异常情况：“未收到使用GSM modem发送短信的调制解调器的响应”

Question

我正在使用GPRS调制解调器发送短信使用php与这个装置。

我用AT测试了我的设备，以确定我的设备是否工作正常，并成功地发送了。

然后我尝试了这个链接，它使用PHP通过GPRS：https://www.sitepoint.com/community/t/send-sms-using-gsm-modem/28584发送短信。

以下是所提供的代码：

<?php 

//Example

error_reporting(E_ALL);

//Example

$gsm_send_sms = new gsm_send_sms();
$gsm_send_sms->debug = true;
$gsm_send_sms->port = 'COM4';
$gsm_send_sms->baud = 9600;
$gsm_send_sms->init();

$status = $gsm_send_sms->send('+639153380630', 'testing 123');
if ($status) {
    echo "Message sent\
";
} else {
    echo "Message not sent\
";
}

$gsm_send_sms->close();


//Send SMS via serial SMS modem
class gsm_send_sms {

    public $port = 'COM4';
    public $baud = 9600;

    public $debug = true;

    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;
    }
}
?>

执行代码后，PHP将返回以下错误：

Setting up port: "COM4 @ "9600" baud
Status for device COM4: -----------------------
Baud: 9600 Parity: None Data Bits: 8 Stop Bits: 1
Timeout: OFF XON/XOFF: OFF
CTS handshaking: OFF
DSR handshaking: OFF
DSR sensitivity: OFF
DTR circuit: ON
RTS circuit: ON
Opening port
Port opened
Checking for responce from modem
Waiting 5 seconds for expected result
Now: 1580560507, Timeout at: 1580560512
Received:
Now: 1580560508, Timeout at: 1580560512 
Received: 
Now: 1580560508, Timeout at: 1580560512 
Received: 
Now: 1580560508, Timeout at: 1580560512 
Received: 
Now: 1580560508, Timeout at: 1580560512 
Received: 
Now: 1580560508, Timeout at: 1580560512 
Received: 
Now: 1580560509, Timeout at: 1580560512 
Received: 
Now: 1580560509, Timeout at: 1580560512 
Received: 
Now: 1580560509, Timeout at: 1580560512 
Received: 
Now: 1580560509, Timeout at: 1580560512 
Received: 
Now: 1580560509, Timeout at: 1580560512 
Received: 
Now: 1580560510, Timeout at: 1580560512 
Received: 
Now: 1580560510, Timeout at: 1580560512 
Received: 
Now: 1580560510, Timeout at: 1580560512 
Received: 
Now: 1580560510, Timeout at: 1580560512 
Received: 
Now: 1580560510, Timeout at: 1580560512 
Received: 
Now: 1580560511, Timeout at: 1580560512 
Received: 
Now: 1580560511, Timeout at: 1580560512 
Received: 
Now: 1580560511, Timeout at: 1580560512 
Received: 
Now: 1580560511, Timeout at: 1580560512 
Received: 
Now: 1580560511, Timeout at: 1580560512 
Received: 
**Timed out**
**Fatal error: Uncaught Exception: Did not receive responce from modem in C:\xampp\htdocs\sms_test\text1.php:77 **
Stack trace: 
#0 C:\xampp\htdocs\sms_test\text1.php(13): gsm_send_sms->init() 
#1 {main} thrown in C:\xampp\htdocs\sms_test\text1.php on line 77

Answer 1

您的异常(即自定义生成的异常)的根本原因不是在试图发送SMS时使用的AT命令序列中。我可以确认它是正确的，也可以通过您在AT测试器上的测试来确认。

/* Set SMS text mode */
AT+CMGF=1\r
OK

/* Send SMS */
AT+CMGS="---destination Number---"\r
> SMS Contents
CTRL+Z

+CGMS: <N>
OK

只缺少一个初步步骤:通过AT+CSCA命令设置Service地址的步骤，但是由于您能够使用AT测试器发送消息，所以我假设它已经设置好了。

，让我们分析一下您的日志。发生此异常是因为在您发送的第一个命令：AT之后没有收到响应。您等待它的响应最多5秒，这通常是立即出现的(< 100 to )。由于您没有收到它，显然意味着存在一些通信问题。

让我们直接从附加的调试日志中查看您的通信参数：

Setting up port: "COM4 @ "9600" baud
Status for device COM4: -----------------------
Baud: 9600 Parity: None Data Bits: 8 Stop Bits: 1
Timeout: OFF
XON/XOFF: OFF
CTS handshaking: OFF
DSR handshaking: OFF
DSR sensitivity: OFF
DTR circuit: ON
RTS circuit: ON

我可以建议下列核对清单：

1. 你的设备接通正确了吗？
2. 确保您正在使用正确的COM端口。
3. 在启动PHP脚本之前，一定要断开AT测试器和任何其他COM终端的连接
4. 检查你的下流率。通常，蜂窝调制解调器的默认波特率是115200 (如果未启用自动加载)，因此我将开始尝试此更改。
5. '8n1‘(数据位-奇偶校验-停止位)通常是默认设置，因此它可能是正确的。我们可以对所有其他设置说同样的话。在更改它们之前，作为最后手段，通过AT测试器通过AT测试器检查调制解调器的当前设置，方法是发出AT+IPR? (查询当前波特率)、AT+ICF? (查询字符帧格式，例如8n1)和AT&V (查询当前配置文件状态，包括流控制设置)。