I would store some data on the dongle, not only get data from it. Is it possible ?
The device already bufferes all data in a Redis DB, before uploading it to the cloud. As of now there isn’t anything available to keep it locally. But you can make it on your own. You need to hook into this file:
Alternatively you can make a new Cloud module under the Custom Modules section and add it to your device. You can get inspiration from the existing cloud uploader.