Espressif Systems ESP8266EX - 4.2. Download Firmware; 4.3. Debugging AT Commands via UART

CONFIDENTIAL
Espressif
Systems
ESP8266EX Beginner’s Guide
3.3.3. Transparent Serial!
Example: Device’s MCU as host, connects and transmits data to ESP8266EX through
UART. ESP8266EX then transmits via W-Fi destination address, working in pass-through
mode."
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