“IoT platform open source” is what people type when they want a device-to-cloud system whose source code is public, so they can inspect it, change it and, if they choose, run it themselves. For ESP32 and ESP8266 makers this matters mostly for one reason: a closed service can change its limits or prices after your project depends on it. This guide explains what the term covers, lists options taken from each project’s own pages, and is clear about what open source does not fix.
IoT Platform Open Source: What It Means
Most IoT platforms bundle three things: a way for devices to publish data (usually MQTT or HTTP), a backend that stores and routes it, and a dashboard that shows it. Wikipedia’s overview of the Internet of Things describes this layered idea. An open-source platform publishes the code for some or all of those layers under a licence that lets you read and modify it.
Two questions are easy to mix up. One is whether the code is open. The other is who runs the server. A project can be open source and still be offered as a paid hosted service, and a hosted service can be free without being open source. Check both before you build on anything.
Recent Signs the Category Is Growing
On 5 August 2026 Espressif announced ESP RainMaker Neo, an open-source device-to-cloud-to-phone platform under the Apache 2.0 licence. Espressif says the cloud backend, firmware SDK, phone app SDK and reference app are open, and that it is designed to be deployed in your own AWS account. The earlier product continues as ESP RainMaker Classic.
On 19 February 2026 SUSE announced its acquisition of Losant, an industrial IoT platform. In the same announcement SUSE said it plans to open source the Losant technology. That is a plan, not a finished release, so I would not build on it yet.
These two announcements show vendors moving towards open code. They do not tell you whether a particular platform suits your project.
IoT Platform Open Source Options Worth a Look
This list comes from each project’s own pages. It is not a test of mine, so try one on a small project before you commit.
- ThingsBoard. Its GitHub page describes an open-source IoT platform under the Apache 2.0 licence, for device management, data collection and dashboards. You can install it yourself or use its hosted cloud.
- ESP RainMaker Neo. Built for Espressif chips and deployed in your own AWS account, so the hosting sits with you.
- Mosquitto. An open-source MQTT broker. It moves messages between devices and other software but has no dashboard of its own.
- Home Assistant. Open-source home automation software that can show and act on data from devices you connect.
- Grafana. Open-source charts and dashboards. It needs a data source behind it and does not manage devices.
What Open Source Does Not Fix
If you self-host, you run the server, the updates, the backups and the security. Some of these projects also offer a hosted version, and that version has plans and limits of its own. Choosing an IoT platform open source project gives you the option to move. It does not remove the work of running the system.
Limits matter on hosted services of every kind. My borewell pump controller reports sixteen fields about every five seconds, and it ran out of Blynk’s free message allowance within days. As I saw Blynk’s pricing page on 30 September 2026, the Free plan lists 100,000 messages. If every field were sent as its own message, sixteen fields every five seconds would be 192 messages a minute, or 276,480 a day. Work out your own message volume before you pick any platform, open source or not.
Where Nodik Fits
Disclosure: I build Nodik. It is a hosted ESP32 dashboard, not a self-hosted open-source project, so it belongs with the free hosted options and not in the list above. Its free plan covers four devices. I moved the pump controller there after the Blynk allowance kept running out. Nodik limits how often a device can update, depending on the plan, so check the interval for the plan you would use before assuming five-second updates.
If you are comparing the two, the post on Blynk vs Nodik sets them side by side, and how to migrate from Blynk to a free IoT platform covers the move itself.
Getting Started With an IoT Platform Open Source Project
- Flash a basic Wi-Fi test sketch to your ESP32 or ESP8266 to confirm it connects.
- Choose your stack: a broker such as Mosquitto plus a dashboard, or an all-in-one platform.
- Wire and code one sensor first, not all of them at once.
- Set a publish interval that your platform’s limits allow, and batch values into one message where you can.
- Add the remaining sensors one at a time, checking the dashboard after each.
If you need project ideas to test a platform with, see ESP32 project ideas for final year students. For battery-powered nodes, deep sleep between readings cuts both power use and the number of messages you send.
IoT Platform Open Source FAQ
Is an open-source platform harder to set up than a hosted one?
It depends on how you run it. A hosted option is usually quicker to start. Self-hosting means you handle installation, updates and security.
Do I have to self-host an open-source platform?
No. Some projects, ThingsBoard among them, also offer a hosted cloud. The benefit of open code is the option to leave, not an obligation to run the server.
Is Nodik open source?
No. Nodik is a hosted dashboard I build, with a free plan for four devices. It is included here because it is one way to avoid message-count limits, not because it is open source.
About Nodik
Nodik is a hosted dashboard for ESP32 projects, built by the author of this site. The free plan covers four devices.
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