What's changed:

System PR

• IDF release/v5.5 by me-no-dev in #12018

CI & testing

• fix(ci): Fix IDF examples compilation when changing source files by lucasssvaz in #12001

Documentation

• feat(docs): Add AI chatbot by P-R-O-C-H-Y in #12002

Libraries

Matter

• fix(matter): IDF 5.4 CI error with ESP_OpenThread Include by SuGlider in #11988
• fix(matter): Update ESP Border to ESP Thread in diagram by SuGlider in #11989
• feat(matter): Adds doc URL ref to examples README.md files by SuGlider in #11997

Network

• feat(net): Add ETH handle to events and data to lost_ip by me-no-dev in #11986
• feat(net): Add method Network.isOnline() by me-no-dev in #12000
• feat(network): Adds Network Library documentation by SuGlider in #11999
• fix(network): Fix getting fallback DNS server by szerwi in #12013

Zigbee

• feat(zibgee): Add IASZone enroll request and restore + error check fixes by P-R-O-C-H-Y in #11990
• feat(zigbee): Update esp-zigbee-sdk to latest 1.6.8 by P-R-O-C-H-Y in #12017

OpenThread

• feat(openthread): adds arduino openthread library documentation by SuGlider in #11991
• feat(openthread): adds examples README.md files by SuGlider in #11996

Peripherals

RMT

• feat(rmt): improves RMT documentation by SuGlider in #11992

SDMMC

• fix(sdmmc): Fix iomux pin initialization by P-R-O-C-H-Y in #11998

Serial UART

• feat(serial_uart): adds Serial (UART) documentation by SuGlider in #11993

UDP

• feat(udp): Allow to change the async_udp task stack size by mathieucarbou in #12003

WebServer

• feat(hosted): Add OTA and version functionality to esp-hosted by me-no-dev in #11936

WiFi

• fix(wifi): Fix WiFi.disconnect(true, true) not working by me-no-dev in #12004

Others

• fix(ppp): Fix PPP.end() causing exception by me-no-dev in #11987

Full Changelog: 3.3.3...3.3.4