AT Command Tester: the free online software tool to test GSM AT commands

By on February 20, 2013
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AT command tester is a free online software tool that is used to test AT commands and other functionalities of GSM modems. The friendly user interface allows developers to

  • Configure and connect to modem ports
  • Send single or batch of AT commands
  • Perform modem diagnostics
  • Establish 3G or GPRS call
  • Collect and save modem logs



Port Configuration

AT Command Tester uses Java-based serial drivers to interface to the modem. The ‘Find Ports’ button will automatically find all ports available in the system. The user can connect the appropriate modem port with the desired port speed.

Command mode

After connecting successfully to the modem, users can send single AT commands under ‘Command Mode’ tab. The drop down provides a list of AT commands with description and examples. The users can modify or enter their own AT command in the text box.




Script Mode

Users can send batch of AT commands under the ‘Script Mode’ tab. They can also save and load the script from the local machine. Users can develop their own scripts for specific set of tasks such as call setup , send SMS, HTTP access etc. Users can also include descriptive comments in their script.




Users can perform basic troubleshooting of the modem under the ‘Diagnostics’ tab. Here the AT Command Tester tool sends the required AT commands and provides descriptive output about the state of the modem.



Data Call

The ‘Data Call’ tab provides the interfaces to setup data call with the GSM network. ‘Get PDP Contexts’ button will list all the PDP context profiles stored on the SIM. Users can also add or update new PDP context profile. Users can then connect to the selected profile. AT Command Tester will first check whether the device is registered on the network. If so, it will attach and connect to the network with the selected PDP context credentials.

More feature additions such as voice call, SMS, Phone book functions, HTTP, FTP, TCP/IP are planned for AT Command Tester tool. Suggestions from this blog readers are also welcome.

About provides useful information to M2M application developers about modules, M2M software, certification etc.

About Boris Landoni

Boris Landoni is the technical manager of Skilled in the GSM field, embraces the Open Source philosophy and its projects are available to the community.


  1. wangyuanwill

    April 22, 2013 at 2:08 PM

    how to use this software? I installed it but i can not find it ?how can i pull out this interface?

  2. ER

    June 13, 2013 at 11:37 AM


    • BorisLandoni

      June 13, 2013 at 2:36 PM

      It’s an online program

      • Bryan

        October 24, 2014 at 7:41 PM

        Is it too difficult to set up an offline program?

        • BorisLandoni

          November 4, 2014 at 4:17 PM

          I can suggest you to write to the developer

  3. Brian O'Sullivan

    September 18, 2013 at 6:44 AM

    Crashes my browser when I try to connect to the tool. Win 7, 64 bit OS.

  4. ebtihaj

    April 28, 2014 at 9:26 AM

    can i get its source code?

  5. Gabriel

    March 17, 2015 at 4:16 PM

    Java 8 will not allow me to run it once or add it as an exception. (Windows 8.1 64b, Chrome)

    • chrisamr

      September 1, 2016 at 12:10 PM

      Java will not accept this program as a security risk, it is blocked by Java

  6. Kaniz Fatema Shuktara

    April 22, 2016 at 7:33 PM

    why can’t find the port?

  7. waynemcl

    June 15, 2017 at 7:50 AM

    There’s a java permissions requirement:

    (I do IoT development)

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