get SMS message from a modem using a pic

[angel]

Hello
I am expecting a modem to send and get SMS messages.
I am preparing a test program to read SMS messages from the modem. When a SMS message will arrive to the modem, this will interrupt my PIC 200 ms before sending the message (so it would not be necessary a UART interrupt). But I don't know if the modem sends the message in 2 lines or 1 line. I mean I don't know if the message is sent using two \r. In this case, I would like to use the code :
-------------------------------------------------
if (kbhit(U12)){ //first line
delay_ms(1000);//wait for 1 second
if (kbhit(U12)){//second line
gets(message,U12);
}
}
----------------------------------------------------
has anyone experience about getting SMS messages?
is this code the best way to read a SMS message from the modem?

[asmallri]

SMS messages are both unstructured and vendor dependant. There are no <CR> <LF> characters unless your application sent them. You will have to test it on your target modem.

Reading the messages is not enough, you must delete the message as well, if not the sms message store will eventually fill and you will not receive any more messages.
_________________
Regards, Andrew

http://www.brushelectronics.com/software
Home of Ethernet, SD card and Encrypted Serial Bootloaders for PICs!!

[angel]

For example
After using the command AT+CMGR=1, I hope to receive :

+CMGR: "REC READ","609","02/02/27,18:166:51+40"
Here some message

OK

So 3 lines. If there are 3 lines is because in the message there are <CR> isn't it? And I was thinking to use the CCS command kbhit because it reads a string up to a <CR> is found.
Is all that correct? do you know other better way to read "Here some message" ?
After that I will remove the message in the modem using the AT+CMGD=1 command.

[asmallri]

The command acknowledgment format depends on the modem implemetation. A command echo will be depend on how the modem is configured. Similarly the 'OK <CR>' or 'OK <CR><LF>' sequence will depend on how you have configured the modem. These may be suppressed. For a commercial product you cannot rely on them being present unless you specifically send an initialization sequence to the modem every time the PIC is powered up to allow for the fact that a modem may be replaced in service.

The command format for reading an SMS message depends on the modem - it is not covered by any SMS standard therefore you will have to experiment with your modem.
_________________
Regards, Andrew

http://www.brushelectronics.com/software
Home of Ethernet, SD card and Encrypted Serial Bootloaders for PICs!!

[Ttelmah]

You are confused over what kbhit does. Kbhit, simply tells you that there is a character waiting in the input buffer(for the hardware UART), or that the start bit has been detected (for a software UART). It does not look for the CR character.
Kbhit, also does not remove characters from the input buffer, so when it goes 'true', it will remain true, till you read the character that has been received.
Gets, will get a string up to the CR character.But you then need to ensure that the storage space allowed is enough to handle any likely string that may arrive.

Best Wishes

[angel]

Of course in my last message I wanted to write : kbhit + gets to read a string up to a <CR> is found. I think, It could be a possiblility. In the message it is sure it will have a <CR> in the end because I will send it using other modem. But I will have to check if there are other before the message.
Any other code to get the message without using gets? Maybe reading characters individually and continously up to find 2 special characters in the message? fgetc could be a solution?

[densimitre]