handleServerPacket method
override
    Implementation
@override
Future<PacketResponse> handleServerPacket() async {
  CompoundTag tag = CompoundTag();
  tag.put("pong", StringTag.valueOf(Platform.version));
  S2CResponse response = S2CResponse();
  response.contents = tag;
  PacketResponse reply =
      PacketResponse(replyDataTag: response.encodeTag().asCompoundTag());
  return reply;
}