+ Post New Thread
Results 1 to 8 of 8
  1. #1
    Newbie level 6
    Points: 1,630, Level: 9
    Achievements:
    7 years registered

    Join Date
    Jan 2007
    Posts
    12
    Helped
    0 / 0
    Points
    1,630
    Level
    9

    SMS and GPRS help for SIM300

    I have a sim300 GSM/GPRS module which is connected to 8051.

    I have programs to send SMS and to send data to remote server via GPRS. Both of these work fine separately.

    The Problem:
    If i send data to server through GPRS first, close connection and then send SMS ,both functions works fine.
    But if i send SMS and then connect to GPRS, i get a <IP STATUS> for AT_CIICR.
    But AT+CIPSTART returns <TCP/UDP CONNECTING> and stays that way infinitly. I tried the procedure also using putty.

    I need the modem to work normally either way i execute the functions, or is this the way the modem works or am i missing something.

    Most of the commands that i have used in my program, i have got from edaboard forum so thanks for all the contributers.:-D:-D

    Regards
    Gokkul

    •   Alt1st March 2011, 08:41

      advertising

        
       

  2. #2
    Advanced Member level 5
    Points: 33,613, Level: 44
    ckshivaram's Avatar
    Join Date
    Apr 2008
    Location
    villingen (Germany) / Bangalore
    Posts
    5,070
    Helped
    2154 / 2154
    Points
    33,613
    Level
    44
    Blog Entries
    1

    Re: SMS and GPRS help for SIM300

    Search this forum... i already replied to this many times.....
    " It is so simple to be happy,
    but it is so difficult to be simple"



    •   Alt1st March 2011, 08:44

      advertising

        
       

  3. #3
    Newbie level 6
    Points: 1,630, Level: 9
    Achievements:
    7 years registered

    Join Date
    Jan 2007
    Posts
    12
    Helped
    0 / 0
    Points
    1,630
    Level
    9

    Re: SMS and GPRS help for SIM300

    There are replies in the forum and as i said the functions work separately. But GPRS fails after SMS.

    If there are solutions would you be kind enough to point me to them.



    •   Alt1st March 2011, 11:50

      advertising

        
       

  4. #4
    Advanced Member level 5
    Points: 33,613, Level: 44
    ckshivaram's Avatar
    Join Date
    Apr 2008
    Location
    villingen (Germany) / Bangalore
    Posts
    5,070
    Helped
    2154 / 2154
    Points
    33,613
    Level
    44
    Blog Entries
    1

    Re: SMS and GPRS help for SIM300

    first do at+CIPSHUT and then send message and again setup the GPRS command,,, it should work.... because sms does not need GPRS configuration.. SMS can be sent in both GPRS and GSM mode.... but not the other way..

    If you send SMS then GPRS is deactivated in these modules and need to run the setup by shutting down all the drivers...........



  5. #5
    Newbie level 6
    Points: 1,630, Level: 9
    Achievements:
    7 years registered

    Join Date
    Jan 2007
    Posts
    12
    Helped
    0 / 0
    Points
    1,630
    Level
    9

    Re: SMS and GPRS help for SIM300

    Do operators in India support SMS over GPRS?



  6. #6
    Newbie level 6
    Points: 1,630, Level: 9
    Achievements:
    7 years registered

    Join Date
    Jan 2007
    Posts
    12
    Helped
    0 / 0
    Points
    1,630
    Level
    9

    Re: SMS and GPRS help for SIM300

    Quote Originally Posted by ckshivaram View Post
    If you send SMS then GPRS is deactivated in these modules and need to run the setup by shutting down all the drivers...........
    ?? Run Setup by shutting down all driver..... could you elaborate



  7. #7
    Newbie level 6
    Points: 1,630, Level: 9
    Achievements:
    7 years registered

    Join Date
    Jan 2007
    Posts
    12
    Helped
    0 / 0
    Points
    1,630
    Level
    9

    Re: SMS and GPRS help for SIM300

    On continuous operation of my system, i am not able to connect to the server and send data always. My system is designed to send data every 15min, some time connection establishes, sometimes not. is this how GPRS is (connection depends on the network traffic?).

    Reliability is what i am concerned of right now?



    •   Alt2nd March 2011, 10:35

      advertising

        
       

  8. #8
    Newbie level 5
    Points: 578, Level: 5

    Join Date
    Sep 2012
    Location
    Bangalore,India
    Posts
    10
    Helped
    1 / 1
    Points
    578
    Level
    5

    Re: SMS and GPRS help for SIM300

    hi gokkul,

    I saw your above post,I am also doing the same project, pls give some guidence about that Do operators in India support SMS over GPRS? and thanks in advance..



--[[ ]]--