FIX - AsyncUDP joinMulticastGroup does not work if interface is not specified#2279

Merged

me-no-dev merged 1 commit intoespressif:masterfrom

forkineye:fix-asyncudp_joinMulticastGroup

Jan 6, 2019

Commits on Jan 5, 2019

Added support for using TCPIP_ADAPTER_IF_MAX to join igmp groups on all
forkineye
committed