What Is Combo-AT?

Combo-AT is an IoT application firmware developed by AI-Thinker that is ready for mass production, designed to reduce customer development costs and accelerate time to market. With Combo-AT commands, you can quickly join wireless networks, connect to cloud platforms, enable data communication, and implement remote control—truly achieving the Internet of Everything through wireless connectivity.

In Combo-AT firmware, the AI-Thinker module acts as a slave device and the MCU acts as the host. The MCU sends AT commands to the module to control different operations and receives AT responses from the module. Combo-AT provides a wide range of AT commands, such as Wi-Fi commands, TCP/IP commands, Bluetooth LE commands, Bluetooth commands, MQTT commands, HTTP commands, GPIO operation commands, and more.

Combo-AT Overview

AT commands start with “AT” (Attention) and end with a new line (CR LF). Each command returns an OK or ERROR response indicating the final execution result. Note that all AT commands are executed serially—only one command can run at a time. When using AT commands, wait for the previous command to complete before sending the next one. If a new command is sent before the previous one finishes, a cmd is running... message is returned.

By default, the MCU connects to the AI-Thinker module via UART to send AT commands and receive AT responses.