The Null ALP causes no action to be taken. It may be used for handshaking/acknowledgement purposes during Datastream Dialogs or other means of ALP usage. Therefore, it is incredibly simplistic.
Null ALP follows the standard form of the DASH7 Mode 2 Built-in Application Layer Protocols. The record structure is defined as follows:
|Record Flags||Record Length||ALP ID||ALP Command|
|1 Byte||1 Byte||1 Byte||1 Byte|
|(per M2ALP spec)||(N: 0-255)||(0x00)||(ignored)|