Hi,
We are exploring ideas of DWEB to send updates from mobile to mobile in couple of Opensource projects. For instance Mapeo (mapeo.app) can boardcast a new update of the app on the local network for local offline updates.
Few years ago, I had created a PWA (Progress Web App) that uses local storage in the browser to store and display content that could be read offline. The challenge then was the local discovery protocols were in early stages, but today you can use React like framework to download and display content on the device.
Would love to learn more about your use case. Feel free to reach out to me via DM.
Cheers
Arky