[SOLVED] [problem] AT+CGATT makes my modem unable to send SMS

[saesaria]

Hi!
I tried the sequence of AT-commands to connect to GPRS (you can see on https://www.edaboard.com/threads/217319/)

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AT+CGATT=1
OK
 
AT+CGDCONT=1,"IP","INTERNET";+CGDCONT=1,"IP","3gprs"
OK
 
AT+WIPCFG=1 //START IP STACK
OK
 
AT+WIPBR=1,6 // OPEN GPRS BEARER
OK
 
AT+WIPBR=2,6,11,"3gprs" //SET APN NAME
OK
 
AT+WIPBR=2,6,0,"3gprs" //SET USERNAME
OK
 
AT+WIPBR=2,6,1,"3gprs" //SET PASSWORD
OK
 
AT+WIPBR=4,6,0 //START GPRS BEARER
OK
 
AT+WIPCREATE=2,1,"www.google.com",80 //CREATE TCP CLIENT
OK
 
+WIPREADY: 2,1

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when I detach from GPRS (change CGATT value to 0), then the LED indicator of my modem is freezing. After doing the sequence of AT-commands, I can't send SMS anymore by using AT+CMGS, it always gives me +CMS ERROR 512.

I think my procedure to detach from the GPRS is wrong. The CGATT is still 1 after I re-powering the modem.
Is there anyone here can share the way to solve it?
thanks.

 

[saesaria]

There's hardware issue