A low cost hardware device was developed to control multiple SIM cards via a web interface.

Using just a few watts of power, the device enables you to send and receive SMSs through a web interface from anywhere in the world. You will also be notified of any incoming SMSs through a Telegram bot.

The hardware device consists of an embedded single board computer with multiple LTE modems connected through a UART interface. A software daemon runs on the device and communicates with the LTE modems through AT commands. The daemon transmits the data to a frontend interface in real time through WebSockets. A reverse proxy with zero trust authentication was configured to ensure confidentiality and security of the text messages.