Wear OS 4, Passive Data, Heart Rate collecting not working in background

[amoledwatchfaces]

Background Heart Rate collection is not working on Wear OS 4. Tried with own app (PassiveListenerCallback) but also with PassiveData sample (PassiveDataService.kt)

[jluebbe]

@amoledwatchfaces Did you get this to work on Wear OS 4? I think I have the same issue.

[amoledwatchfaces]

Hi, it's not really an issue. Wear OS is killing app in the background after some time of inactivity. This applies for both PassiveListenerCallback / PassiveListenerService. I though that PassiveListenerService will work like WearableListenerService so it wont be killed by system but unfortunately, it's not the case.

[breanatate]

@jluebbe Are you also requesting the body sensors background permission?

[cancan101]

I solved this problem by requesting the BODY_SENSORS_BACKGROUND permission. Without doing so, once the app was closed, I no longer received updates (either data points or user activity).

I was a bit confused by the linked docs, however. It states that the app should "Check if BODY_SENSORS_BACKGROUND is granted. If not, request the permission" but then down below it states "the runtime permission dialog doesn't include the "Allow all the time" option. Instead, users must enable all-the-time background sensor access from system settings".

What is the point of checking (and requesting) the BODY_SENSORS_BACKGROUND if the user needs to enable it manually?

[amoledwatchfaces]

From my experience, even with BODY_SENSORS_BACKGROUND, Passive Listener Service is killed after few hours of inactivity on Wear OS 4. Callback is killed right after app is closed.