Answers · Idempotent replay

Why must offline command replay be idempotent?

Andrej Albrecht By Andrej Albrecht Published August 2026 2 min read

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Direct answer

Offline commands must be idempotent because phones replay queues after reconnects, crashes, and app upgrades. Device and server handlers should ignore duplicate command IDs instead of repeating side effects. For example, a delayed pump-start command should not increment a usage counter twice or trigger two service tickets.

Published August 2026 · Last technically reviewed August 2026

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