Background
I have a pull request (#17767) for HA that adds improved Fire TV support. It works by establishing an ADB connecting to the Fire TV using the python-adb library and polling the device.
The problem
The python-adb library has a limitation that if you issue too many ADB commands in short succession, it will “overload” the ADB connection and break it.
Current solution
In the HA component, for each device I have an attribute called _adb_lock, and I created a wrapper function for all ADB methods that I called adb_wrapper. The basic idea is to wait up to 5 seconds until _adb_lock is False and then issue the ADB command. Here is the code:
def adb_wrapper(func):
"""Wait if previous ADB commands haven't finished."""
@functools.wraps(func)
def _adb_wrapper(self, *args, **kwargs):
attempts = 0
while self._adb_lock and attempts < 5:
attempts += 1
time.sleep(1)
if attempts == 5 and self._adb_lock:
try:
self._firetv.connect()
except self._exceptions:
_LOGGER.error('Failed to re-establish the ADB connection; '
'will re-attempt in the next update.')
self._firetv._adb = None
self._adb_lock = False
return
self._adb_lock = True
try:
returns = func(self, *args, **kwargs)
except self._exceptions:
returns = None
_LOGGER.error('Failed to execute an ADB command; will attempt to '
're-establish the ADB connection in the next update')
self._firetv._adb = None
finally:
self._adb_lock = False
return returns
return _adb_wrapper
Help wanted!!!
In order to get my pull request merged, I can’t use time.sleep. One option is to use asyncio for sleeping. However, given that the sleep function was a workaround in the first place, there might be a better way of using async to avoid running an ADB command before the previous one has finished. I haven’t used async before, so I don’t know it’s capabilities or how to use it. Help would be very much appreciated! Especially in the form of pull requests (either of the following repos will work)! 
My Home Assistant pull request branch: https://github.com/JeffLIrion/home-assistant/tree/dev-firetv-adb
My native Fire TV support repo: https://github.com/JeffLIrion/homeassistant_native_firetv