-- | A port stats value with all fields missing.
nullPortStats :: PortStats
nullPortStats = PortStats { 
  portStatsReceivedPackets      = Nothing,
  portStatsSentPackets          = Nothing,
  portStatsReceivedBytes        = Nothing,
  portStatsSentBytes            = Nothing,
  portStatsReceiverDropped      = Nothing,
  portStatsSenderDropped        = Nothing,
  portStatsReceiveErrors        = Nothing,
  portStatsTransmitError        = Nothing,
  portStatsReceivedFrameErrors  = Nothing,
  portStatsReceiverOverrunError = Nothing,
  portStatsReceiverCRCError     = Nothing,
  portStatsCollisions           = Nothing
  }
nullPortStats :: PortStats
nullPortStats = PortStats { 
  portStatsReceivedPackets      = Nothing,
  portStatsSentPackets          = Nothing,
  portStatsReceivedBytes        = Nothing,
  portStatsSentBytes            = Nothing,
  portStatsReceiverDropped      = Nothing,
  portStatsSenderDropped        = Nothing,
  portStatsReceiveErrors        = Nothing,
  portStatsTransmitError        = Nothing,
  portStatsReceivedFrameErrors  = Nothing,
  portStatsReceiverOverrunError = Nothing,
  portStatsReceiverCRCError     = Nothing,
  portStatsCollisions           = Nothing
  }
nullPortStats = PortStats { 
  portStatsReceivedPackets      = Nothing,
  portStatsSentPackets          = Nothing,
  portStatsReceivedBytes        = Nothing,
  portStatsSentBytes            = Nothing,
  portStatsReceiverDropped      = Nothing,
  portStatsSenderDropped        = Nothing,
  portStatsReceiveErrors        = Nothing,
  portStatsTransmitError        = Nothing,
  portStatsReceivedFrameErrors  = Nothing,
  portStatsReceiverOverrunError = Nothing,
  portStatsReceiverCRCError     = Nothing,
  portStatsCollisions           = Nothing
  }