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SIM900 lost gprs session

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PetrolGda

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Hi

I make GPSR session like:

ATE0
AT+CSQ
AT-GSN
AT+CREG=2
AT+CIPMUX=0
AT+CSTT="internet","",""
AT+CIICR
AT+CIFSR
AT+CIPHEAD=1
AT+CDNSCFG="xxx.xxx.xxx.xxx"
AT+CIPSTART="TCP","aaa.aaa.aaa.aaa","port"
AT+CIPSEND

Then I get "> " and send data . It work well by long time.

Then I move modem by car to other palce. When modem change BTS the GPRS connection lost. CIPSHUT does not work too. Only reset ......

After reset modem work well until new BTS found. Then modem lost GPRS connection again.
Revision:1137B09SIM900M64_ST
 

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