Set the passcode for the shared "system" connection used to send messages to
the STOMP broker from within the application, i.e. messages not associated
with a specific client session (e.g. REST/HTTP request handling method).
<p>By default this is set to "guest".
Set the passcode for the shared "system" connection used to send messages to the STOMP broker from within the application, i.e. messages not associated with a specific client session (e.g. REST/HTTP request handling method). <p>By default this is set to "guest".