Developing firmware for AT-based GSM/GPS modules is a big bottleneck for software development due to the many problems intrinsic to AT-based programming style and the many challenges in dealing with manufacturer specific AT command set. Is a full-featured desktop app for easily controlling with AT commands. It gives you the ability to test HTTP, TCP/UDP, SMS or voice call requests in a single-click. Its multiple manufacturer support, like SIMCom and u-blox, allows you to test different in a single app. With you have a tool that aims to increase your productivity by solving such problems, leading to better time-to-market for your M2M/IoT products.
With this tool---AT command tester, developers can test AT commands, data call, voice. AT command tester is a free online software tool that is used to test AT.