PHP implements sending text messages through the serial port, and php serial port sends text messages_PHP tutorial

PHP can send text messages through the serial port, and PHP can send text messages through the serial port

With the advancement of technology, the field of text message sending and receiving has produced three modes in time: BLOCK MODE, and TEXT based on AT commands. MODE, PDU MODE based on AT command. 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 you can only send up to 70 characters, 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
​​ 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 – 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
                                                                                                                                                                                                                                                                     with Message Type with (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 been shifted 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 identification 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 short message 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 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
That is 11000D91683136187972F5000800044F60597D => 38 bits / 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:

<&#63;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; 
} 
  
&#63;> 

The above is the entire content of this article, I hope you all like it.

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