Eclipse IoT Day is coming to the Bay Area – Submit a talk now!

Eclipse IoT Day is coming to the Bay Area on May 14, 2018, and I really hope you will be joining us!

We have opened a Call for Papers that will end on Feb 15th – so you have about 3 weeks to submit your talk!

If you are considering submitting a talk but are not sure whether it would be a good fit, here are some of the reasons why it would totally be 🙂

  • You are building an IoT solution that is based on open source software and Eclipse IoT components, and want to share some of the lessons learned along the way, the things you wished would be available as part of the open source IoT community
  • You are contributing to an Eclipse IoT project and want to provide an update on the overall roadmap,
  • You care about open standards, interoperability, security, edge computing, … and want to share your expertise and network with the attendees of the IoT Day.

Please don’t wait and submit your talk today!  For what it’s worth I will be more than happy to chat with you if you need feedback regarding your session idea.

Monetizing IoT Data using IOTA

There is a lot of buzz around cryptocurrencies  – will BTC be over $20,000 by the time this blog post goes live? 🙂 – these days, but beyond the hype, one thing is pretty clear: it enables a decentralized economy that is particularly interesting to look at from an IoT perspective.

For the Internet of Things, I believe the role of cryptocurrencies and distributed ledgers is threefold:

  • monetization of IoT data – cryptocurrencies make it really easy to implement scenarios where data producers can get a financial compensation in exchange for the value provided by the data they expose. Think of a weather station you would put on your balcony: people or corporations could have access to the feed of sensor data in exchange for some tokens.
  • smart contracts – taking monetization a step further, smart contracts can enable higher-order, secured, transactions to automatically take place on the network. If you take the example of the weather station, you could sign a smart contract with a 3rd party whereby you get paid for giving access to your sensor data if and only if you can provide an uptime of at least 99%. Note that this would probably require a trusted third party responsible for checking your uptime and storing it in the ledger.
  • security – manufacturers can use a distributed ledger to store information that can be used to help securely bootstrap  IoT devices, by e.g allowing customers to check the authenticity of a chip.

In this blog post, we will focus on the first topic: monetizing IoT data.

For that, we will look at leveraging IOTA’s distributed ledger. We will be showing how anyone can be given access to “simple” IoT sensor data on an MQTT broker, while only people who are paying for it will be able to access the live, raw, data stream.

Use case

We will be basing this article on the use case of someone, let’s call her Jane, willing to give access to a live sensor data stream coming from a smart plug, granted that she gets some money (iotas) in return 🙂 .

The instant power consumption metrics will be published to an MQTT broker twice per second, making for a pretty accurate sampling that people might be interested in buying. On the same MQTT broker, Jane will also be making available the 1-min moving average of the power consumption for anyone to access, even if they don’t necessarily want to pay extra money.

When John, who is maybe a data scientist interested in getting his hands on “real” data wants to get the power consumption from Jane’s smart plug, he has two options:

  • access the MQTT broker and subscribe to data published on the ‘public’ sensor/1m topic, for free,
  • send some IOTAs to Jane (she’s decided that 500 iotas is what people should pay to access the data for one hour), for his MQTT client to be granted access to sensor/live topic where the live, and more valuable to him, data stream is being published.

Technology being used

  • Eclipse Mosquitto as our MQTT broker of choice.
  • Two IOTA wallets, one where the payments to Jane shall be sent to, and one for John to pay for accessing sensor data
  • mosquitto-auth-plug, a flexible authentication plug-in for Mosquitto. We will use it for implementing a flexible access-control model, based on the information available on the IOTA tangle (i.e payments)
    • The ACLs (access-control lists) will be stored in a MongoDB database, used as the authentication backend for mosquitto-auth-plug
  • A Belkin WeMo Insight smart plug.


Enough with the words! I’ve put together a video (click here if the video doesn’t show up below) that shows the whole scenario in action. While you will quickly realize that I do a bad job impersonating Jane and John, what I hope you notice is that this is a real demo, and anyone can implement something similar today.

The technology is here, and while it has some limitations, I do think it’s worth exploring what new scenarios it enables.

Check out the code

I have published all the code behind this proof-of-concept on my Github repository, please check it out and open pull requests or issues if you happen to give it a try!

Next steps?

This is obviously a simple proof-of-concept, and I am almost certain it is not free of security issues. I would certainly be happy to hear from you if you have feedback :smile:.

I see at least two things that would be worth improving:

  • IOTA transactions, just like with many other distributed ledgers, can take a significant amount of time before they get confirmed. Having to wait for a couple hours after you’ve made a payment to effectively get access to the data can seriously impact the user experience. A nice improvement would be to rely on IOTA Flash Channels,  as they allow to perform instantaneous, off-tangle transactions.
  • In the current PoC, the Mosquitto server only accepts connections from a list of users already agreed upon. This wouldn’t be difficult, and much smarter, to allow anonymous access to anyone, and let clients interested in having full access to the data indicate in their payment message the username/password they plan on using when reconnecting as authenticated clients. This information should, of course, be encrypted with a key only known to the client and the server – this key, unique for each client, could be broadcasted to anonymous clients on the $SYS topic, for example…

Do you see other areas for improvement? Have you seen similar solutions implemented with other cryptocurrencies?

Note that the IOTA folks have recently announced an IoT data market that seems to implement a similar idea, but I haven’t had time to look into it closely.

Cloud Native IoT Development in Practice

With Kubecon happening this week in Austin,  it is probably a good time to write an article on the role of containers and having a cloud native strategy for IoT, don’t you think?

Over the past years, Docker and its ecosystem have been instrumental in modernizing our approach to writing and shipping software. Today, more and more applications are becoming cloud native, meaning that not only core functionalities are being isolated as (micro)services, but also that applications are evolving to be first-class citizens in cloud environments (e.g exposing health metrics, acting as stateless processes, etc.).

In this blog post, we will be looking at how to approach cloud native IoT development. We will be deploying an end-to-end IoT solution for power consumption monitoring on OpenShift. The deployed services include:

  • IoT connectivity layer – getting telemetry data into a backend system is a challenge in itself, and we’ll see how Eclipse Hono can help with IoT connectivity ;
  • Device data simulator – as a way to illustrate how thinking cloud native for IoT can help make your application scale, we will actually have device simulators running on our cluster ;
  • Monitoring dashboards – we’ll see how we can leverage Grafana to visualize the data coming into our cluster, and its overall health ;
  • End-user application – getting IoT data into our backend is one thing, but we’ll also see how to develop a simple web application to visualize our instant power consumption ;
  • Cloud IDE – we will be using Eclipse Che to develop the web application mentioned just before.

So, let’s break this down!

Firing up a single-node OpenShift cluster with Minishift

The best way to get an OpenShift cluster setup is to use Minishift, which helps you deploy a single-node cluster on your local machine.

You can download the latest Minishift releases, and find install instructions on the project’s Github repository.

Once you have the Minishift command installed, firing up the cluster is actually pretty easy. Here’s the command I use on my quad-core Intel i7 MacBook Pro:

minishift start --cpus 4 --memory 12GB --metrics --disk-size 40GB

Obviously, your mileage will vary depending on the number of CPUs, memory, or disk space you want to allocate to your cluster, but no matter what your operating system is, soon enough you should be able to log into the OpenShift web console.

Scalable IoT Messaging with Eclipse Hono

Eclipse Hono enables scalable and secure ingestion of large volumes of sensor data into backend systems.

Eclipse Hono Overview
Eclipse Hono Overview

The different building blocks of Hono (protocol adapters, device registry, …) can be deployed as microservices.

Deploying Hono on OpenShift is really easy: just follow the instructions available in the documentation! In my setup I’ve deployed a Hono environment where the core messaging functionality is taken care of by EnMasse, but you should also be fine with the regular, Qpid Dispatch-based, distro.

Feeding data into our system

Now that our IoT connectivity layer is deployed, with Hono running within our cluster, we want to ingest data into our system, and consume this data to e.g store it in a database.

Jens Reimann put together a nice setup that uses a public dataset of the energy consumption of a residential house to simulate “real” IoT devices. The application essentially deploys two services on our cluster:

  • A data simulator that sends energy consumption information to Hono using MQTT. The producer can be configured to simulate 1, 10… 10,000 of devices. And of course, you can also scale up the number of pods for the simulator to simulate even more devices.
  • A data consumer that taps into Hono’s telemetry API to retrieve data coming from all our virtual houses, and dump it into an InfluxDB time-series database.

If you follow the install instructions provided in Jens’ repo, you should have your simulator and consumer running in your OpenShift cluster, and data will start showing up in your InfluxDB database.

Here’s an example of how my Grafana dashboard looks like:

Running Eclipse Che on OpenShift

So we now have an IoT messaging infrastructure deployed in our OpenShift cluster, as well as an IoT app effectively pumping business data into our backend. Wouldn’t it be cool if we could also have the developer tools needed to write our user-facing application running in the same cluster?

Eclipse Che is a developer workspace server and cloud IDE that we will be deploying in our cluster, and using to write some Javascript code right from our browser. Deploying Eclipse Che on OpenShift is pretty straightforward and you can refer to the instructions on the Eclipse Che website to deploy it into your OpenShift project.

In my case, here’s how I would get the nightly build of Che 5.x deployed into my OpenShift project:

export CHE_IMAGE_TAG="nightly-centos"
export CHE_MULTIUSER="false"
export CHE_OPENSHIFT_PROJECT="hono"    


curl -fsSL ${DEPLOY_SCRIPT_URL} -o ./
curl -fsSL ${WAIT_SCRIPT_URL} -o ./
curl -fsSL ${STACKS_SCRIPT_URL} -o ./

bash ./ ; bash ./ ; bash ./

And that’s it! Depending on your Internet speed it may take a few minutes for everything to get deployed, but Eclipse Che now just is a click away, accessible through a URL such as

Writing our user-facing ExpressJS app from Eclipse Che

However quick this all was to set up, we’ve essentially worked on the infrastructure of IoT application: messaging, development environment, …

Arguably, the most interesting part is to actually make use of the data we’ve been collecting! For this, we will be developing a Node.js application that will be getting the overall electricity consumption metrics from  InfluxDB and displaying them on a fancy gauge.

The final version of the app is available here on my Github account. It uses Express, the InfluxDB client for Node.js, as well as gaugeJS for the gauge widget.

There are at least two interesting things to note here:

  • Thanks to Eclipse Che, we can not only easily set up a stack for Node.js development in no time, but we really have a full-blown IDE that includes advanced content assist features – not something you get that often when developing Javascript code. I can tell you that not being an expert in using the InfluxDB Javascript API, having code completion available in the IDE has been a pretty useful thing 🙂

  • Since Eclipse Che runs on the very same OpenShift cluster that holds our IoT backend, we can easily test our code against it. From within our Che workspace, all our environment variables are set up, and we can e.g access Hono, InfluxDB, etc.

Closing the loop

One last thing… We now have a Node.js application built from Che, that lives in its own Github repo. Wouldn’t it be great to have it run in our cluster, alongside the rest of our microservices?

From the OpenShift console, you are just a couple clicks away from deploying the Node.js app into the cluster. You can use the template for Node.JS applications to automatically build a Docker image from the Github repository that contains our app. It will automatically detect that the repository contains a Node application, install all its dependencies, build an image, and then deploy it to a pod with a route properly configured to expose our app outside of the cluster.

You could also set up a hook so that whenever there is a new commit in the upstream repository, the image gets rebuilt and redeployed.


Hopefully, this blog post helped you understand the importance of thinking cloud native when it comes to IoT development.

If you use Eclipse Hono for your IoT connectivity layer, for example, you automagically get a piece of infrastructure that is already instrumented to autoscale, should the number of devices connected to your backend require it.

Thanks to Eclipse Che, you can develop your IoT services in a controlled environment, that is already part of the same cluster where the rest of your IoT infrastructure and applications is already running.

Final words: don’t push it!

Now, I cannot conclude this blog post without a personal observation, and something I hope others have in mind as well.

Many moons ago, I used to teach people how to develop plugins for the Eclipse RCP platform – a truly great, highly extensible, framework. However, the platform being so modular, soon enough, you could end up turning everything into a plugin, just for the sake of having an “elegant” design. And when you think about it, microservices are very similar to Eclipse plugins…

Does it really make sense to isolate really tiny microservices in their own containers? For each microservice, what’s the overhead gonna be like to be maintaining its build system, access rights to the corresponding Git repository, configuration files, …?

You should absolutely have a cloud native strategy when it comes to building your IoT solution, but don’t overthink it! Your microservice architecture will likely emerge over time, and starting with a too small service granularity will just make things unnecessarily complex.

Please use the comments section below to share your thoughts on cloud native and IoT. I think this will be a hot topic for the near future, and I’m interested in hearing your views!

Final note: Shout out to Jens Reimann and Dejan Bosanac from Red Hat who’ve put a lot of work into the Hono part of the demo (running Hono on OpenShift, and putting together the demo app publishing electricity consumption information). Thanks also to Eugene Ivantsov for helping out with getting a proper Eclipse Che stack for JavaScript set up.

Eclipse, open-source for the Internet of Things, and other random stuff