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SIM900B sends empty SMS message

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RATHINAVELA

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Hi,

The SMS which sent through SIM900B are going out empty (means when I receive the SMS in the other end it was empty). Please help me to solve this problem.

Message sequence used for sending the SMS.

AT+CMGF=1<CR> // Text mode to send SMS

AT+CSMP=17,169,0,0<CR> // SMS Sumit period 1 day


AT+CMGS = "+9127833074" <CR> // SMS Send part 1
delayMs(500) // For the response of >
hello // SMS send part 2
delayMs(500)
<Ctrl-Z> // SMS send part 3

The SMS was sent successfully ; but the content was empty; the data part "hello" was not reached other end.
 

After setting the character set to "GSM", the message sent out through SIM900 was visible in the received mobiles.

AT+CSCS="GSM"<CR> // set the character set to "GSM"

But the new problem is, it adds '@' symbol in the beginning and the end of the message. Please let me how to eliminate these extra '@' from the message. Thanks.
 

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