hid_report_stats.py

#!/usr/bin/env python

import sys
from scapy.utils import rdpcap
from scapy.packet import Raw
from scapy.layers.bluetooth import L2CAP_Hdr
from statistics import mean, stdev

def get_hid_pkt_intervals(packets):
    prev = 0
    first = 1
    intervals = []
    for pkt in packets:
        if pkt.haslayer(L2CAP_Hdr) and pkt.haslayer(Raw) and pkt[Raw].load[0] == 0xA1:
            cur = pkt.time
            interval = cur - prev
            prev = cur
            if first:
                first = 0
                continue
            intervals.append(interval * 1000)
    return intervals


def print_stats(intervals):
    print("Samples: {}".format(len(intervals)))
    print("Average: {:.6f} ms".format(mean(intervals)))
    print("Max    : {:.6f} ms".format(max(intervals)))
    print("Min    : {:.6f} ms".format(min(intervals)))
    print("Std Dev: {:.6f} ms".format(stdev(intervals)))


if __name__ == '__main__':
    print_stats(get_hid_pkt_intervals(rdpcap(sys.argv[1])))