This is a telnet server without root permission, also it can change your adb debug connection from USB cable to network/WiFi(for example: adb connect IPAddress).
If you install it on Android 3.1 or greater, please do run this app at least once after installation or update, then the Telnetd auto boot service can be registered to the Android system.

In some platforms, maybe you should root your device first then turn on Rooting Adb option in the app setting page to make adb via network work. You can try Superuser and Z4Root to root your device.