* Reconstruct Audio Code * Remove old IoT implementation * Add MQTT-UDP documentation * OTA升级失败时,可以继续使用
* add EchoEar Co-authored-by: Qin Feng <qingfeng@espressif.com> * feat: use new display backlight API * feat: use MCP protocol * remove yuying lcd * add echoear README.md --------- Co-authored-by: NingYuxiang <ningyuxiang@espressif.com> Co-authored-by: Qin Feng <qingfeng@espressif.com>