Updated/rewrote toolkit listener implementation.

Author: chsou

CHANGELOG.md

@@ -1,5 +1,11 @@
 # Changelog
 
+ * Updated and rewrote Notification 2.0 listener implementation. Added additional parameters for more control: 
+   `consumer_name`, `shared`, `auto_ack` and `auto_unsubscribe`. Added `unsubscribe` function for removing
+   subscribers on demand. Both `AsyncListener` and `Listener` now provide consistent `start`/`stop` functions
+   which take care of coroutine and thread creation. The `listen ` function can still be invoked directly if
+   necessary. 
+
 ## Version 3.3.0
 
 * Added `get_by` function to inventory API to return a single object by query.

c8y_api/model/notification2.py

@@ -280,7 +280,7 @@ def __init__(self, c8y: CumulocityRestApi):
         super().__init__(c8y, '/notification2')
         self.host = urllib.parse.urlparse(c8y.base_url).netloc
 
-    def generate(self, subscription: str, expires: int = 60, subscriber: str = None,
+    def generate(self, subscription: str, expires: int = 1440, subscriber: str = None,
                  signed: bool = None, shared: bool = None, non_persistent: bool = None) -> str:
         """Generate a new access token.
 
@@ -303,9 +303,10 @@ def renew(self, token: str) -> str:
         """Renew a token.
 
         Args:
-            token:  Currently valid token to be renewed.
+            token:  Token to be renewed.
         """
 
+
     def unsubscribe(self, token: str):
         """Invalidate a token and unsubscribe a subscriber.