Therefore, it's necessary to input an AT command at least every minute to keep the connection alive. The TCP interface has a timeout of 1 minute. PuTTY in Windows can be used to connect to the TCP port. A terminal emulator like telnet in Linux/Unix or In order to setup the raw TCP or telnet interface it's necessary to edit the launcher script to configure the TCP port. The console interface can be used directly by launching the emulator in the shell. Two interfaces are supported by the AT Emulator: console and optionally raw TCP/telnet. Therefore, the emulator can be used as an AT tester tool as well. You can play with the emulator without risking to damage the real device. If a physical modem is not available the AT Emulator can come in handy. The AT Emulator can be useful to test various communication software, which require a physical modem device. Sometimes the AT interface is implemented over TCP or telnet. Most GSM/3G/LTE/5G modems implement the AT command set over a serial port interface, for example: RS232 or The AT commands are typically used to interact with phones, modems and other communication devices. The AT Emulator can be used to emulate the AT command set, also known as the Hayes command set, and the GSM AT command set
