# SIM908 GPRS connection closses automatically

Status
Not open for further replies.

#### bouvett2

##### Newbie level 5
Hi guys,

I have setup a TCPIP connection between my ITEAD SIM908 development board and a server on my PC(SocketTest v3) using the following code:

Code:
AT+CIPSHUT
AT+CIPMUX=0
AT+CIPSTATUS
AT+CSTT="internet","",""
AT+CIPSTATUS
AT+CIICR
AT+CIPSTATUS
AT+CIFSR
AT+CIPSTATUS
AT+CIPSTART="TCP","213.165.160.134","2000"
AT+CIPSEND=4
I test the connection in both directions, i.e. SIM908->SocketTest & SocketTest-> SIM908, and both worked successfully. After some time, approx. 10minutes, the connection stalls, and whenever I try to send data (both ways), no data is sent/received succesfully.

When I check the status of the SIM908 (using AT+CIPSTATUS), it first says "CONNECT OK". Then SocketTest says "Server closed Client connection". If I then check again the SIM908, it says "TCP CLOSED".

It seems as if, the connection stops automatically after some time. I have gone through the AT command manual of the SIM908, but there doesn't seem to be any such option.

Any help/suggestion would do.

Best regards

Status
Not open for further replies.