Added "addMessage" method

src/SimpleSseSever.py

@@ -55,10 +55,31 @@ class SseStream():
         """ Method which is called regular to send out the event """
         while True:
             msg = self.queue.get(block=True, timeout=None)
-            if isinstance( msg, sse ):
+            if isinstance( msg, sse.Sse ):
                 for data in msg:
                     yield data
 
+    def addMessage(self, event_name, data, id = 0):
+        """ 
+        Adds a event to the queue so it can be sent out
+        ---
+        Parameters:
+        ------
+        event_name: str
+            Name of the event
+        data: string or list of strings
+            Datat to be send
+        id: int
+            id of the event, if set to 0 no ID will be sent """
+        event = sse.Sse()
+        if id > 0:
+            event.set_event_id(id)
+        else:
+            event.reset_event_id()
+        event.add_message( event_name, data )
+
+        self._queue.put(event)
+