Limit UDP broadcast to interfaces that are up and have broadcast addresses.
Limit UDP broadcast to interfaces that are up and have broadcast addresses.

SendMsg fails with `EINVAL` on iOS if this criteria is not met.

openweave/openweave-core,openweave/openweave-core,openweave/openweave-core,openweave/openweave-core,openweave/openweave-core,openweave/openweave-core