How can I extract the phone number and message when I recive a message?

Projects General Guidance
1

Hello
I was doing a project using a GSM SIM900 and I want to extract only the phone number and the content of message. Here is what I received from the serial

+CMT: "+251xxxxxx89","","23/03/27,11:54:22+12"
Hi
And I only want the phone number and the message 'Hi'.
thank you

2

Check Arduino/reference for string manipulating functions.

3

ok now I can extract the phone number but how can I extract the received message?

   textMessage = mySerial.readString();
   CellNumtemp = textMessage.substring(textMessage.indexOf("+251"));
   CellNum = CellNumtemp.substring(0,13);
   Serial.println(CellNum);  
   delay(1000);
 }
4

Is the last part of the header always: +12" ?

If so search for that in the same way that you searched for "+251".

You then need your substring to start at element 4 now instead of 0 (to omit +12" from the message).

You knew the length of the telephone number, but the length of the message will vary so use length() as the second parameter for the substring.

6

Thank you guys it works

7

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