Comparing Open-Source OTA Update Engines for Embedded Linux
If you are building an embedded Linux product, one of the engineering decisions you face is which on-device update engine to use. This decision has lasting implications: embedded devices routinely have lifecycles of 5 to 15 years, and whichever update mechanism you choose today will determine how you ship software to devices already in the field for the entire duration of that lifecycle.
Fortunately, the landscape of open-source OTA update engines for embedded Linux has matured significantly over the past decade. Where teams once wrote bespoke shell scripts to flash partitions, there are now several ready-made open-source tools available to choose from. These tools differ in philosophy, architecture, features, and the trade-offs they make. In this article, we survey and compare the major open-source OTA update engines for embedded Linux, examine the fundamental techniques and strategies they employ, and provide a technically grounded comparison.