Use question regarding sleeping devices

[GregSawin]

I've recently added power saving sleep calls to my devices and one issue I have is that messages are held up until after it wakes up. I was thinking I could loop for a few seconds and check some status to see if any messages were still waiting to be sent. I don't see any public methods or fields that would allow for this though. Am I overlooking something or perhaps there's a better way to do this?
Ideally a way to burst out any remaining messages as the device is going to sleep so it doesn't matter if it takes 4sec to recover. I wouldn't want to wait too long, ie if not connected, and would likely clear any events that didn't publish before sleeping.