Send to only one device

[tizianatinnirello]

Ho can i send notification to single device and get delivery confirm?

[K0IN]

Messaging a single device is not possible, although you can open a PR and add this functionality.
A delivery confirmation is not possible since the service is fire and forget, we push notifications to your browser vendor messaging server, what happens after that is not on our side.

There is also another issue, that the messaging server might only keep the last x messages (or is size limited, like 4 mb/browser).

We can implement a (workaround) poll based system where we store the messages in the backend and devices can look up missed messages, but this is not implemented.