Espressif ESP8266 Technical Reference page 9

13.IR Remote Control User Guide
13.1. Introduction to Infrared Transmission
13.1.1. Transmitting
13.1.2. Receiving
13.2. Parameters Configuration
13.3. Functions of Infrared Sample Codes
14. Sniffer Introduction
14.1. Sniffer Introduction
14.2. Sniffer Application Scenarios
14.3. Phone APP
14.4. IOT-device Firmware
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