const RESUME_BACKOFF_STEP_SECS: u64 = 2;Expand description
Seconds added per attempt before retrying a stream that failed with an error.
Attempt 1 waits this long, attempt 2 twice as long, and so on — a spread that
covers roughly a quarter-minute of outage across the retry budget without
leaving the user staring at a dead notification when the network is truly gone.
Only read by the Android error callback (#[cfg(android)]), but compiled
and unit-tested on the host, hence allow(dead_code) off-Android.