Again, I can only talk about Boomerang sources . Boomerang lowpower works upon the principle of synchronised global time known to all motes in the network. All synchronised motes then go to sleep and wake up at the same time (duty cycle). All messages are sent/received within this duty cycle. Messages queued to sending outside this time are simply buffered until the next duty cycle. In Boomerang this is managed by 2 components, netSync which handles global time and netWake which handles the wake/sleep mechanism.
If you have access to a Boomerang environment, run the Trawler application compiled for lowpower. There you can see that messages may arrive at an inconsistent rate, but they all arrive eventually.
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