UNIX;
strcpy(server_address.sun_path, "/tmp/mysock");
if(bind(_socket_fd, (const struct sockaddr *) &server_address, 
        sizeof(server_address)) < 0)
{
    perror("bind ()");
    close(_socket_fd);
    _socket_fd=0;
    return false;
}
system("chmod 777 /tmp/mysock");

PHP: 发件人

$sock = socket_create (AF_UNIX, SOCK_DGRAM, 0 );//
if($sock!=null)
{
    socket_sendto($sock, "ls\n", 3, 0, "/tmpmysock", 0);
    fclose($sock);
}

需要一个 UDP 客户端示例

Need a UDP client example

php

udp