All Around Azure IoT. Join this free conference at January 19, 2021

TLDR: Missed the event? Here is the recording of my session:

At Janaury 19, 2021, Microsoft organizes a world-wide event about Azure IoT.

Add local storage to Azure IoT Edge modules using Docker Bind

Azure IoT Edge makes use of the Moby container runtime so IoT Edge modules (being Docker containers) can work together and offer logic on the edge.

Docker containers are ‘sandboxed’. This means that the logic within the containers has limited access to the environment they ‘live’ in.

By default, containers have no SUDO rights, no access to the host filesystem, and just limited network capabilities.

Though, containers can be granted elevated rights. One of these is the right to access the filesystem.

In this blog, we will see how to configure a container with access to the filesystem. To demonstrate this, a custom IoT Edge module is introduced, an IoT Edge filewatcher for CSV files:

Handling Advantech Wise 710 OPC-UA telemetry using OPCPublisher

Microsoft has an extensive IoT platform based on Azure.

It provides so many features, this can be overwhelming for customers. Therefore, Microsoft provides Azure IoT solution accelerators, based on the Azure IoT reference architecture.

Some of the original accelerators (it started with Azure IoT suites) like Remote Monitoring are now outdated or even archived. These are replaced by excellent Azure IoT Central apps which demonstrate the capabilities of the IoT platform for numerous markets and verticals:

There is still one original accelerator alive-and-kicking: the Connected Factory. This one demonstrates the use of OPC-UA protocols on the edge and in the cloud.

More than two years ago, I already wrote about this accelerator and the OPC publisher module, the backbone of this accelerator. Since then, a lot has changed. Some functionality is (temporarily) deprecated so I got a lot of questions based on the old blogs.

So it’s time to update it a little and see how the OPC Publisher is doing these days.

The OPC-UA solution is open source and covers a lot:

I limit this blog to the scope of my very first blog, extracting OPC-UA messages and send them to the cloud using a ‘published nodes’ file.

We just need an OPC-UA server to get some sample data from. For this, I used an Advantech Wise 710 as an industrial protocol gateway.

Azure IoT Edge module metrics in action

We are familiar with the Azure IoT Hub metrics which are offered. The Azure cloud tells us eg. how many messages are received or the number of devices that are connected.

If we look at Azure IoT Edge, you had to collect your own made metrics in the past.

Because IoT Edge modules are Docker containers and therefore sandboxed, you had to rely on the (third-party) logic to capture Host metrics. Regarding metrics about the edge agent and hub, these were not available.

Until now.

With the most recent IoT Edge runtimes, agent, and hub, we have access to Edge metrics.

Both the Agent and Hub module expose the metrics over HTTP endpoints:

Within the Moby runtime, port 9600 is exposed on both individual modules. Outside the runtime, we have to assign individual host ports to prevent using the same host port.

Let’s see how this looks like and how we can harvest metrics in a custom container.