arp.py

#!/usr/bin/env python

from scapy.all import *
import calendar
import requests
import time
import yaml

last_triggered = {}
with open("buttons.yaml", "r") as stream:
    buttons = yaml.load(stream)

print "Ready"


def arp_display(pkt):
    if 'ARP' in pkt and pkt[ARP].op == 1:  # who-has (request)
        if pkt[ARP].psrc == '0.0.0.0':  # ARP Probe
            mac = pkt[ARP].hwsrc
            if mac in buttons:
                event = buttons[mac]
                ts = calendar.timegm(time.gmtime())
                if event in last_triggered:
                    if ts < (last_triggered[event] + 30):
                        return
                try:
                    requests.post('http://localhost:8123/api/events/'+event,
                                  headers={
                                      'x-ha-access': '****',
                                      'content-type': 'application/json'
                                  })
                    last_triggered[event] = ts
                except:
                    print "Error"
            else:
                print("ARP Probe from unknown device: " + mac)

sniff(prn=arp_display, filter="arp")