LLDP Support on Network interface (IDFGH-13715)

[sramrajkar]

Is your feature request related to a problem?

We use ESP32 and ESP32S3 in industrial and building automation space to drive a gateway product. We are now being asked to support LLDP on atleast our ethernet interfaces which are 2 W5500.

Describe the solution you'd like.

Minimum LLDP feature set is implemented so that other devices can find ESP32`s interfaces on the network.

Describe alternatives you've considered.

Looks like there is a linux daemon for this. Not sure how much effort is it to port it to esp32 idf

https://github.com/lldpd/lldpd

ChatGPT also thinks it can implement this on LwIP but I have not tried it code.

Additional context.

With ESP32S3 having a lot of horse power it can be used in industrial space without much issue. However industrial protocols have some of these networking requirements that IDF or LwIP currently does not cover. Instead of hacking something together I feel official IDF support can improve adoption in the industrial space.