Dash Buttons help you buy stuff on Amazon by simply pressing a button. You can place an order on anything from laundry detergent to soft drinks by pressing one of these. They are essentially free after the first placed order. Amazon recently released the IoT button, which orders absolutely nothing and will cost you $20. Why would anyone buy that? Well, because it is easy and fun introduction to the Amazon IoT platform.
It serves as a perfect introduction to the workflow of the AWS IoT – part of the Amazon Web Services that helps connect devices to the cloud. The Internet of Things has two essential aspects to it. The “things” part are physical devices that interact with the user (a button) or the environment (a temperature sensor). The “Internet” part is the software responsible for processing the data and acting on it (placing an order or sending a text message alert). Getting started with the IoT thus requires working both with hardware and software. Designing and building connected devices might be challenging (although extremely interesting as well). The IoT Button takes care of the hardware part of the equation, and gives you an opportunity to learn the “Internet” side of IoT.
Here is my take on the IoT button workflow – from unpacking to receiving SMS notifications.
Unpacking and AWS set-up
The button comes in a neatly packaged and fully charged. Press it right out-of-the-box, and you will see red flashing light, which means the button has not been set up yet. It has no record of WiFi network SSID and password. There is also no destination to send the data.
First, create the Amazon Web Services Account here. After that you should see AWS console with the multitude of provided services. All we need now is to click AWS IoT icon to go to the AWS IoT homepage.
Create a thing
AWS IoT contains the list of all resources you created, a button to create a them and a link connect AWS IoT button. I found myself confused after following the link and decided to go back. I recommend clicking on the Create a resource.
Choose Create a thing from the list of possible options and give it a name (for example, iot-button). It will have no type and no additional attributes so far. Clicking Create will add a thing, which is a virtual representation of some arbitrary physical device. Next, we need to make sure this newly created “thing” in the cloud is associated with the IoT button we have.
Create a certificate and download private key
The communication between the “virtual” thing and the physical button happens via secure MQTT protocol. This security scheme is using a certificate in combination with the public and private keys. All of them can be created in one simple step. Click on Create a resource again and choose Create a certificate. Certificates have to be activated, you can check the Activate box to do it now (or do it as a separate step later). 1-Click certificate button will create the certificate with keys and add them to the list of resources.
Right after creating the certificate you will have the only chance to save public and private key files. It is extremely important to do it. Private key is essential for the IoT button – this is how the button will identify itself and secure the connection to the cloud. Save all three files in a separate folder.
Record the AWS endpoint
Apart from the certificates, the IoT button needs a web-address associated with the AWS cloud. You can get this information by clicking on the icon of the newly created ‘iot-button’ thing. The properties tab contains the REST API endpoint. It typically looks like this: https://xxxxxxxxxxx.iot.us-east-1.amazonaws.com/things/iot-button/shadow Here, xxxxxxxxxxx is unique identifier of your IoT endpoint, us-east-1 stands for AWS service region. The rest – /things/iot-button/shadow specifies a particular devices. Record the xxxxxxxxxxx and the region (ex. us-east-1) – this information will be necessary for the IoT button set-up.
Upload certificates and WiFi set-up
We are finally ready to work with the IoT button itself. In order to enter the set-up mode, press and hold the button for 15 seconds, until the LED turns blinking blue. The device switches into Access Point mode and creates a WiFi network with with SSID Button ConfigureMe – xxx. The password is the last eight digits of the serial number located on the back of the button. Connect to the network and type http://192.168.0.1/index.html in your browser. This opens a simple web-form where we enter the previously collected information and attach key and certificate files.
Click Configure and the button will attempt to connect to the provided network, obtain IP and send the info to the IoT endpoint while flashing white LED light.
The certificate identifies the device to the IoT cloud back-end. However, it has not been given permission to actually publish any data. At this point, the LED will be flashing red, indicating unsuccessful publish process. Even though the WiFi connection works, we need to create appropriate rules
In the next post – Getting started with Amazon IoT button (Part II) – I will describe how to set up rules to process this information and send SMS and email click notifications.
Also, check out this post about storing and visualizing IoT button data.