Log out of router admin interface after devices are recorded.

homeassistant/components/device_tracker/tplink.py

@@ -162,6 +162,7 @@ class Tplink3DeviceScanner(TplinkDeviceScanner):
     def scan_devices(self):
         """Scan for new devices and return a list with found device IDs."""
         self._update_info()
+        self._log_out()
         return self.last_results.keys()
 
     # pylint: disable=no-self-use
@@ -251,6 +252,21 @@ class Tplink3DeviceScanner(TplinkDeviceScanner):
 
             return False
 
+    def _log_out(self):
+        with self.lock:
+            _LOGGER.info("Logging out of router admin interface...")
+
+            url = ('http://{}/cgi-bin/luci/;stok={}/admin/system?'
+                   'form=logout').format(self.host, self.stok)
+            referer = 'http://{}/webpages/index.html'.format(self.host)
+
+            response = requests.post(url,
+                                     params={'operation': 'write'},
+                                     headers={'referer': referer},
+                                     cookies={'sysauth': self.sysauth})
+            self.stok = ''
+            self.sysauth = ''
+
 
 class Tplink4DeviceScanner(TplinkDeviceScanner):
     """This class queries an Archer C7 router with TP-Link firmware 150427."""