Garmin Connect now offers a Personal API: a person creates a key for
their own account and any client can buy short-lived tokens with it.
HealthLog takes that key in a new Garmin card, checks it with Garmin
before storing it sealed on the user row, and polls every hour.
- Transport: key exchange with a per-process token cache keyed on the
key, one re-exchange on a refused token and then reauth_required, the
429 Retry-After carried to the caller, the China host tried when the
global one does not know the key, answers read with a byte cap, all
egress through safeFetch to the two fixed hosts.
- Sync: daily summaries, sleep summaries, HRV, weigh-ins and the
activity search, chunked to each resource's documented range, read one
after another and stopped at the first rate limit; today's menstrual
cycle summary adds logged period days the person has not logged.
- Backfill: a resumable walk through the shared admission lane that
learns where the history starts from the daily summaries and the
activities, waits out Garmin's rate limit and stamps its marker.
- Types: GARMIN source; BODY_BATTERY and STRESS_LEVEL for Garmin's own
day scores, kept apart from the computed STRESS_SCORE; TRAINING_READINESS
and ACUTE_TRAINING_LOAD for figures a bridge pushes through the ingest
token. All four chart on the recovery page and sit on the ladders,
units, ranges, labels and report groups like the device-native scores.
- Key expiry: learned from a token capped short of a day, else estimated
from the validity picked at connect; the card warns a week ahead and
asks for a new key once Garmin refuses the old one.
- Ledger, health, freshness, watchdog, backup classes, wipe plan,
encrypted-column registry, rotation script, OpenAPI and all ten
locales carry the new integration. The old "no Garmin connector" note
is gone.
Marc-André Bombeck
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