baeke.info

Adaptable IoT

Advertisements

On May 24, 2017 I gave a short partner session at Techorama, a technology event in Belgium for both developers and IT Pros. You can find the slides on SlideShare:

Since it was a short session and a short slide deck, this post provides a bit more background information.

First, what do I mean with Adaptable IoT? Basically, an IoT solution should be adaptable at two levels:

  1. The IoT platform: use a platform that can be easily adapted to new conditions such as changed business needs or higher scaling requirements; a platform that allows you to plug in new services
  2. The application you write on the platform: use a flexible architecture that can easily be changed according to changing business needs; and no, that does not mean you have to use microservices

The presentation mainly focuses on the first point, which deals with the platform aspects that should be adaptable end-to-end at the following levels:

Before continuing, note that this post focuses on Microsoft Azure with its Azure IoT Suite. The concepts laid out in this post can apply to other platforms as well!

Devices and Edge

There is a lot to say about devices and edge. What we see in the field is that most tend to think that the devices are the easy part. In fact, devices tend to be the most difficult part in an end-to-end IoT solution. Prototyping is easy because you can skip many of the hard parts you encounter in production:

When you move to production and you want to create truly adaptable devices, you will need to think about several things:

Take into account that many devices will not be able to connect to your back-end directly, requiring a gateway at the edge. The edge should be adaptable as well, with options to do edge processing beyond merely relaying messages. What are some of those additional edge features?

Ideally, the edge components are developed and tested in the cloud and then exported to the edge. Azure IoT Edge provides that functionality and uses containers to encapsulate the functionality described above.

Ingestion and management

The central service in the Azure IoT Suite for ingestion and management is Azure IoT Hub. It is highly scalable and makes your IoT solution adaptable by providing configuration and reporting mechanisms for devices. The figure below illustrates what is possible:

Device Twin functionality provides you with several options to make the solution adaptable and highly configurable:

In a previous post, I already talked about setting desired properties with Device Twins and that today, you need to use the MQTT protocol to make this work. You can use the MQTT protocol directly or as part of one of the Azure Device SDKs where the protocol can simply be set as configuration.

The concept of jobs makes the solution even more adaptable since desired properties can be set on a group of devices using a query. By creating a query like ‘all devices where tag.building=buildingX’, you can set a desired property like the reporting interval on hundreds of devices at once.

Processing

The selected cloud platform should allow you to create an adaptable processing pipeline. With IoT Hub, the telemetry is made available to downstream components with a multi-consumer queue. An example is shown below:

It is relatively easy to plug in new downstream components or modiy components. As an example, Microsoft recently made Time Series Insights available that uses an IoT Hub or an Event Hub as input. In a recent blogpost, I already described that service. Even if you already have an existing pipeline, it is simple to plug in Time Series Insights and to start using it to analyze your data.

Advertisements

Advertisements