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I'm using a SIM 900 GPRS Shield for Arduino for sending data using HTTP command; sometime when I use the command 

AT+HTTPACTION=1

I receive error code 604, that mean Stack Busy. Someone know what is the problem?

If I reset the board I receive the same this error; I note that if I turn off and turn on the GPRS board, so that I receive a new IP address, the error does not occur, so it's like if the old IP address is "blocked"; why?

Nicola
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  • It's not the new IP address that solves your problem. It is because you have re-started the protocol stack when you switch the board off and on. Probably this does more than a simple "reset". The error is in the message - the protocol stack is busy. Do other commands pass? – user1725145 Apr 15 '13 at 08:50
  • no, no other commands pass – Nicola Apr 16 '13 at 09:46
  • What is the command that makes the protocol stack hang? (probably the first command that doesn't return an answer) Can you report it to the manufacturer as a bug? Possibly a firmware upgrade would fix it. – user1725145 Apr 16 '13 at 12:53
  • this was the report: AT+HTTPPARA="URL","myaddress.com" AT+HTTPACTION=0 OK +HTTPACTION:0,604,0 – Nicola Apr 16 '13 at 15:53
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    It looks as though you didn't get an answer to AT+HTTPPARA="URL","myaddress.com" . Have you tried waiting for an answer before you send more AT commands? – user1725145 Apr 16 '13 at 17:35
  • i'm waiting for 10 seconds.. i could try to wait more time and using a timeout for avoiding an infinite wait – Nicola Apr 18 '13 at 10:25

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