We are starting to develop a Web App that can work in different devices and still be connected between them even if there is no internet connection, but a working local network.
We need to send notifications between devices in the same local network with no internet, and we would really like to develop a PWA, if not possible work with native mobile apps.
If anybody knows how to make Service Workers work this way, we would appreciate it.
UPDATE: We found this information: https://developer.chrome.com/apps/app_network
We think that maybe using UDP we can manage to make it work, but we are not sure...