Last Will and Testament triggering on Client Take-Over
Question
When is the LWT (Last Will and Testament) being triggered on Client Take-Over?
When the LWT is not being triggered on Client Take-Over?
Answer
Will Message is sent when... | Will Message is not sent when... |
|---|---|
An I/O error or network failure detected by the Server. | The Network Connection is closed normally by the Client sending a DISCONNECT packet with Reason Code 0x00. |
The Client fails to communicate within the Keep Alive time. | The Will Flag is set to 0. |
The Client closes the Network Connection without first sending a DISCONNECT packet with Reason Code 0x00 (Normal disconnection). | A new Network Connection for the ClientID is opened before the Will Delay Interval has elapsed. |
The Server closes the Network Connection without first receiving a DISCONNECT packet with a Reason Code 0x00 (Normal disconnection). | The Server has deleted the Will Message on receipt of a DISCONNECT packet with Reason Code 0x00 (Normal disconnection) or before the Will Delay Interval has elapsed. |
The Will Delay Interval has elapsed and the Session ends. | The Server experiences failure or shutdown and defers publication of Will Messages. |
A new Network Connection to this Session is made before the Will Delay Interval has passed. | The Will Delay Interval is absent or set to 0. |
A Client Identifier of an existing Network Connection to the Server is used, and Clean Start is set to 1. | Clean Start is set to 0 and the Will Delay Interval is greater than 0. |