MPR Selector detection

The MPR flooding scheme is based on the requirement that nodes have registered what neighbors have chosen them as a MPR. Nodes mark their selected MPR neighbors in HELLO messages by setting the Neighbor Type to be MPR_NEIGH.

Upon receiving a HELLO message, a node checks the announced neighbors in the message for entries matching one of the addresses used by the local node. If an entry has a matching address and the neighbor type of that entry is set to MPR_NEIGH, then an entry is updated or created in the MPR selector set using the main address of the sender of the HELLO message.