[tests] Waiting before call to deepsleep to allow buffers to flush #3017
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Description
Since deepsleep() may shut down the UART peripheral, I added a wait for 10ms to allow for hardware serial buffers to completely flush.
This should be replaced with a better function that checks if the hardware buffers are empty. However, such an API does not exist now, so I'm using the wait_ms() function for now.
Should resolve some of the issues discussed here: #2966
Status
READY
Migrations
If this PR changes any APIs or behaviors, give a short description of what API users should do when this PR is merged.
NO
Todos
FYI @sg- and @mmahadevan108