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navUserIDReceive returns the user ID and timestamp.
Note that the user ID is only valid after a "User ID" event is raised; the event will be removed when this function block is called.
A "User ID" event is raised when the user ID is changed in the navigation device or is requested with navUserIDRequest.
navUserIDReceive automatically authenticates a user ID when this is required.
time : DINT
The timestamp when the specified user ID took effect.
user : STRING
The user ID.
If no user ID has been set, the string will be empty.
ready : BOOL