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6.8

How to establish a GPRS connection using a Simcom sim300 module

Asked by Subash_Iyer in General Packet Radio Service (GPRS), TCP/IP, Microsoft Virtual Server, Miscellaneous Networking, Windows Networking

Tags: GPRS, Simcom, TCP, IP, server

Hi,
I am using a Simcom 300 module to connect my PC over the GPRS to a remote server to send data. The PC would later be replaced by microcontroller based equipment for remote a monitoring application.
I have tried using the data as a TCP pack thru IP and also by the APN but am facing the following problem.
My service provider is Airtel and their APN is airtelfun.com. The IP address of airtelfun.com is 100.1.200.99:8080
The IP address of my server is 192.168.1.18:2020. This is not actually a static IP but a virtual server that I have set up using a software called TCPIPECHO.
When I connect the module to the IP address of airtelfun.com. i.e. 100.1.200.99:8080, I am getting a CONNECT OK after the execution of the AT+CIPSTART command. However, when I connect to any other IP address, I get a TCP CONNECTING message and a CONNECT FAIL message following it.
As far as I can understand, the modem is successfully connecting to the network and is also being given an IP address. However, it is unable to establish a TCP connection to any IP apart from that of the service provider.
I have also tried using the SIM card in a mobile phone to verify whether there are any restrictions on access by the service provider. I am able to browse all sites over the mobile which confirms that there are no such access restrictions. I have also verified this with my service provider.
I do hope someone would be able to solve this problem.
Subash Iyer

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How to establish a GPRS connection using a Simcom sim300 module

Asked by Subash_Iyer in General Packet Radio Service (GPRS), TCP/IP, Microsoft Virtual Server, Miscellaneous Networking, Windows Networking

Tags: GPRS, Simcom, TCP, IP, server

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