The AT Protocol is a common method for communicating with modems for WiFi, Bluetooth, LTE, Cat.M1 via serial protocols. This solutions is the full source code for a UART connected WiFi modem AT Protocol driver, implemented in C and without any delay functions.
This solutions is designed to work with cooperative multi-tasking systems without an RTOS (mainloop systems) such as bare-metal microcontrollers.
The solution handles:
• AT Command transmit
• AT responses with and without payload
• AT Error conditions
• Unsolicited messages from device
• Binary transfer mode
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