Amazon Dash Button ARP listener script (not written by me)

dash-listen-3.py

import socket
import struct
import binascii

# Written by Bob Steinbeiser (https://medium.com/@xtalker)

rawSocket = socket.socket(socket.AF_PACKET, socket.SOCK_RAW,
                          socket.htons(0x0003))
MAC = '74c24671971c'

while True:
    packet = rawSocket.recvfrom(2048)

    ethernet_header = packet[0][0:14]
    ethernet_detailed = struct.unpack('!6s6s2s', ethernet_header)

    arp_header = packet[0][14:42]
    arp_detailed = struct.unpack('2s2s1s1s2s6s4s6s4s', arp_header)

    # skip non-ARP packets
    ethertype = ethernet_detailed[2]
    if ethertype != '\x08\x06':
        continue

    source_mac = binascii.hexlify(arp_detailed[5])
    dest_ip = socket.inet_ntoa(arp_detailed[8])

    if source_mac == MAC:
        print "Dash button pressed!, IP = " + dest_ip

Awesome Stuff!

Anyone else seeing two IPs each time that you press your Dash?

Thanks again - everything worked so easy (and thanks for posting here - the indents really can be a pain).

@ibrahima How do I find the mac address using this?

I have tried running this code on my RPI 3 but it doesn't detect my dash button presses. I am running wireshark simultaneously, and I do see the ARP packet on it every time I press the dash button. This shows me the 0x0806 ARP type, which allows me to see the (Dash button) sender MAC address: "AmazonTe_..." as well as IP address. So all seems to be working as expected by the dash button, as observed by my Windows 10 PC. It seems that the PI program is not seeing these packets. The RPI does receive some ARP packets on my local network, just not those sent by the Dash button.