PHP implements hardware control

This article mainly introduces PHP's methods of connecting devices, communicating and sending commands, and involves PHP's related skills in device connection and data communication based on sockets. It has certain reference value. I hope to be helpful.

The details are as follows:

The BS architecture software (PHP) developed needs to communicate with the device. I will record it here and welcome your corrections:

1. Using PHP Socket technology uses TCP/IP to connect devices

Parameter $service_port connection port
Parameter $address Send IP address
Parameter $in Send command

function Send_socket_connect($service_port, $address, $in) {
//创建 TCP/IP socket$socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP) or die("could not create socket!");
  //设置超时时间
  $timeout = 2;
  $time = time();
  //设置非阻塞模式
  @socket_set_nonblock($socket);
  //超时判断
  while (!@socket_connect($socket, $address, $service_port)) {
    $err = socket_last_error($socket);
    // 连接成功，跳出循环
    if ($err === 10056) {
      break;
    }
    //连接失败，判断超时时间，停止
    if ((time() - $time) >= $timeout) {
      socket_close($socket);
      print('网络异常，请检查网络连接！！');
      exit();
    }
    // 刷新频率（250毫秒）
    usleep(250000);
  }
  //设置阻塞模式
  @socket_set_block($socket);
  //发送命令到设备
  socket_write($socket, $in, strlen($in));
  //关闭连接
  socket_close($socket);
}

Send_socker_xdcoder $buffer is the return value

function Send_socket_xdcoder($service_port, $address, $in) {
  //创建 TCP/IP socket
  $socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP) or die("could not create socket!");
  //设置超时时间
  $timeout = 2;
  $time = time();
  //设置非阻塞模式
  @socket_set_nonblock($socket);
  //超时判断
  while (!@socket_connect($socket, $address, $service_port)) {
    $err = socket_last_error($socket);
    // 连接成功
    if ($err === 10056) {
      break;
    }
    //连接失败，判断超时时间，停止
    if ((time() - $time) >= $timeout) {
      socket_close($socket);
      echo "<script>alert(&#39;网络异常，请检查网络连接！！&#39;);</script>";
      exit();
    }
    // 刷新频率（250毫秒）
    usleep(250000);
  }
  //设置阻塞模式
  @socket_set_block($socket);
  //发送命令到设备
  socket_write($socket, $in, strlen($in));
  //接收设备命令返回数据
  $buffer = socket_read($socket, 1024, PHP_NORMAL_READ);
  //关闭连接
  socket_close($socket);
  //输出返回值
  return $buffer;
}

2. Use php socket technology to connect the device using UDP protocol to implement communication and send commands

Parameter $service_port connection port
Parameter $address Send IP address
Parameter $in Send Command

function Send_socket_connect_udp($service_port, $address, $in) {
  //采用php socket技术使用UDP协议连接设备
  $socket = socket_create(AF_INET, SOCK_DGRAM, SOL_UDP);
  @socket_set_option($socket, SOL_SOCKET, SO_RCVTIMEO, array("sec" => 2, "usec" => 0));
  //发送命令
  @socket_sendto($socket, $in, strlen($in), 0, $address, $service_port);
  @socket_recvfrom($socket, $buffer, 1024, MSG_WAITALL, $address, $service_port);
  //关闭连接
  if (empty($buffer)) {
    echo "<script>alert(&#39;网络异常，请检查网络连接！！&#39;);</script>";
  }
}

Send_socket_xdcoder_udp $buffer is the return value

function Send_socket_xdcoder_udp($service_port, $address, $in) {
  //采用php socket技术使用UDP协议连接设备
  $socket = socket_create(AF_INET, SOCK_DGRAM, SOL_UDP);
  @socket_set_option($socket, SOL_SOCKET, SO_RCVTIMEO, array("sec" => 2, "usec" => 0));
  //发送命令
  @socket_sendto($socket, $in, strlen($in), 0, $address, $service_port);
  @socket_recvfrom($socket, $buffer, 1024, MSG_WAITALL, $address, $service_port);
  //关闭连接
  socket_close($socket);
  if (!empty($buffer)) {
    return $buffer;
  } else {
    echo "<script>alert(&#39;网络异常，请检查网络连接！！&#39;);</script>";
  }
}

3. Use RS232 serial port technology to connect the device to implement communication and send commands

Parameter$com Serial port
Parameter $baudratr Baud rate
Parameter $in Send command

function rs232_connect($com, $baudrate, $in) {
  @set_time_limit(10);
  //使用 'windows下设置窜口参数';
  exec("mode " . $com . " BAUD=" . $baudrate . " PARITY=n DATA=8 STOP=1 odsr=off");
  // "打开端口串口$com";
  $f = @fopen($com, 'w+');
  //判断串口是否正常打开
  if (!$f) {
    //echo "<script>alert(&#39;Error when open $com！！&#39;);</script>";
    die("Error when open $com");
  }
  //向串口发送数据;
  fwrite($f, $in);
  //关闭端口    
  fclose($f);
  //串口操作结束
}

There is also a hexadecimal conversion of the command:

function hexToStr($hex) {
  $string = "";
  for ($i = 0; $i < strlen($hex) - 1; $i+=3) {
    $string.=chr(hexdec($hex[$i] . $hex[$i + 1]));
  }
  return $string;
}

Related recommendations:

PHP socket server framework workerman

Explain the definition and usage of PHP Socket network operation class with examples

php Detailed introduction to Socket programming

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