keepAliveInBackground=true option is not functioning as expected on iOS (on Production)

[mschoi-ian]

Hi, thanks a lot for maintaining this great package.

Description:

keepAliveInBackground=true option is not functioning as expected on iOS (on Production) with the specified configuration.
When the app transitions to the background state, the recording stops immediately.
The recording resumes once the app returns to the foreground.

Expected behavior:

The recording task should continue to operate seamlessly, regardless of whether the app is in the foreground or background.

Steps to reproduce:

• Version: @siteed/expo-audio-stream: 1.11.4
• recordingConfig

const recordingConfig: RecordingConfig = {
    interval: chunkDuration,
    channels: 1,
    keepAwake: true,
    pointsPerSecond: 1,
    enableProcessing: true,
    autoResumeAfterInterruption: true,
    onAudioStream: processRecording
}

• configuration on app.json

[
    "@siteed/expo-audio-stream",
    {
        "enablePhoneStateHandling": true,
        "enableNotifications": true,
        "enableBackgroundAudio": true,
        "iosBackgroundModes": {
            "useVoIP": false,
            "useAudio": false,
            "useProcessing": true
        },
        "iosConfig": {
            "backgroundProcessingTitle": "Audio Recording",
            "keepAliveInBackground": true
        }
    }
]

[mschoi-ian]

On iOS (on production build):

When useVoIP: true and useAudio:true, recording in the background worked on the device.
However, the app could not be accepted due to the app store guidelines (the relevant feature issue: #85)

When useVoIP: false and useAudio:false, although the app was successfully accepted on the app store,
recording in the background did not work on the device.

Other related options were like the following:
• version: @siteed/expo-audio-stream: 1.11.4
• recordingConfig

...
keepAwake: true,
enableProcessing: true,
autoResumeAfterInterruption: true,
showNotification: false
...

• app.json

[
    "@siteed/expo-audio-stream",
    {
        "enablePhoneStateHandling": true,
        "enableNotifications": true,
        "enableBackgroundAudio": true,
        "iosBackgroundModes": {
            "useProcessing": true,
            ...
        },
        "iosConfig": {
            "backgroundProcessingTitle": "Audio Recording",
            "keepAliveInBackground": true
        }
    }
]

[mschoi-ian]

On Android (on production build):

•showNotification=true: Recording in the background works on the device. (No review issue on the play store)
•showNotification=false: Recording in the background does not work on the device. (No review issue on the play store)

Other related options were like the following:
• version: @siteed/expo-audio-stream: 1.11.4
• recordingConfig

...
keepAwake: true,
enableProcessing: true,
autoResumeAfterInterruption: true,
...

• app.json

[
    "@siteed/expo-audio-stream",
    {
        "enablePhoneStateHandling": true,
        "enableNotifications": true,
        "enableBackgroundAudio": true,
        "androidConfig": {
            ... (default)
        }
    }
]