I have tried that but not working pebble still disconnects from phone.
When i reboot the phone all is working correct, Pebble remain connected and I receive all notification.
I have noticed that it get disconnected when I use other apps facebook, chrome or even when enter settings on phone.
Then when I open pebble app on android it reconnects but notifications are not showing on pebble, but still i receive incoming calls.
I think the Pebble service is simply killed in background, even when is whitelisted in task killer and ignore optimization.
Good that is working in your case but i will still look for solution for my case.