Sends a notification to all clients observing a given resource.
def send_notification(uri: str) -> None: ...
This method sends a notification to all clients observing the resource identified by URI, notifying them of its latest state. Clients should be notified whenever a resource's content changes (or periodically, if it changes very often) by sending a 2.xx response code; typically 2.03 "Valid" or 2.05 "Content". Clients should also be notified if a resource can no longer be observed (e.g., when it is deleted) by sending a notification with a non-2.xx response code (e.g., 4.04 "Not Found"). The class will automatically unregister all observers when a non-2.xx notification is sent.
The response_data property specifies the data that will be sent in the response, and the response_code property specifies the response code. If the response_content_format and/or response_e_tag properties are non-empty, their values will be used to include Content-Format and Etag options in the response (respectively). Any additional options present in the ResponseOption* properties will be included as well.
If the use_confirmable_messages property is enabled when this method is called, the class will automatically retransmit the response message (if necessary) until it receives confirmation from the client that it was received. Note that the retransmission period is not infinite; eventually the class will assume that the message is undeliverable and time out the response.
Note: This method can only be called when the class is operating in server mode (i.e., when the listening property is enabled).