[Getting this warning] "No task registered for key BackgroundFetch"

[kopposh]

I have registered a headless task in my index.js to run when app is terminated on android along with BackgroundFetch.configure(code shown below) and receiving the below warning message.

WARN No task registered for key BackgroundFetch

useEffect(()=>{
    BackgroundFetch.registerHeadlessTask(BGHeadlessTask);
},[])

const BGHeadlessTask = async (event: { taskId: any; timeout: any }) => {
    let taskId = event.taskId;
    let isTimeout = event.timeout;
    if (isTimeout) {
      BackgroundFetch.finish(taskId);
      return;
    }
    try {
      const location = await BackgroundGeolocation.getCurrentPosition({
         timeout: 30,
          maximumAge: 1000,
          desiredAccuracy: 1,
          samples: 1,
          persist: false,
      });
      if (location && location?.coords) {
        await insertLocation({
          latitude: `${location?.coords?.latitude}`,
          longitude: `${location?.coords?.longitude}`,
          source: LOCATION_BG_TRACKING,
        });
      }
      BackgroundFetch.finish(taskId);
    } catch (err) {
      BackgroundFetch.finish(taskId);
    }
  }

const status = await BackgroundFetch.configure(
{
  minimumFetchInterval: 20,
 enableHeadless: true,
 stopOnTerminate: false,
},
async (taskId) => {
try {
   const location = await BackgroundGeolocation.getCurrentPosition({
         timeout: 30,
          maximumAge: 1000,
          desiredAccuracy: 1,
          samples: 1,
          persist: false,
      });
        insertLocation({
        latitude: ${location?.coords?.latitude},
        longitude: ${location?.coords?.longitude},
        });
}
} catch (err) {
console.log(
"BackgroundGeolocation.initBackgroundFetch error", err
);
}
    BackgroundFetch.finish(taskId);
},
async (taskId) => {
    BackgroundFetch.finish(taskId);
}
);

Your Environment

Plugin version: "react-native-background-geolocation": "^4.14.6",
Platform: iOS and Android
OS version: Android >=9, iOS >= 15
Device manufacturer / model: Tested on iPhone 15 pro, Mi A1
React Native version (react-native -v): Expo 50.0.18

Expected Behavior

Expecting the app to save the current location to local storage even when app is terminated.

Actual Behavior

Giving "No task registered for key BackgroundFetch" warning when app is terminated

Steps to Reproduce

Context

Debug logs

screenshot when app is terminated for a while and opened again after receiving the warning:

[christocracy]

Why are you registering a headlessTask within a useEffect block? There is nowhere that instructs that.

useEffect(()=>{
BackgroundFetch.registerHeadlessTask(BGHeadlessTask);
},[])

the docs for Config.enableHeadless instruct that a headlessTask is to be added directly to the index.js.

a warning showing TaskTimeout means that a task has timed out, whereBackgroundFetch.finish(taskId) is not being executed in time.

[kopposh]

Thank you for quick response. I will make the necessary changes to remove out of useEffect. and Does "No task registered for key BackgroundFetch" means task timeout?

[christocracy]

There is no possible way that a headlessTask can operate correctly when registered within a useEffect block. All other queries about any warnings received are moot.

[github-actions]

This issue is stale because it has been open for 30 days with no activity.

[github-actions]

This issue was closed because it has been inactive for 14 days since being marked as stale.