watchOS.ts

Purpose

This module delivers core body temperature predictions to a paired Apple Watch using react-native-watch-connectivity. It attempts a foreground message first and falls back to background user-info transfer if the watch is not reachable.

Its responsibilities include:

• Sending a { event, value } payload to the watch via sendMessage
• Falling back to transferUserInfo when the watch is out of foreground range
• Logging the outcome of both delivery paths

Invariants

Foreground-First, Background Fallback

sendMessage is always attempted first.

If it fails (watch not reachable, app not in foreground on watch side), the error callback immediately calls transferUserInfo with the same payload. transferUserInfo queues the data for delivery when the watch is next reachable.

Fire-and-Forget

sendCBTToWatchOS returns void and does not await the delivery outcome.

Callers in predictionHeatRisk.ts do not need to await this function; a failed delivery is logged but does not block the prediction result.

Payload Shape

{ event: 'message', value: coreTempC }

Exports

sendCBTToWatchOS(...)

function sendCBTToWatchOS(coreTempC: number): void

Sends the core body temperature to the paired Apple Watch. Logs the delivery outcome. Never throws.

Parameters