When the Burst Timer countdown reaches zero, the device should burst (publish) the latest available data. The buffer of measurements to burst is refreshed at the update period of the Device Variable.
For instance, if PV updates every 1 second, then the Burst buffer is refreshed every second. When the Burst Timer expires(it is time to burst) the latest PV is send via Burst. If the Burst update is slower than the PV update period then there will be intermediate values that are not seen.
Burst must not be delayed while waiting for measurements. The latest data available should be sent in the burst message.
Always burst the latest data possible for all Device Variables.