MQTT LWT not sent after subsequent disconnects on same session

Issue

• Will message is not established again, if the client reconnects.
• MQTT v3.1.1 Section 3.1.2.5 implies that the Will details provided in the CONNECT packet should be associated with the newly established network connection, regardless of whether a session is being resumed.
• The client should be able to update its Will message on reconnection without needing to start a new session.