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offline queue

The fixed-size buffer where a device keeps readings it couldn't send yet.

An offline queue is a bounded first-in-first-out buffer, often a ring buffer, whose capacity and drop policy decide which readings survive a long outage.

Examples

  • An 8-hour outage at one 24-byte reading per minute needs 480 slots, about 11 KB of the ESP32's RAM.

  • A queue of 8 slots holds only 8 of the 12 readings taken during a 120 s outage at one reading every 10 s.

See also

store and forward drop policy at-least-once delivery
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