Amazon DRS Promise: Never Miss Coffee Break Again! Using Arduino

Coffee fuels our nation, according to this Gallup article

• Just under two-thirds of U.S. adults drink at least one cup a day

• Coffee drinkers average 2.7 cups per day, unchanged from 1999

• A quarter say they’re addicted, but only 10% want to cut back

We all love our coffee. We want constant supply of it – at home, in the office, the gym, everywhere these days. Some people have it for breakfast, morning breaks, lunch, afternoon snacks, after dinner, midnight snacks. Just about anytime of the day.

This led me to experiment on new Amazon Dash Replenishment Services. Coffee is something we use everyday and a great use case for Amazon DRS.

Demonstration

Setup Instructions

This is based from following instructions from this github Repo from Brian Carbonette. https://github.com/andium/AmazonDRS

The instructions are easy to follow. Fit for Hackster devs like us. I used the same library and followed the steps to create an Arduino MKR1000.

SNS Simple Notification Service

Create a developer account with amazon web services

Create SNS Simple Notifications Service. Set up the SNS Topic for Dash Replenishment! You can find those here.

LWA Login With Amazon

Create a login with amazon security profile. Create a security profile to authorize the device to make purchases and log in with Amazon. Fill out the required fields, Security Profile Name,Security Profile Description,Consent Privacy Notice URL,Consent Logo Image

Don’t forget to setup Allowed Origins and Allowed Return URLs. Take note of Client ID and Client Secret.

Dash Replenishment Device

Create a Dash Replenishment Device. Follow this device creation wizard. It’s simple. You need Device Name, Model ID, Image. Then create Slots. You would need to know how to get the Amazon Standard Identification Number (ASIN). Currently only items that are “Shipped and Sold by Amazon” are eligible for DRS.

Take note of your devices Model ID as well as the associated Slot IDs.

Login With Amazon and Authorization Code Grant

To simplify the process, we’re skipping the customer facing app and just hack our registration. Make sure you install postman.

here’s the message to send

https://www.amazon.com/ap/oa?client_id=<CLIENTID>&scope=dash%3Areplenish&scope_data=%7B%22dash%3Areplenish%22%3A%7B%22device_model%22%3A%22<DEVICEMODEL>%22%2C%22serial%22%3A%22<DEVICENAME>%22%2C%20%22is_test_device%22%3A%22true%22%7D%7Dtest&response_type=code&redirect_uri=https%3A%2F%2Fwww.getpostman.com%2Foauth2%2Fcallback

replace these:

<CLIENTID> : amazon Client ID like 
<DEVICEMODEL> is the device model, in my case I named it WalabotPi3
<DEVICENAME> is the name of device, I named it arduino123.

It’s currently setup as a test device so it won’t order. Go thru the process of selecting items for each slots. Complete it.

After that, In the address bar it would look something like this.

https://app.getpostman.com/oauth2/callback?code=<CODE>&scope=dash%3Areplenish

jot down the code, you will use it to setup device. code looks something like “ANdNAVhyhqirUelHGEHA”

Authorization

I cloned this repo, modified AmazonTokens.h file

#define client_id "amzn1.application-oa2-client.c0a2100c1af289b1bf4011c71f6029b3"
#define client_secret "ec48483c54c34a23a71aa8ccb2742902f7d3d00c2dd78fc5ac404eef0111e485"
#define redirect_uri "https%3A%2F%2Fwww.getpostman.com%2Foauth2%2Fcallback"

Zipped up the folder then installed the library in Arduino

Then open this example File>>Examples>>AmazonDRS>>authCodeGran and modify auth_code

#define auth_code "ANNnZjoWYoEIhEJrtLqL";

After running the authCodeGrant, look at the output on serial port. It will return something like this

refresh token = "Atzr|IwEBILdfysz66E9sRHsUobHgfh1X_h-esnBfcCdYjdcCfhGRkZqXujzXSN_3a8yqj5btX1B6NgbrmEX6wax_wmJ7Sgaaa39GbR-6hjDt_tHpKsFXPGwnIhy-14CWuE4oeYDWG4pCvQ4JEMKk2DiAsuwlUtoOVwaEOif1gWErh5rswCJ8mRhaXQ7SJhZB0CWYHm_ZA_PY8xTTVTUcZFqP7iz8kBw5QGDePyOb8NvJvSuBYYkwRQTj-qrytfdcHwMWOJc5QdoyPFpmchSfsMUpMqjDmwVPBfFzb0xZWYKxdUerSeKV1VVlS4Bwl2j-4gHnjHGohUsxau4Bn9SfG9McP-7RqD9Vmk3g--rsfACQ-uVLCJSJ29sBEMNkA5sxh9E9fpTwEw166WY-xBfYa_XB9aAU3n6Fn2yFM0I7ZpPIY1fy0gkdYkFOFD0uAOdoTFDxGXwbBWE";

Which is the refresh token for your device. Now go back and edit AmazonTokens.h at the Arduino Library Folder and change refresh token and authorization_grant_code

static String refresh_token = "Atzr|IwEBIIKDkzgMa5g7O0R1mLZZ6YZo-A1Ae5Ffj6wmV_rPbmAI0oixxTff8g3PN6MrOIEQpB9o_6BlDjiR6gkfRS_82Wp_0GWWvTrtYehcFJ8iKjuqf8n1ff9OrdHQU1_5nW_5Hf5loeIQ88TGazK2wy18UmOXOz1lbl9FDvWVQZl4t_6ggzDfMTVupvNr_ZtDrPm72auzoJIkGmGIM4S1RUw-Ru8X4q-UlzzYYfvRSJnPLAUTM3tTOEkv5e33SzExAaHl0tF22drRqvR1dEVlR_Zzw_IZ-1hzhIAvHrJs22K5dSEmkJKN7g8sD1tUKkn-ErMJhJrMehmvjwanF_O141Z5bVokmOLwiQKq_AYKGz8mJ0WPjBNQ3TbZ1g-3Xp-LqeMcKViNImcl1-_K89K5rupwAh-OmIPP5VhBArvhdeqEnreNU7LVLNoHvvyFB5ypwKQsHLe8";
static String authorization_grant_code = "ANNnZjoWYoEIhEJrtLqL";

Hardware

The hardware is enclosed in a 3D printed enclosure big enough to fit an Arduino Uno sized microcontroller with Wifi Shield. Lots of different hardware can be used. In this case we powered the device with a MKR1000 Arduino microcontroller. The MKR1000 has built in WiFi.

The enclosure is 3d printed, the STL and SketchUp files can be found below for download.

Firmware

Here’s the code. Assign your wifi credentials.

char ssid[] = "XXXXXXXX"; //  your network SSID (name) 
char pass[] = "XXXXXXXX";    // your network password (use for WPA, or use as key for WEP) 

Assign the SlotID and Slot Number

#define slotNumber 1 //This will vary for multi slot devices - dash buttons typically only serve one product/slot 
static String slotStatus = "true"; //boolean which depicts if slot is available for replenishment 
static String slotId = "e2d8d2a3-ecf3-4532-bc02-a1bbb776bdf8";     //unique slot id ex: 0a5038b7-7609-4b81-b87e-3e291f386324 

Push the code to the Device. Watch the serial monitor, you’ll see something like this…

Placing Order 
Requesting Replenishment for slotId b6783dfa-838f-838f-838f-e1eae6049757 
HTTP/1.1 200 OK 
Server: Server 
Date: Sun, 26 Feb 2017 13:32:52 GMT 
Content-Type: application/json 
Content-Length: 170 
Connection: close 
x-amzn-RequestId: 127cd13d-fc28-11e6-ad46-a75ded86f73a 
x-amzn-type-version: com.amazon.dash.replenishment.DrsReplenishResult@1.0 
Vary: Accept-Encoding,User-Agent 
{"detailCode":"ORDER_INPROGRESS","eventInstanceId":"amzn1.dash.v2.o.ci5hNTc5MzlkMC1lZjRkLTQ4MjYtYTNhZC1iZjI3ODIzOGYxYzcuM2IyZjY0ZjItOWE4My00OWI0LTgyOGMtODA5ZTc2ODBhNTRl"}cm: 148 
Average cm: 24 
cm: 148 

That’s it. You’ll receive an email something like this…

https://www.amazon.com/ap/oa?client_id=<CLIENTID>&scope=dash%3Areplenish&scope_data=%7B%22dash%3Areplenish%22%3A%7B%22device_model%22%3A%22<DEVICEMODEL>%22%2C%22serial%22%3A%22<DEVICENAME>%22%2C%20%22