code: public static DatagramPacket buildPacket(PacketType type, ByteBuffer deviceName, ByteBuffer payload) {
          ByteBuffer content = ByteBuffer.allocate(0x1f + payload.remaining());
          content.put(getMagicHeader());
          content.put(type.protocolValue);
          content.put(deviceName);
          content.put(payload);
          return new DatagramPacket(content.array(), content.capacity());
      }
docs: Build a standard-format UDP packet for sending to port 50001 or 50002 in the protocol.
  
  @param type the type of packet to create.
  @param deviceName the 0x14 (twenty) bytes of the device name to send in the packet.
  @param payload the remaining bytes which come after the device name.
  @return the packet to send.