reading SMS from Gsm phone - Electronic Circuits Projects Diagrams Free

ahmedragia21 · 25th April 2009, 07:50 PM

Hi, i've managed to use AT commands to send an sms to a cell phone, i wanna read the first message , i know the command its AT+CMGR=0; for index 0 , but at hyperterminal there are many strings have been outputed that includes the phone number , time ..etc and finally the SMS , i dont know how to extract the sms from all these things ?

also , the phone worked only when i tired CTR to 5V and RTS to GND , is this correct ?? im not sure how the AT command for sending SMS worked then ...

Sceadwian · 25th April 2009, 07:53 PM

You'll have to decode the SMS header that the phone is sending to you, it's going to have a set format.

Does this help?
SMS messages and the PDU format

Google is your friend =)

ahmedragia21 · 25th April 2009, 07:55 PM

I'm not using PDU message , i use TEXT message instead ...

Sceadwian · 25th April 2009, 08:06 PM

I'm not sure what problem you're having, parse the text you receive and drop the information you don't want.

Funny NYPD · 25th April 2009, 08:10 PM

Can you post what you got on your computer?

ahmedragia21 · 25th April 2009, 08:26 PM

yea sure

AT+CMGR=1
+CMGR: "REC READ","+20101880936","","09/04/25,05:27:55+12"
Switch1on

OK

Sceadwian · 25th April 2009, 08:41 PM

So what's the problem?
The text message itself is on it's own line, it's sitting right there ready for you to pick it out =) After you send the AT command ignore up until the first carriage return (or CR/LF depending on what's being sent) and then save up until the next line.

ahmedragia21 · 25th April 2009, 08:43 PM

so im gonna save up to 20 charas in an array ??
i thought about save the full buffer and then strcmp it ?

ahmedragia21 · 25th April 2009, 08:45 PM

The problem is in code ,how do i ignore the reading ?
just read chars 20 times for examples ?

Sceadwian · 25th April 2009, 08:55 PM

Well it depends on what other responses you might get back from the AT command, for example what happens if there is no text message to retrieve from the index specified, also how do you determine if this is a new SMS message or an old one? Are there any other error messages that could occur?

If you're sure that your AT comand is going to result in a valid SMS message not some other error message then simply ignore everything received up until the first CR/LF and then save everything into a buffer until the next CR/LF that will be your SMS message. You could buffer the whole thing and strcomp that.

Sceadwian · 25th April 2009, 08:57 PM

I would use a terminal program such as bray's terminal which allows you to look at the data that's coming in in hex/dec/binary as well as show it in ascii, that way you can see if each line is a CR or CR/LF As soon a the CR or CR/LF pair was received do your comparison then.

Diver300 · 25th April 2009, 10:55 PM

AT+CMGL="ALL"

will retrieve all text messages when it text mode.

Silversolar · 26th April 2009, 09:49 AM

You should also anticipate an errors if there are no SMS to read. Try clearing the phone's inbox and read the message. The phone should reply an error message and your software should recognize this. If there is no error, the message is on the second line after the cr/lf.

If you have several messages in the inbox, try using AT+CMGR=1 to read the first message in the inbox. AT+CMGR=2 for the second, and so on.

You can use AT+CMGL to read new messages that were not read yet. It will be helpful if you empty the inbox after reading so your inbox will not get full with an AT+CMGD=1 command to delete the message in memory1.

Manor_Villages · 26th April 2009, 08:35 PM

Here is something that might be useful "ahmedragia21".

ahmedragia21 · 26th April 2009, 11:45 PM

Thanks so much , manor villages

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25th April 2009, 07:50 PM	#1
ahmedragia21	reading SMS from Gsm phone Hi, i've managed to use AT commands to send an sms to a cell phone, i wanna read the first message , i know the command its AT+CMGR=0; for index 0 , but at hyperterminal there are many strings have been outputed that includes the phone number , time ..etc and finally the SMS , i dont know how to extract the sms from all these things ? also , the phone worked only when i tired CTR to 5V and RTS to GND , is this correct ?? im not sure how the AT command for sending SMS worked then ...

25th April 2009, 07:53 PM	#2
Sceadwian	You'll have to decode the SMS header that the phone is sending to you, it's going to have a set format. Does this help? SMS messages and the PDU format Google is your friend =) __________________ "Because I be what I be. I would tell you what you want to know if I could, mum, but I be a cat, and no cat anywhere ever gave anyone a straight answer, har har." Last edited by Sceadwian; 25th April 2009 at 07:53 PM.

25th April 2009, 07:55 PM	#3
ahmedragia21	I'm not using PDU message , i use TEXT message instead ...

25th April 2009, 08:06 PM	#4
Sceadwian	I'm not sure what problem you're having, parse the text you receive and drop the information you don't want. __________________ "Because I be what I be. I would tell you what you want to know if I could, mum, but I be a cat, and no cat anywhere ever gave anyone a straight answer, har har."

25th April 2009, 08:10 PM	#5
Funny NYPD	Can you post what you got on your computer? __________________ F.N.

25th April 2009, 08:26 PM	#6
ahmedragia21	yea sure AT+CMGR=1 +CMGR: "REC READ","+20101880936","","09/04/25,05:27:55+12" Switch1on OK

25th April 2009, 08:41 PM	#7
Sceadwian	So what's the problem? The text message itself is on it's own line, it's sitting right there ready for you to pick it out =) After you send the AT command ignore up until the first carriage return (or CR/LF depending on what's being sent) and then save up until the next line. __________________ "Because I be what I be. I would tell you what you want to know if I could, mum, but I be a cat, and no cat anywhere ever gave anyone a straight answer, har har."

25th April 2009, 08:43 PM	#8
ahmedragia21	so im gonna save up to 20 charas in an array ?? i thought about save the full buffer and then strcmp it ?

25th April 2009, 08:45 PM	#9
ahmedragia21	The problem is in code ,how do i ignore the reading ? just read chars 20 times for examples ?

25th April 2009, 08:55 PM	#10
Sceadwian	Well it depends on what other responses you might get back from the AT command, for example what happens if there is no text message to retrieve from the index specified, also how do you determine if this is a new SMS message or an old one? Are there any other error messages that could occur? If you're sure that your AT comand is going to result in a valid SMS message not some other error message then simply ignore everything received up until the first CR/LF and then save everything into a buffer until the next CR/LF that will be your SMS message. You could buffer the whole thing and strcomp that. __________________ "Because I be what I be. I would tell you what you want to know if I could, mum, but I be a cat, and no cat anywhere ever gave anyone a straight answer, har har."

25th April 2009, 08:57 PM	#11
Sceadwian	I would use a terminal program such as bray's terminal which allows you to look at the data that's coming in in hex/dec/binary as well as show it in ascii, that way you can see if each line is a CR or CR/LF As soon a the CR or CR/LF pair was received do your comparison then. __________________ "Because I be what I be. I would tell you what you want to know if I could, mum, but I be a cat, and no cat anywhere ever gave anyone a straight answer, har har."

25th April 2009, 10:55 PM	#12
Diver300	AT+CMGL="ALL" will retrieve all text messages when it text mode. __________________ http://nottheboss.wordpress.com/

26th April 2009, 09:49 AM	#13
Silversolar	You should also anticipate an errors if there are no SMS to read. Try clearing the phone's inbox and read the message. The phone should reply an error message and your software should recognize this. If there is no error, the message is on the second line after the cr/lf. If you have several messages in the inbox, try using AT+CMGR=1 to read the first message in the inbox. AT+CMGR=2 for the second, and so on. You can use AT+CMGL to read new messages that were not read yet. It will be helpful if you empty the inbox after reading so your inbox will not get full with an AT+CMGD=1 command to delete the message in memory1.

26th April 2009, 11:45 PM	#15
ahmedragia21	Thanks so much , manor villages