https://inorderly.com/tags/telemetry/ Recent content in Telemetry on Inorderly.com Hugo en-us Sun, 18 Oct 2026 00:00:00 +0000 https://inorderly.com/ordering-sensor-telemetry-from-devices-with-bad-clocks-and-late-uploads/ Sun, 18 Oct 2026 00:00:00 +0000 https://inorderly.com/ordering-sensor-telemetry-from-devices-with-bad-clocks-and-late-uploads/ <p>Sensors are the worst-behaved producers there are. Their clocks drift. Some sit behind a gateway that forwards readings in batches. Some lose their connection for a while, keep what they measured, and send it all at once when they&rsquo;re back. A few readings just never arrive.</p> <p>This worked example has 200 devices sending a temperature reading every 10 seconds for three hours, 216,000 readings in all. Their clocks are up to 3 seconds out. Fifty of them sit behind five gateways that forward every 45 to 90 seconds. Twenty go offline for 2 to 12 minutes and ten for 25 to 40 minutes. 634 readings are lost on the way. Each reading carries its device&rsquo;s sequence number. The readings are uploaded three times, with different network delays and gateway timing each time.</p>