PHP sends text messages through the serial port, PHP sends text messages through the serial port

PHP sends text messages through the serial port, and PHP sends text messages through the serial port

With the advancement of technology, three modes have been produced in the field of SMS sending and receiving in time: BLOCK MODE, and TEXT MODE based on AT commands. , PDU MODE based on AT commands. Among them, TEXT MODE is relatively simple, and many Nokia mobile phones support this mode. Most Siemens mobile phones only support PDU MODE. PDU mode is a method of sending and receiving text messages. The text of the text message is transmitted after hexadecimal encoding. Currently, PDU has replaced BLOCK MODE.

SMS is a specification developed by Etsi (GSM 03.40 and GSM 03.38). When using 7-bits encoding, it can send up to 160 characters; but with 8-bit encoding, it can send up to 140 characters, which usually cannot be displayed directly through the mobile phone; and when using 16-bit encoding, up to 70 characters, Used to display Unicode (UCS2) text information, which can be displayed by most mobile phones.

What we are discussing today is PDU MODE, UCS2 encoding, which means that a maximum of 70 characters can be sent, regardless of English or Chinese.
Suppose you want to send the following message: "Hello". Before sending, you need to know the SMS center number where the SIM card is located, such as China Mobile’s SMS center number:

Received mobile phone number: 13638197275
Hangzhou SMS Center Number: 13800571500
Text message content: Hello
To send this text message, the phone will execute it after encoding. After encoding, it will become the following string of characters:
0891683180501705F011000D91683136187972F5000800044F60597D
You don’t understand? Please explain this string of codes from beginning to end:
08 – It refers to the length of the SMS center number, that is, the length of (91) (683180501705F0) divided by 2, that is, 08 = (2 14) / 2
91 – Refers to the SMS center number type. 91 means that TON/NPI complies with the International/E.164 standard, which means that a ‘ ’ sign needs to be added before the number; there are other values, but 91 is the most commonly used.
683180501705F0 - SMS center number. Due to slight processing in position, the actual number should be: 8613800571500 (the letter F is a character added to make up the even length).
11 - File header bytes
00 - Message type (TP-Message-Reference)
0D - Called number length
91 - Called number type

In fact, in actual processing, we usually hard-code 11000D91 into the program, because in China, these data will not change.

683136187972F5 - The called number has undergone displacement processing and the actual number is "8613638197275".

The above (00 ) (0D ) (91 ) (683136187972F5 ), constitutes the second part of the destination address (TP-Destination-Address) of the entire text message.

Continue...
00 - Protocol identifier TP-PID, here is generally 00
08 - Data coding scheme TP-DCS (TP-Data-Coding-Scheme), using the USC2 (16bit) data coding mentioned earlier
00 - Validity period TP-VP (TP-Valid-Period)
04 - Length TP-UDL (TP-User-Data-Length), which is the hexadecimal 04 of the message length/2
4F60597D Here is the content of the text message, the actual content is: "Hello"

Based on the above situation, you can write the program script for SMS encoding.

1. SMS center number processing:
1. Remove the number from the SMS center number "8613800571500" and see if the length is an even number. If not, add F
at the end. => “8613800571500F”
2. Swap the odd and even digits.
=> “683108501705F0″
3. Add the character 91 in front of the SMS center number. 91 means international
=> “91683108501705F0″
4. Calculate the length, divide the result by 2, and format it into a 2-digit hexadecimal string, 16 / 2 = 8 => “08″
=> “0891683108501705F0″

2. Mobile phone number processing:
1. Remove the number from the mobile phone number 8613638197275 and see if the length is an even number. If not, add F
at the end. => “8613638197275F”
2. Swap the odd and even digits of the mobile phone number.
=> “683136187972F5″

3. Short message processing:
1. Convert string to Unicode code,
The unicode code of "Hello" is 4F60597D
2. Divide the length by 2 and retain two hexadecimal digits, that is, 4F60597D = 8 / 2 => “04″,
=> “044F60597D″

4. Combination
1. Add the string 11000D91 before the mobile phone number (1100: fixed, 0D: the length of the mobile phone number, not counting the + sign, expressed in hexadecimal, 91: send
91 to mobile phone, 81 to PHS),
That is 11000D91 683136187972F5
=> 11000D91683136187972F5
2. After the mobile phone number, add 000800 and the content of the text message just now. Just write down 000800
That is 11000D91683136187972F5 000800 044F60597D
=> 11000D91683136187972F5000800044F60597D
3. Divide the entire message length by 2 and format it into a 2-digit decimal number
Right now 11000D91683136187972F5000800044F60597D => 38 bit / 2 => 19

5. So the content to be sent is
AT CMGF=0 #This is to set the SMS sending mode PDU
OK
AT CMGS=19
> #Enter the text message content code

Attached final PHP code:

    <?php  
    // Requirement dio， use cmd install: pecl install dio  
    set_time_limit(0);  
      
    // Windows use COM1:  
    $fd=dio_open('/dev/ttyS0', O_RDWR);  
    if(!$fd)  
    {  
        die("打开串口ttyS0失败");  
    }  
      
    // dio_tcsetattr() only Linux   
    // Windows 使用 exec('mode COM1: baud=9600 data=8 stop=1 parity=n xon=on');  
    dio_tcsetattr($fd, array(  
      'baud' => 9600,  
      'bits' => 8,  
      'stop'  => 1,  
      'parity' => 0  
    ));  
      
    //$ff=dio_stat($fd);  
    //print_r($ff);  
    //echo "GSM AT is start on ttyS0\n";  
      
    //短信中心号码  
    $smsc = "8613800571500";  
    $invert_smsc = invertNumbers($smsc); // 转换短信中心号码  
    $inter = chr(13); // 回车字符  
      
    $ctrlz = chr(26); // ctrl+z  
      
    // 发送信息  
    $text   
       = '你好';  
    $send_to = '8613638197275';  
    $pdu_phone  = hex2str(utf82unicode($text));  
    $pdu_phone  = sprintf("%02X", strlen($pdu_phone)/2) . $pdu_phone;  
    $pdu_phone  = '11000D91' . invertNumbers($send_to) . '000800' . $pdu_phone;  
    $atcmd      = 'AT+CMGF=0' . $inter;  
    @dio_write($fd, $atcmd);  
    $atcmd      = 'AT+CMGS=' . sprintf("%d", strlen($pdu_phone)/2) . $inter;  
    @dio_write($fd, $atcmd);  
    $pdu_addr   = '0891' . invertNumbers($smsc);  
    $pdu_all    = $pdu_addr . $pdu_phone . $ctrlz . $inter;  
    @dio_write($fd, $pdu_all);  
    dio_close($fd);  
      
    // 我的是utf-8编码   
    function utf82unicode($str)    
    {  
        return iconv("utf-8", "UCS-2BE", $str);  
    }  
       
    function hex2str($hexstring)    
    {  
        $str = '';  
        for($i = 0, $len = strlen($hexstring); $i < $len; $i++)  
        {  
            $str .= sprintf("%02X", ord(substr($hexstring, $i, 1)));  
        }  
        return $str;  
    }  
       
    function invertNumbers($msisdn)    
    {  
        $len = strlen($msisdn);  
        if ( 0 != fmod($len, 2) )   
        {  
            $msisdn .= "F";  
            $len = $len + 1;  
        }  
       
        for ($i=0; $i<$len; $i+=2)   
        {  
            $t = $msisdn[$i];  
            $msisdn[$i] = $msisdn[$i+1];  
            $msisdn[$i+1] = $t;  
        }  
        return $msisdn;  
    }  
       
    ?>

Copy after login

Appendix 1 : Mobile SMS center numbers in various places Enter the SMS number of the local mobile office: +8613800xxx500 (" "number must be entered), Where xxx is the local telephone area code. --- Areas where the telephone area code is three digits: Simply replace xxx with the telephone area code. For example: Shenzhen’s telephone area code is 755. The mobile short message center number is: 8613800755500 --- Areas where the telephone area code is two digits: Please add "0" after the area code to replace xxx with three digits. For example: Beijing’s telephone area code is 10, The mobile short message center number is: 8613800100500 At present, China Unicom 165 network has launched operations nationwide. Before using the SMS service, you need to set the SMS center service number: Beijing 8613010112500 Shanghai 8613010314500 Shenzhen 8613010888500 Shandong 8613010171500 Jiangsu 8613010341500 Zhejiang 8613010360500 Fujian 8613010380500 Sichuan 8613010811500 Chongqing 8613010831500 Hainan 8613010501500 Heilongjiang 8613010980500 Jilin 8613010911500 Tianjin 8613010130500 Hebei 8613010180500 Inner Mongolia 8613010950500 Shanxi 8613010701500 Anhui 8613010305500 Xinjiang 8613010969500 Qinghai 8613010776500 Gansu 8613010879500 Ningxia 8613010796500 Guizhou 8613010788500 Yunnan 8613010868500 Hunan 8613010731500 Hubei 8613010710500 Guangdong 8613010200500 Guangxi 8613010591500 Henan 8613010761500 Jiangxi 8613010720500 Liaoning 8613010240500 Appendix 2 : Commonly used AT commands: AT CSMS Select Short Message Service AT CPMS select SMS memory AT CMGF Select SMS format AT CSCA SMS Center Address AT CNMI displays newly received text messages AT CMGR Read SMS AT CMGS Send SMS AT CMGL lists short messages in SIM card AT CMSS Send SMS from SIM memory AT CMGW writes the outgoing short message to the SIM memory. AT CMGD Delete short messages in SIM memory AT CSCB select cellular broadcast information Appendix 3 : Receiving short messages Receiving a short message is essentially reading the information from the SIM or cache. This mainly utilizes AT CMGR and AT CMG L two instructions to complete. Since different manufacturers of wireless modules have different interpretation codes and response messages for the AT command set, Therefore, you must first confirm whether communication with the MODEM can be established. Generally, AT commands are used to complete this confirmation; then AT CM is used to complete this confirmation. The GF command selects the data format of the short message; after receiving the correct answer from the MODEM, the AT command is used to complete the reading function. Generally, AT CMGL is used to read the previous information. When receiving the RING data of MODEM, AT CM is used. GR reads real-time information. The following is an example of receiving SMS using H6221-W, which illustrates the application of PDU mode. use. The operation process is as follows (comments in {}): Send: AT Answer: OK {Connection established} Send: AT CMGF=0 {Select PDU format} Answer: OK {Allow selection of PDU format} Send: AT CMGL=2 {List existing text messages} Answer: CMGL: 1, 2,, 24 {1 represents the number of messages, 2 represents unsent messages, 24 represents the total message capacity} 0D71683108370105F004000D81683179133208F10000026080410033802632184C F682D 95E0DC2B36D3D170A0243106933D97A0243106933D97A02451068B1983492608 OK The above set of hexadecimal strings in PDU format not only contains the content of the short message, but also contains the sender number, SMS center number, SMS sending time, etc. The information content is analyzed below: 0D: Short message center address (number) length. 91: SMS center number type, 91 is TON/NPI. TON/NPI complies with International/E.164 standard, It means that a ' ' sign needs to be added before the number; in addition, there can be other numerical values, but 91 is the most commonly used. 683108370105F0: The service center number used for SMSC short messages is 13807310500. it goes through sixteen The high and low nibbles are transposed in byte units, and the number is an odd number plus F, forming a HEX byte. 04: PDU type, file header bytes. 0B: Calling number length. 81: Calling number type. 3179133208F1: 0A The calling number has also been processed, and the actual number is 13973123801. 00: PID, which is the protocol identifier. 00: DCS short message encoding type is GSM Default Alphabet, which is composed of 7-bit ASCII code shifted into 8-bit Hexadecimal code (octet), its method is shown in Table 2. 1sthex B0 A6 A5 A4 A3 A2 A1 A0 2ndhex C1 C0 B6 B5 B4 B3 B2 B1 3rdhex D2 D1 D0 C6 C5 C4 C3 C2 4thhex E3 E2 E1 E0 D6 D5 D4 D3 5thhex F4 F3 F2 F1 F0 E6 E5 E4 6thhex G5 G4 G3 G2 G1 G0 F6 F5 6thhex H6 H5 H4 H3 H2 H1 H0 G6 02608041003380: SCTS SMS sending time, 02/06/08/14:00:33.08. 26: UDL processed 8-bit code (octet) short message byte length, which is smaller than the message ASCII code length. 32184CF682D95E30DC2B36D3D170A0243106933D97A0243106933D97A0245106 8B1983492608: UD encoded PDU Data, SMS content "2002/06/08/13: 48ID102OKID103 OK ID201FAIL".