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How to validate if device is connected to GPRS | Telit Cinterion IoT Developer Community

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HAhmed's picture
HAhmed

July 13, 2014 - 6:42pm, 10795 views

Dear Sir, Kindly please be informed that i’m using Cinterion-BG2-E. and I need to connect to GPRS then to Connect to server using TCP/IP connection First I fill the data of Network, “APN”,”Password” and “Username” as shown below AT+CPIN? +CPIN: READY OAT^SICS=0,CONTYPE,GPRS0 OK AT^SICS=0,ALPHABET,1 OK AT^SICS=0,”INACTTO”,”65535″ OK AT^SICS=0,APN,”internet.vodafone.net” OK AT^SICS=0,USER,”internet” OK AT^SICS=0,PASSWD,”internet” OK AT^SISS=0,SRVTYPE,TRANSPARENT OK AT^SISS=0,ALPHABET,1 //////////////////////////////////////// Then to Connect to server /////////////////////////////////////// AT^SISC=0 OK AT^SISS=0,ADDRESS,”4.0.0.2:80″ OK AT^SISO=0 OK ^SISW: 0, 1 AT^SIST=0 CONNECT ////////////////////////////// Now I need to now how to validate if device is connected to GPRS successfully first before trying to connect to server. Thank you
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Alopez's picture
Alopez
Jul 14 2014 - 1:38pm
Hi, under my understanding as soon as you recevie a IP adress the device is connected to the IP network!! AT^SISS=0,ADDRESS,”4.0.0.2:80″ OK Anyway with the command at^SISE you can follow the connection status AT^SISE= Regards Alopez

Somewhere over the rainbow!!! Looking for the Oz Land!!!

Jędrzej Gemalto Moderator's picture
Jędrzej Gemalto...
Jul 14 2014 - 2:16pm
Hi, the module is automatically attaching to GPRS and activating PDP context during Internet Service opening the service with AT^SISO=0. ^SISW URC informs that the service has been opened and is ready to accept new data. You can assume that at this point you have the access to the Internet. You can always check current connection status with AT^SICI? (current state, number of services, IP address) and service status with AT^SISI=0. @Antonio thanks for your advice, however please note that AT^SISE is used for Internet Service error status reporting. Regards Jedrzej
HAhmed's picture
HAhmed
Jul 14 2014 - 3:37pm
Dear All, Thank you for your kind reply. After calling command AT^SISO i'm calling AT^SICI=0 AT^SICI=0 ^SICI: 0,2,1,"10.124.14.139" OK But how can i identify if the host is down or the GPRS is down? - Is there any other way to attach to GPRS rather than SISO as it takes time? Thank you
Jędrzej Gemalto Moderator's picture
Jędrzej Gemalto...
Jul 14 2014 - 4:24pm
Use AT^SICI for monitoring GPRS connection status and AT^SISI for monitoring the service. Please refer to chapter 10.2 and 10.4 of AT Command Set. You can manually attach to GPRS with AT+CGATT=1. This will speed up opening the service, but remember that attaching doesn't mean that PDP context is active. You have no network access till PDP context is activated which is performed when AT^SISO is executed. If anything fails you'll get ^SIS URC with proper cause code. Regards Jedrzej
HAhmed's picture
HAhmed
Jul 16 2014 - 6:32pm
Hello, Thank you for your kind reply. Kindly i tried to attach to GPRS Manually and activate PDP . but i got an error as shown below .Also i tried different Sim cards with different operators but i got the same result AT+CREG? +CREG: 0,1 OAT+CGACT? +CGACT: 1,0 OK AT+CGATT=1 OK AT+CGACT=1,1 +CME ERROR: 133 Thank you
Jędrzej Gemalto Moderator's picture
Jędrzej Gemalto...
Jul 16 2014 - 6:53pm
Hello, Internet Services are not intended to work with AT+CGACT command. If you don't want to deactivate PDP context between calls you can change AT^SICS's inactTO parameter which, according to at spec is "number of seconds the bearer remains open although the service no longer needs the bearer connection." So if you set it to 6000, the PDP context will remain active an hour after closure of the last service. Regards Jedrzej
HAhmed's picture
HAhmed
Aug 13 2014 - 3:49pm
Hello, Kindly i have successfully connected to GPRS . i would like to know how to disconnect from GPRS? Thank you
grzegorz.rutkowski's picture
grzegorz.rutkowski
Aug 18 2014 - 3:20pm
Hello, For disconnecting from GPRS please use AT+CGATT=0 Best regards, Grzegorz Rutkowski