mdns queries did not work properly when send imeadiately after set_hostname, which cuased reinit of pcb and therefore restarted probing, so search packets were blocked until probing finished
closes#2507, closes#2593
1) two events AP_STOP, AP_START shortly after each other may cause IGMP config on already stopped netif
2) not properly locked sending packets to queue from timer task
closes#2580
Allocation was happening later, causing possible use of stack variables
of caller function, which could be invalid.
Signed-off-by: Piyush Shah <piyush@espressif.com>
Send the Goodbye packet while removing an mDNS service as an "Authoritative" packet so
that the listeners remove the service from their records immediately.
* Change snprintf for strlcat does not complain w/gcc7.2.0 and it is safer, thanks @projectgus
* Use proper quotes for character literals
Merges https://github.com/espressif/esp-idf/pull/1163
Old behavior assumes message compressed when any of 2 most significant bits are set,
But in fact Message compressed only when both those bits are set to 1.
Also maximal label length should be 63 bytes.
