So what does your boss do when the device has no internet connection and you show a message or alarm him
What I do
- send an FCM message from my server
- if the device has received the message, use a httpjob to commit the reception
- if there's no commit for x time, send messages to defined devices (e.g. yours) to be alarmed that your boss is "out of reach"
Optionally:
- move your bosses device (and your boss perhaps) back to an area where there's reception