PHP implements methods for connecting devices, communications, and sending commands _php tips

This article illustrates the way PHP implements connecting devices, communications, and sending commands. Share to everyone for your reference. Specifically as follows:

The development of the BS Architecture Software (PHP), the need to communicate with the device, in this record, you are welcome to correct:

1. Using PHP socket technology to connect devices with TCP/IP

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

function Send_socket_connect ($service _port, $address, $in) {
//create TCP/IP Socket$socket = socket_create (Af_inet, Sock_stream, sol_tcp) or die ("could not create socket!");
  Set timeout time
  $timeout = 2;
  $time = time ();
  Set the non-blocking mode
  @socket_set_nonblock ($socket);
  Timeout judgment while
  (! @socket_connect ($socket, $address, $service _port)) {
    $err = Socket_last_error ($socket);
    Connection succeeded, jump out of Loop
    if ($err = = 10056) {break
      ;
    }
    The connection fails, the timeout is judged, and the IF (Time
    ()-$time) >= $timeout) {
      socket_close ($socket) is stopped;
      Print (' Network exception, please check the network connection!! ');
      Exit ();
    }
    Refresh frequency (250 milliseconds)
    usleep (250000);
  }
  Set the blocking mode
  @socket_set_block ($socket);
  Send command to Device
  Socket_write ($socket, $in, strlen ($in));
  Close connection
  socket_close ($socket);

Send_socker_xdcoder $buffer to return value

function Send_socket_xdcoder ($service _port, $address, $in) {
  //create TCP/IP socket
  $socket = socket_create (af_ INET, Sock_stream, sol_tcp) or die ("could not create socket!");
  Set timeout time
  $timeout = 2;
  $time = time ();
  Set the non-blocking mode
  @socket_set_nonblock ($socket);
  Timeout judgment while
  (! @socket_connect ($socket, $address, $service _port)) {
    $err = Socket_last_error ($socket);
    Connection Success
    if ($err = = 10056) {break
      ;
    }
    The connection fails, the timeout is judged, and the IF (Time
    ()-$time) >= $timeout) {
      socket_close ($socket) is stopped;
      echo "<script>alert (' network exception, check your network connection!! ');</script> ";
      Exit ();
    }
    Refresh frequency (250 milliseconds)
    usleep (250000);
  }
  Set the blocking mode
  @socket_set_block ($socket);
  Send command to Device
  Socket_write ($socket, $in, strlen ($in));
  Receive device command return data
  $buffer = Socket_read ($socket, 1024, php_normal_read);
  Close connection
  socket_close ($socket);
  The output return value returns
  $buffer;
}

2. Use the PHP socket technology to connect the device using the UDP protocol to achieve 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) {
  //PHP Socket technology uses the UDP protocol to connect the device
  $socket = socket _create (Af_inet, Sock_dgram, sol_udp);
  @socket_set_option ($socket, Sol_socket, So_rcvtimeo, Array ("SEC" => 2, "USEC" => 0));
  Send command
  @socket_sendto ($socket, $in, strlen ($in), 0, $address, $service _port);
  @socket_recvfrom ($socket, $buffer, 1024, Msg_waitall, $address, $service _port);
  Close connection
  if (empty ($buffer)) {
    echo <script>alert (' Network exception, check network connection!! ');</script> ";
  }
}

SEND_SOCKET_XDCODER_UDP $buffer to return value

function send_socket_xdcoder_udp ($service _port, $address, $in) {
  //PHP Socket technology uses the UDP protocol to connect the device
  $socket = socket _create (Af_inet, Sock_dgram, sol_udp);
  @socket_set_option ($socket, Sol_socket, So_rcvtimeo, Array ("SEC" => 2, "USEC" => 0));
  Send command
  @socket_sendto ($socket, $in, strlen ($in), 0, $address, $service _port);
  @socket_recvfrom ($socket, $buffer, 1024, Msg_waitall, $address, $service _port);
  Close connection
  socket_close ($socket);
  if (!empty ($buffer)) {return
    $buffer;
  } else {
    echo <script>alert (' network exception, check your network connection!! ');</script> ";
  }
}

3. Use RS232 serial port technology to connect equipment, realize communication and send command

Parameter $com string number
Parameter $baudratr baud rate
Parameter $in Send command

function Rs232_connect ($com, $baudrate, $in) {
  @set_time_limit (a);
  Use ' windows to set channeling parameters ';
  EXEC ("mode"). $com. "Baud=". $baudrate. "Parity=n data=8 stop=1 Odsr=off");
  "Open port serial $com";
  $f = @fopen ($com, ' w+ ');
  To determine if the serial port is normal open if
  (! $f) {
    //echo "<script>alert" (' Error when open $com!! ');</script> ";
    Die ("Error when Open $com");
  }
  Sending data to the serial port;
  Fwrite ($f, $in);
  Close Port    
  fclose ($f);
  Serial Operation End
}

There is also one about the command 16 conversion:

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

I hope this article will help you with your PHP program design.