mdns add browse support (IDFGH-12512)

[zwx1995esp]

This MR introduces a new query mode: browse(like the avahi-browse -r _test._tcp).

mdns_browse_new is used for starting a browse, it will add a browse in the link list of _mdns_server, if there is some service start or leave, it will be notified by the callback passed in the API. When the service is leaved, the ttl will be 0, the related result will be freed after syncing to the notifier callback.

mdns_browse_delete is used for stop the browse query and free the related memory.

All apis are followed the mdns action mechanism.

[jonsmirl]

The algorithm for doing this is described in the MDNS specification. Is it being followed?
https://datatracker.ietf.org/doc/html/rfc6762#section-5.2

I just encountered this inability to monitor when trying to build a matter controller. esp-matter needs this feature.

[zwx1995esp]

The algorithm for doing this is described in the MDNS specification. Is it being followed? https://datatracker.ietf.org/doc/html/rfc6762#section-5.2

I just encountered this inability to monitor when trying to build a matter controller. esp-matter needs this feature.

No, I just send the query once and then listen for the service which has been queried.

[jonsmirl]

For esp-matter with just need to do a query on something like _matterc._tcp and then monitor add/deletes. This is the event interface. https://github.com/project-chip/connectedhomeip/blob/master/src/lib/dnssd/platform/DnssdBrowseDelegate.h

There is no requirement to implement everything in the MDNS spec, all that is needed is enough to implement this interface.

[chshu]

@jonsmirl This MR introduces a continuous browse feature which is similar to avahi-browse, it will send the query once, then monitor the incoming responses, and trigger the callbacks immediately once the service changes.

It was required by Thread BR project, while it should also works for your Matter controller use case. Let us know If there are any functionalities missing.

[david-cermak]

Thanks for posting these changes and implementing browse support. This LGTM! I like the way you treat browsing separately from the searching and other features. It may be helpful to reuse some code from the searching routines, but this change is less invasive and more compact 👍

just left few nitpicks and of course we need to test the changes properly.

[zwx1995esp]

just left few nitpicks and of course we need to test the changes properly.

Hi, @david-cermak @gabsuren . I do these tests manually in my locally.

And in my local test, I test for these scenarios manually:

1. Start browsing with the service _test._udp on S3, and start/stop publishing these services via linux host using avahi

(S-A) avahi-publish-service test _test._udp 12347 test=4444 dn="for_ci_br_test1010"
(S-B) avahi-publish-service aaa _test._udp 20617 zwx=esp dn="for_ci_br_test"

case-1: Start browsing with the service _test._udp, start (S-A), stop (S-A), Stop browsing with the service _test._udp (check the heap usage during the test).
case-2: Start browsing with the service _test._udp, start (S-A), start (S-B), stop (S-A), stop (S-B), Stop browsing with the service _test._udp (check the heap usage during the test).
case-3: Start browsing with the service _test._udp, start (S-A), start (S-B), stop (S-B), stop (S-A), Stop browsing with the service _test._udp (check the heap usage during the test).
case-4: start (S-A), start (S-B), start browsing with the service _test._udp, stop (S-B), stop (S-A), Stop browsing with the service _test._udp (check the heap usage during the test).
2. Start browsing with the service _test._udp and _testtt._udp, and start/stop publishing these services via linux host using avahi

(S-A) avahi-publish-service test _test._udp 12347 test=4444 dn="for_ci_br_test1010"
(S-B) avahi-publish-service aaa _test._udp 20617 zwx=esp dn="for_ci_br_test"

(S-C) avahi-publish-service testxxx _testtt._udp 1234 test=1235 dn="for_ci_br_test"

case-1: Start browsing with the service _test._udp, Start browsing with the service _testtt._udp, start (S-A), stop (S-A), , start (S-C), stop (S-C), Stop browsing with the service _test._udp, Stop browsing with the service _testtt._udp (check the heap usage during the test).
case-2: Start browsing with the service _test._udp, Start browsing with the service _testtt._udp, start (S-A), start (S-B), start (S-C), stop (S-A), stop (S-B), stop (S-C), Stop browsing with the service _test._udp , Stop browsing with the service _testtt._udp (check the heap usage during the test).
3. The API mdns_browse_new and mdns_browse_delete
case-1: Start browsing with the service _test._udp for several times, check the heap usage during the test.
case-2: Stop browsing with the service _test._udp for several times, check the heap usage during the test.
case-3: Start browsing with the service _test._udp, then sop browsing with the service _test._udp. Rerun for several times, check the heap usage during the test.

All the test case seems work fine in my local test env.

[david-cermak]

LGTM!