sniff.sh

#!/bin/bash
set -e

STAMP=`date +%y%m%d_%H-%M-%S`

pm3 -c 'hf 14a sniff'

pm3 -c 'trace list -t 14a -x' 2>/dev/null \
| text2pcap -t "%S." -l 264 - - 2>/dev/null \
| tshark -r - -T json \
| tee trace_$STAMP.json \
| jq -r '.[]._source.layers.iso14443."Message: I-block".data."data.data" | select(. != null)' \
| tr -d ':' \
| tee trace_$STAMP.txt \
| awk -f <(cat - <<-'EOD'
{
    if (NR % 2) {
        # Odd lines
        if (length($0) < 8) {
            print ">> " $0
        } else {
            print ">> " substr($0, 1, 8) " " substr($0, 9)
        }
    } else {
        # Even lines
        if (length($0) <= 4) {
            print "<< " $0
        } else {
            print "<< " substr($0, 1, length($0) - 4) " " substr($0, length($0) - 3)
        }
    }
}
EOD
)