ARM+linux system transplantation 3G dial-up Internet access to send and receive text messages Part 3

1. Use text viewing mode The
"send" below refers to the command I typed, and "receive" refers to the information displayed after pressing Enter, including other received information.
~ >: microcom -s 115200 /dev/ttyUSB1
Send: at
Receive: OK


Set to text mode Read:
Send: at+cmgf=1


Receive: OK


Save the information in the SIM card:


Send: at+cpms="SM","SM","SM"
Receive: +CPMS: 0,50,0,50,0,50


Receive: OK




Waiting to receive text messages. . . . . .




After receiving, there will be this prompt message:
Receive: +CMTI: "SM", 0


View information:
Send: at+cmgl="rec unread"
Receive: +CMGL: 0,"REC UNREAD","+8613135699576",,"13/07/14,22:11:10+32"
Receive: 4F60597D
After a unicode converter 4F60597D ===> Hello


Receive: OK




2. PDU mode view


The following is an example from the Internet


Suppose the terminal receives a text message:
+CMT: ,24


0891683108200205F0240D91683157121468F0000860800331220000044F60597D


The current task is to reverse the code to obtain the information.
The following is an analysis of the received PDU data:


(1) 08 //The length of the information center number, the length of 91+683108200205F0 is divided by 2 and formatted into a 2-digit hexadecimal string


(2) 91 //SMS center number type


(3) 683108200205F0 //SMS center number, the conversion method has been mentioned before


     ==>+8613800220500


(4) 24 //TPDU header byte


(5) 0D //The length of the source number, the length of 8613752141860 is formatted into a 2-digit hexadecimal string


(6) 91 //Sending source number type


(7) 683157121468F0 //Sending source number, the sending end number is:
     
     ==>+8613752141860
     


(8) 00 //Protocol identifier TP-PID


(9) 08 //Data encoding scheme, 08: Chinese encoding, 00 is English or number, Bit No.7 and Bit No.6


(10) 608003312200 //Date and time, odd and even swapped: 06-08-30 13:22:00. Some forums say that the received number is 026080... that is, there is a '02' in front, indicating 2006-08... But when I use different mobile phones to send text messages, the received number is 06, and 2006 cannot be obtained. I don’t know if it is a problem with the sender’s mobile phone settings or somewhere else. I am still studying it.


(11) 00 //Time zone


(12) 04 //User data length TP-UDL (TP-User-Data-Length), the length of 4F60597D divided by 2 and formatted into a 2-digit hexadecimal number

 (13) 4F60597D //UNICODE code for "Hello":

 

Providing an example:

PDU mode view




The SMS prompt information received by the terminal:
+CMTI: "SM",2


+CMGL: 2,0,,28
0891683108200705F4240D91685123377660F0000831704132305423084F60597D00200020


The current task is to reverse the encoding to obtain the information.
The following is an analysis of the received PDU data:


(1) 08 //The length of the information center number, the length of 91+683108200205F0 is divided by 2 and formatted into a 2-digit hexadecimal string


(2) 91 //SMS center number type


(3) 683108200705F4 //SMS center number, the conversion method has been mentioned before


     ==>+8613800270504


(4) 24 //TPDU header byte


(5) 0D //The length of the source number, the length of 8613752141860 is formatted into a 2-digit hexadecimal string


(6) 91 //Sending source number type


(7) 685123377660F0 //Sending source number, the sending end number is:
     
     ==>+8615327367060
     


(8) 00 //Protocol identifier TP-PID


(9) 08 //Data encoding scheme, 08: Chinese encoding, 00 is English or number, Bit No.7 and Bit No.6


(10) 317041323054 //Date and time, odd and even swapped: 13-07-14 23:03:45, some forums say that the received number is 026080... that is, there is a '02' in front, indicating 2006-08... But I used different mobile phones to send text messages and the received number was 06. I couldn't get 2006. I don't know if it is a problem with the sender's mobile phone settings or somewhere else. I am still studying it.


(11) 23 //Time zone


(12) 08 //User data length TP-UDL (TP-User-Data-Length), the length of 4F60597D is divided by 2 and formatted into a 2-digit hexadecimal number


 (13) 4F60597D00200020 //"Hello" UNICODE code with two spaces:




IV. View the read information
OK
at+cmgl=0
OK
at+cmgf=1
OK
at+cmgl="rec read"
+CMGL: 0,"REC READ","+8613135699576",,"13/07/14,22:11:10+32"
4F60597D
+CMGL: 1,"REC READ","+8615327367060",,"13/07/14,23:00:50+32"
hello.good work.
+CMGL: 2,"REC READ"," +8615327367060",,"13/07/14,23:03:45+32"
4F60597D00200020


OK
at+cmgl=1
ERROR
at+cmgf=0
OK
at+cmgl=1
+CMGL: 0,1,,24
0891683108200705F6240D91683131659975F6000831704122110123044F60597D
+CMGL: 1,1,,35
0891683108200705F6240D91685123377660F000003 170413200052311E8329BFD769DDF6F3208747FCBD72E
+CMGL: 2,1,,28
0891683108200705F4240D91685123377660F0000831704132305423084F60597D00200020


OK