Entity / Event Packets

This section documents the small event - style packets sent by the server to keep clients in sync when players disconnect or entities appear / disappear.All packets use the shared 15 - byte header, big - endian encoding, and a 4 - byte CRC32 footer like the other binary messages.

        ##PlayerDisconnectedPacket(`MessageType = 0x1C`) -
        Direction : Server → Client - Payload size : 4 bytes -
                    Payload fields(big - endian)
: - `playerId` (`uint32`)
: Identifier of the player that left -
  CRC32 over `[header + payload]`

  Use : broadcast to every connected client when a player times out
    or disconnects.

           ##EntitySpawnPacket(`MessageType = 0x1D`) -
           Direction : Server → Client - Payload size : 13 bytes -
                       Payload fields(big - endian)
: - `entityId` (`uint32`) - `entityType` (`uint8`) — game -
  defined type / class - `posX` (`float32`) - `posY` (`float32`) -
  CRC32 over `[header + payload]`

  Use : notify clients of a new authoritative entity.Positions must be finite; packet is dropped otherwise.

EntityDestroyedPacket (MessageType = 0x1E)

• Direction: Server → Client
• Payload size: 4 bytes
• Payload fields (big-endian):
• entityId (uint32)
• CRC32 over [header + payload]

Use: announce authoritative removal of an entity. Clients should purge local state for the given entityId.

Notes

• All three packets set packetType = ServerToClient and version = PacketHeader::kProtocolVersion.
• Receivers must validate magic, version, messageType, payloadSize, and CRC before acting.
• sequenceId/tickId are filled by the server; clients can use them for ordering if needed.