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doc: Added pcapng documentation

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kleest committed May 7, 2019
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# pcapng
## Overview
This document does not describe the pcapng file format, but its usage in NFCGate. For information about pcapng see the [official format documentation](https://github.com/pcapng/pcapng).

## Structure
NFCGate uses two interface description blocks to dump NFC traffic:

1. ISO 14443 data encoded as linktype ISO14443 (interface 0)
2. Initial card data (NCI configuration stream) encoded as DLT_USER_0 (interface 1)

Wireshark contains a dissector for ISO 14443 data, allowing to view and examine NFCGate dumps. Newer versions of Wireshark (v2.9.0+) are also able to dissect ISO 7816 as a subdissector of ISO 14443. At this time, no dissector for NCI configuration streams exists.

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