Fix the delay issue w/ asyncio.

git-svn-id: https://redmine.imt-atlantique.fr/svn/xaal/code/Python/branches/0.7@2709 b32b6428-25c9-4566-ad07-03861ab6144f

devices/emulations/Fauxmo/xaal/fauxmo/binding.py

@@ -3,6 +3,13 @@ from fauxmo.plugins import FauxmoPlugin
 from xaal.monitor import Monitor
 
 
+import time
+import asyncio
+
+import nest_asyncio
+nest_asyncio.apply()
+
+
 logger = logging.getLogger()
 
 monitor = None
@@ -65,9 +72,30 @@ class XAALPlugin(FauxmoPlugin):
                 send(dev.address,tmp[1])
         return True
 
+
     def get_state(self):
+        # Alexa send a bunch (3) + (2) get_state request without any delay
+        # Due to async use in Fauxmo, we need to async.sleep() to receive 
+        # device update throught the monitor.. 
+        # but the get_state is not async :( .. so no await or waitfor.. 
+        # Only ensure_future() and run_until .. 
+        # Last important notice : Python 3.9 avoid the run_until_complete
+        # while loop is already running. nest-asyncio come to rescue !
+        loop = asyncio.get_event_loop()
+        loop.run_until_complete(self._get_state())
+        return self.value
+
+    async def _get_state(self):
+        # we wait for 0.2 sec if the value isn't what we expected
+        # this let's the device (and monitor) to push new value for 
+        # the next call
+        self.value = self.__get_state()
+        if self.value != self._latest_action:
+            logger.warning(f'state={self.value} != latest_action={self._latest_action}')
+            await asyncio.sleep(0.2)
+
+    def __get_state(self):
         "loops throught devices to find a least one w/ the right state"
-
         for dev in self.get_devices():
             tmp = self.get_mapping(dev)
             if tmp == None: continue
@@ -81,7 +109,7 @@ class XAALPlugin(FauxmoPlugin):
                 return self._latest_action
 
         # no device found with the right state, so send 
-        # the current state instead. sending "unknown"
+        # the wrong state instead. sending "unknown"
         # should be better, but it raise a big warning
         if self._latest_action == 'on':
             return 'off'