Packet structure

+---------------------------+
|       Adapter Number      |
|         (1 Octet)         |
+---------------------------+
|           Flags           |
|         (1 Octet)         |
+---------------------------+
|           Payload         |
.                           .
.                           .
.                           .

Description

The adapter number field identifies the interface on which the frame was recorded. On single-interface systems, this will typically be 0.

The bits in the flags field are:

• 0x01 - Direction (0=RX, 1=TX)
• 0x02-0x80 - Reserved

The payload is an NFC Logical Link Control Protocol (LLCP) PDU, as specified by the NFC Forum Logical Link Control Protocol Technical Specification, i.e. an octet containing the DSAP and upper two bits of the PTYPE, followed by an octet containing the lower two bits of the PTYPE and the SSAP, followed by the sequence octet if the frame has sequence numbers, followed by any additional octets of payload.