Make interface argument optional
Make interface argument optional

Not specifying an interface listens on all addresses. Since it is not
possible to determine the incoming address of a datagram, the SSDP
server looks up which interface would be used to send the reply when
constructing the reply.

Signed-off-by: Tyler Hall <3cbfc722f51d3bbaca4932ab1bccc6b380a0e19a@gmail.com>

willemneal/leapcast,dz0ny/leapcast,hectoruelo/leapcast,hgl888/leapcast,lastowl/leapcast