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Current neighbor discovery uses binding to a local udp port with multicast. Thus two dtn node on the same host can't discover themselves and also cannot bind on the same port.
This PR Implements neighbour discovery over mDNS, this doesn't require any binding to local port, the service messages encapsulate all eid and services in a similar fashion to the beacon with udp multicast discovery.
I also Added new options for dtnd to select which neighbouring discovery protocol to use.