Join multicast groups for mDNS.

[andy31415]

Problem

MinMDNS was not receiving mDNS multicast queries (unicast would work and so did tests on linux because avahi was auto-joining multicast groups, but esp32 was not working).

Summary of Changes

Join IPv4 and IPv6 multicast groups. Tested on ESP32 and mdns discovery works. IPv6 on esp32 returns 'Not supported'.

[github-actions]

Size increase report for "nrfconnect-example-build" from 5480b66

File	Section	File	VM
chip-lighting.elf	text	224	224
chip-lighting.elf	rodata	72	76
chip-lock.elf	text	228	228
chip-lock.elf	rodata	80	80
chip-lock.elf	shell_root_cmds_sections	-4	-4

Full report output

BLOAT REPORT

Files found only in the build output:
    report.csv

Comparing ./master_artifact/chip-lighting.elf and ./pull_artifact/chip-lighting.elf:

sections,vmsize,filesize
.debug_info,0,619
.debug_loc,0,251
text,224,224
.strtab,0,198
.debug_ranges,0,168
.symtab,0,144
.debug_line,0,134
.debug_abbrev,0,111
rodata,76,72
.debug_str,0,29
.shstrtab,0,-2

Comparing ./master_artifact/chip-lock.elf and ./pull_artifact/chip-lock.elf:

sections,vmsize,filesize
.debug_info,0,619
.debug_loc,0,251
text,228,228
.strtab,0,198
.debug_ranges,0,168
.symtab,0,144
.debug_line,0,134
.debug_abbrev,0,111
rodata,80,80
.debug_str,0,29
.shstrtab,0,-2
shell_root_cmds_sections,-4,-4

Comparing ./master_artifact/chip-shell.elf and ./pull_artifact/chip-shell.elf:

sections,vmsize,filesize

[github-actions]

Size increase report for "gn_qpg6100-example-build" from 5480b66

File	Section	File	VM
chip-qpg6100-lock-example.out	.text	372	372

Full report output

BLOAT REPORT

Files found only in the build output:
    report.csv

Comparing ./master_artifact/chip-qpg6100-lock-example.out and ./pull_artifact/chip-qpg6100-lock-example.out:

sections,vmsize,filesize
.debug_info,0,525
.strtab,0,449
.text,372,372
.debug_loc,0,321
.symtab,0,320
.debug_line,0,115
.debug_abbrev,0,80
.debug_frame,0,48
.debug_str,0,31
.debug_aranges,0,16
.debug_ranges,0,16
.shstrtab,0,3
[Unmapped],0,-372

[github-actions]

Size increase report for "esp32-example-build" from 5480b66

File	Section	File	VM
chip-all-clusters-app.elf	.flash.text	352	352
chip-all-clusters-app.elf	.flash.rodata	72	72

Full report output

BLOAT REPORT

Files found only in the build output:
    report.csv

Comparing ./master_artifact/chip-all-clusters-app.elf and ./pull_artifact/chip-all-clusters-app.elf:

sections,vmsize,filesize
.debug_info,0,687
.flash.text,352,352
.debug_line,0,308
.strtab,0,295
.debug_loc,0,258
.debug_abbrev,0,103
.symtab,0,80
.flash.rodata,72,72
.debug_ranges,0,56
.debug_str,0,29
.shstrtab,0,1
.xt.prop._ZTVN4chip11DeviceLayer37DeviceNetworkProvisioningDelegateImplE,0,-1
[Unmapped],0,-72

Comparing ./master_artifact/chip-pigweed-app.elf and ./pull_artifact/chip-pigweed-app.elf:

sections,vmsize,filesize

[andy31415]

@woody-apple @bzbarsky-apple ?