Deal with sid reconfiguration

syncmonitor/environment.py

@@ -131,7 +131,7 @@ class Provider:
 
     def _update_cookie(self, new_cookie):
         logger.debug("Update from ourselves, cookie %s", new_cookie)
-        if self.sid is None:
+        if self.sid != new_cookie.sid:
             self.sid = new_cookie.sid
             self.sid_discovered(self.sid)
         self.cookie.update(new_cookie)