Send SMS via GSM Modem Using PHP

<?php

//SMS via GSM Modem - A PHP class to send SMS messages via a GSM modem 

  attached to the computers serial port.

//Windows only (tested on XP with PHP 5.2.6)
//Tested with the EZ863 (Telit GE863) GSM modem
//Requires that PHP has permission to access "COM" system device, 

  and system "mode" command

error_reporting(E_ALL);

//Example

$gsm_send_sms = new gsm_send_sms();
$gsm_send_sms->debug = false;
$gsm_send_sms->port = 'COM1';
$gsm_send_sms->baud = 115200;
$gsm_send_sms->init();

$status = $gsm_send_sms->send('+44123456789', 'testing 123');
if ($status) {
 echo "Message sent\n";
} else {
 echo "Message not sent\n";
}

$status = $gsm_send_sms->send('+44123456789', 'testing 456');
if ($status) {
 echo "Message sent\n";
} else {
 echo "Message not sent\n";
}

$gsm_send_sms->close();







//Send SMS via serial SMS modem
class gsm_send_sms {

 public $port = 'COM1';
 public $baud = 115200;

 public $debug = false;

 private $fp;
 private $buffer;

 //Setup COM port
 public function init() {

  $this->debugmsg("Setting up port: \"{$this->port} @ \"{$this->baud}\" baud");

  exec("MODE {$this->port}: BAUD={$this->baud} PARITY=N DATA=8 STOP=1", $output, $retval);

  if ($retval != 0) {
   throw new Exception('Unable to setup COM port, check it is correct');
  }

  $this->debugmsg(implode("\n", $output));

  $this->debugmsg("Opening port");

  //Open COM port
  $this->fp = fopen($this->port . ':', 'r+');

  //Check port opened
  if (!$this->fp) {
   throw new Exception("Unable to open port \"{$this->port}\"");
  }

  $this->debugmsg("Port opened");
  $this->debugmsg("Checking for responce from modem");

  //Check modem connected
  fputs($this->fp, "AT\r");

  //Wait for ok
  $status = $this->wait_reply("OK\r\n", 5);

  if (!$status) {
   throw new Exception('Did not receive responce from modem');
  }

  $this->debugmsg('Modem connected');

  //Set modem to SMS text mode
  $this->debugmsg('Setting text mode');
  fputs($this->fp, "AT+CMGF=1\r");

  $status = $this->wait_reply("OK\r\n", 5);

  if (!$status) {
   throw new Exception('Unable to set text mode');
  }

  $this->debugmsg('Text mode set');

 }

 //Wait for reply from modem
 private function wait_reply($expected_result, $timeout) {

  $this->debugmsg("Waiting {$timeout} seconds for expected result");

  //Clear buffer
  $this->buffer = '';

  //Set timeout
  $timeoutat = time() + $timeout;

  //Loop until timeout reached (or expected result found)
  do {

   $this->debugmsg('Now: ' . time() . ", Timeout at: {$timeoutat}");

   $buffer = fread($this->fp, 1024);
   $this->buffer .= $buffer;

   usleep(200000);//0.2 sec

   $this->debugmsg("Received: {$buffer}");

   //Check if received expected responce
   if (preg_match('/'.preg_quote($expected_result, '/').'$/', $this->buffer)) {
    $this->debugmsg('Found match');
    return true;
    //break;
   } else if (preg_match('/\+CMS ERROR\:\ \d{1,3}\r\n$/', $this->buffer)) {
    return false;
   }

  } while ($timeoutat > time());

  $this->debugmsg('Timed out');

  return false;

 }

 //Print debug messages
 private function debugmsg($message) {

  if ($this->debug == true) {
   $message = preg_replace("%[^\040-\176\n\t]%", '', $message);
   echo $message . "\n";
  }

 }

 //Close port
 public function close() {

  $this->debugmsg('Closing port');

  fclose($this->fp);

 }

 //Send message
 public function send($tel, $message) {

  //Filter tel
  $tel = preg_replace("%[^0-9\+]%", '', $tel);

  //Filter message text
  $message = preg_replace("%[^\040-\176\r\n\t]%", '', $message);

  $this->debugmsg("Sending message \"{$message}\" to \"{$tel}\"");

  //Start sending of message
  fputs($this->fp, "AT+CMGS=\"{$tel}\"\r");

  //Wait for confirmation
  $status = $this->wait_reply("\r\n> ", 5);

  if (!$status) {
   //throw new Exception('Did not receive confirmation from modem');
   $this->debugmsg('Did not receive confirmation from modem');
   return false;
  }

  //Send message text
  fputs($this->fp, $message);

  //Send message finished indicator
  fputs($this->fp, chr(26));

  //Wait for confirmation
  $status = $this->wait_reply("OK\r\n", 180);

  if (!$status) {
   //throw new Exception('Did not receive confirmation of messgage sent');
   $this->debugmsg('Did not receive confirmation of messgage sent');
   return false;
  }

  $this->debugmsg("Message sent");

  return true;

 }

}

?>

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