It's FOSS - https://itsfoss.com/mender-embedded-linux-ota/
Brief: Mender is an open source tool for updating your embedded devices safely and reliably, over the air. This helps to solve the problem of updating embedded and connected devices.
Internet of Things and connected devices are everywhere. And though they solve a number of specific problems, these Internet of Things devices can easily be converted into the Internet of Threats if they are not patched for security vulnerabilities.
If you manage connected devices, you should already be aware of the challenges it throws in terms of updates. If you have a fleet of such devices, it will become a