| The PING protocol layer retrieves the initial membership (used by the GMS when started
by sending event FIND_INITIAL_MBRS down the stack). We do this by mcasting PING
requests to an IP MCAST address (or, if gossiping is enabled, by contacting the GossipRouter).
The responses should allow us to determine the coordinator whom we have to
contact, e.g. in case we want to join the group. When we are a server (after having
received the BECOME_SERVER event), we'll respond to PING requests with a PING
response. The FIND_INITIAL_MBRS event will eventually be answered with a
FIND_INITIAL_MBRS_OK event up the stack.
The following properties are available
property: gossip_host - if you are using GOSSIP then this defines the host of the GossipRouter, default is null
property: gossip_port - if you are using GOSSIP then this defines the port of the GossipRouter, default is null
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