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## josx.rcxcomm
Class LNPHandler

    java.lang.Object
      josx.rcxcomm.PacketHandler
          josx.rcxcomm.LNPHandler

    public class LNPHandler

extends PacketHandler

A Packet handler that implements the outer LNP packet format. It uses the Tower call to send and receive LNP packets.

Field Summary

Fields inherited from class josx.rcxcomm.PacketHandler
`lowerHandler`

Constructor Summary
`LNPHandler(java.lang.String port)` Creates an LNP packet handler and opens the tower

Method Summary
`void` | `close()` Close the Tower.
`int` | `getError()` Get the last error on the Tower
`boolean` | `isAddressing()` Test if last received packet is addressing (or integrity)
`boolean` | `isPacketAvailable()` Check if a packet is available
`int` | `receivePacket(byte[] buffer)` Receive a packet.
`boolean` | `sendPacket(byte[] packet, int len)` Send a packet.
`void` | `setListen(boolean listen)` Set or unset the listen flag to keep a PC serial tower alive

Methods inherited from class josx.rcxcomm.PacketHandler
`isAckAvailable, open, receiveAck, reset`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### LNPHandler

    public LNPHandler(java.lang.String port)

  Creates an LNP packet handler and opens the tower

Method Detail

### isAddressing

    public boolean isAddressing()

  Test if last received packet is addressing (or integrity)

  Returns:
    true if an addressing packet, false if an integrity packet

### getError

    public int getError()

  Get the last error on the Tower

  Overrides:
    `getError` in class `PacketHandler`
  Returns:
    the error number, or zero for success

### setListen

    public void setListen(boolean listen)

  Set or unset the listen flag to keep a PC serial tower alive

  Overrides:
    `setListen` in class `PacketHandler`
  Parameters:
    `listen` - true to set listen mode, else false

### sendPacket

    public boolean sendPacket(byte[] packet,
                              int len)

  Send a packet.

  Specified by:
    `sendPacket` in class `PacketHandler`
  Parameters:
    `packet` - the bytes to send
    `len` - the number of bytes to send
  Returns:
    true if the send was successful, else false

### receivePacket

    public int receivePacket(byte[] buffer)

  Receive a packet.

  Specified by:
    `receivePacket` in class `PacketHandler`
  Parameters:
    `buffer` - the buffer to receive the packet into
  Returns:
    the number of bytes received

### isPacketAvailable

    public boolean isPacketAvailable()

  Check if a packet is available

  Specified by:
    `isPacketAvailable` in class `PacketHandler`
  Returns:
    true if a Packet is available, else false

### close

    public void close()

  Close the Tower.

  Overrides:
    `close` in class `PacketHandler`

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