How to add user-defined AT commands¶
AT firmware is based on the Espressif IoT Development Framework (ESP-IDF). Espressif Systems’ AT commands are provided in
libat_core.a, which is included in the AT BIN firmware.
Examples of implementing user-defined AT commands are provided in main/interface/uart/at_uart_task.c.
- The total length of an AT command cannot be longer than 256 bytes.
- Only alphabetic characters (A~Z, a~z), numeric characters (0~9), and some other characters (
_) are supported when naming user-defined AT commands.
- The structure,
esp_at_cmd_struct, is used to define four types of a command.