The PcapReader and PcapWriter apps can be used to inject and log raw
packet data into and out of the app network using the
Libpcap File Format.
PcapReaderreads raw packets from a PCAP file and transmits them on its
output port while PcapWriter writes packets received on its input
port to a PCAP file.
DIAGRAM: PcapReader and PcapWriter
+------------+ +------------+
| | | |
| PcapReader *---> output input ---->* PcapWriter |
| | | |
+------------+ +------------+
Both PcapReader and PcapWriter expect a filename string as their
configuration arguments to read from and write to respectively. PcapWriter
will alternatively accept an array as its configuration argument, with the
first element being the filename and the second element being a mode argument
to io.open.