Values_0.LocationTimestampSourceDescribes how to interpret an application-defined timestamp value from an MQTT message payload and the precision of that value.
type nonrec t = {value : String_.t;An expression that returns a long epoch time value.
*)unit : String_.t option;The precision of the timestamp value that results from the expression described in value. Valid values: SECONDS | MILLISECONDS | MICROSECONDS | NANOSECONDS. The default is MILLISECONDS.
*)}