[TriEmbed] Amazon Dash button simple detection
Pete Soper
pete at soper.us
Sat Jul 23 22:58:24 CDT 2016
To fill in a few blanks, the scapy-dependent Dash detector involving
diaper logging that a ton of other implementations copy (including the
one Rod pointed to) is here
<https://medium.com/@edwardbenson/how-i-hacked-amazon-s-5-wifi-button-to-track-baby-data-794214b0bdd8#.1opwy0u3c>.
For whatever reason (router seems the only suspect) that code does not
work for me except for the very first time a Dash is used, at the point
the router sees it's MAC address and gives it an IP via DHCP.
Rather than figure out why it doesn't work for me or try a similar
implementation like the one Rod pointed to, I'm using arpalert
<http://arpalert.org>, a relatively simple program that detects ARP
traffic and executes an arbitrary, configured program with the MAC
address as an argument (example shell script below). It has no
dependencies beyond standard network libraries and is just exactly what
I'm after, and maybe others would find it useful too. But it has to be
built from source and there are a few wrinkles not covered by the
English readme. But for an expedient solution I contend the previous
shell script I shared is as easy as an implementation is likely to get. :-)
Here's an example program that arpalert can invoke when a Dash is
pushed. The "button" variable assignment could be replaced by any
arbitrary button-specific action, for instance Python code that does the
whatsit transaction on the IFTTT Maker Channel, Raspberry Pi code to
pull a GPIO line, etc. While I'm testing it the script just logs which
Dash was pushed.
#!/bin/sh
case $1 in
(f0:27:2d:d8:26:ad) button='gatorade1';break;;
(44:65:0d:14:1e:fb) button='playdoh2';break;;
(f0:27:2d:bc:be:65) button='chlorox2';break;;
(f0:27:2d:f9:36:d5) button='gatorade2';break;;
(a0:02:dc:22:57:a7) button='chlorox1';break;;
(f0:4f:7c:e8:ec:60) button='solidgold1';break;;
(44:65:0d:21:d8:45) button='playdoh1';break;;
(74:c2:46:9a:13:bc) button='solidgold2';break;;
esac
date >>/tmp/log
echo $button >>/tmp/log
-Pete
On 07/23/2016 04:53 PM, Pete Soper via TriEmbed wrote:
> In the past couple days I've looked at a lot of different
> implementations. I'm not willing to spend the time to determine
> whether that one suffers the same issue that keeps the other
> scapy-dependent implementation from working here. IMO arpalert
> <http://www.arpalert.org/arpalert.html> is an excellent tool for this
> application.
>
> -Pete
>
> On 07/23/2016 04:42 PM, Rodney Radford wrote:
>> Pete,
>>
>> Have you seen this method that simply relies on the ARP requests by
>> MAC address? Similar to where you are heading, but this is already
>> complete and appears ready to us..
>>
>> https://familab.org/2016/02/hacking-the-amazon-dash-button-to-make-a-simple-cheap-iot-place-anywhere-networked-button-3/
>>
>>
>> On Sat, Jul 23, 2016 at 4:02 PM, Pete Soper via TriEmbed
>> <triembed at triembed.org> wrote:
>>
>> OK, after wading through some cosmically complex implementations
>> of "detect the button push" and finding the trivial Python
>> program of the seminal how-to involving baby diaper use only
>> works in my house for the very first button press, I wondered if
>> these things would respond to pings while they're winking and
>> blinking. They do. Then I wondered if they remember to request
>> the same IP address over and over. They do. So, in my house,
>> where the DHCP environment is very stable for the main LAN, I can
>> arrange for a completely reliable mapping of button to IP
>> address. So I can just use the shell script below for a trivial
>> means of detecting a button. The script puts no measurable load
>> on the computer I tried it on. I'm arranging a proper scheme that
>> keys off MAC addresses to be immune to DHCP behavior using
>> arpalert, but in the meantime I thought the group might find this
>> script amusing. (I'll publish the arpalert-based scheme when I've
>> worked out some patches to that code to get a few issues out of
>> my face and some utilities to automate the process a bit).
>>
>> To use this little script I I set up a button as usual and either
>> use the diaper-logger's Python script or simply look at the
>> router's admin interface to see the IP address dispensed. I then
>> put that in my /etc/hosts file with a name and use that in the
>> script below. Making this script general (e.g. taking the IP and
>> text/action as parameters) would of course be the next step with
>> this approach. Anyway, this script might be of interest to folks
>> that just want to play vs installing scapy or a hundred
>> Javascript modules. I' about 99 3/4% sure this would work on
>> Windows using Cygwin.
>>
>> One interesting side effect of setting up a bunch of buttons is
>> that my phone is simply filled with reminders about the fact that
>> I never selected a product for each button. So I would add to the
>> usual instructions out on the net "after setting up the last
>> button, uninstall the Amazon app!"
>>
>> #!/bin/sh
>>
>> while [ /bin/true ] ; do
>>
>> ping -w 1 -c 1 gatorade1 >/dev/null 2>&1
>>
>> if [ $? -eq 0 ] ; then
>>
>> echo "You can get your own Gatorade" | espeak --stdin
>>
>> # make sure we don't double trigger
>>
>> sleep 10
>>
>> fi
>>
>> done
>>
>>
>> -Pete
>>
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>
>
>
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