/**
* Prepare a Packet to be sent over the wire.
* This command does not return anything, instead it will add new items to a JsonObject representing the data to be
* sent over the wire. Upon serializing the AdminAnnounce packet, it will be ready for transmission over the wire to
* other servers. Note that this method will never remove data, but it will overwrite existing data with any of the
* following keys: message, senderId, senderName, and serverIp. Be sure that none of these values already exist in