In short, yes itβs possible to modify and upload a firmware that is specific for your needs. In order to upload the firmware, we offer a RuuviTag Development Kit.
You will find information about tools at RuuviTag Firmware GitHub repository and resources and examples in our Blog. Check this forum also for topics for related questions and we will of course help with any questions you might have.
The Ruuvi tag development kit is a thoughtful product for users like me who want to customize firmware. I have a small suggestion: please add the shield as a standalone purchasing option. I can get the development kit locally, but I only need the shield for custom programming. Currently, I donβt have this option, as the shield only comes bundled with the development kit.