** Overview
Directory Layout: xbee_secure/ Cargo.toml src/ lib.rs serial.rs framing.rs keys.rs replay.rs handshake.rs secure_packet.rs src/bin/ sender.rs receiver.rs keys/ sender_ed25519.key (auto-generated if missing) sender_ed25519.pub (auto-generated) receiver_ed25519.key (auto-generated if missing) receiver_ed25519.pub (auto-generated) authorized_sender.pub (copy sender pub here for receiver) authorized_receiver.pub (copy receiver pub here for sender)