Targeting S+ (version 31 and above) requires that one of FLAG_IMMUTABLE or FLAG_MUTABLE be specified when creating a PendingIntent. I got it after updating target SDK to 31. the error always come after AlarmPingSender. But i dont know any class that used AlarmPingSender.
2021-10-31 10:43:04.990 17031-17341/com.app.mobile D/AlarmPingSender: Register alarmreceiver to MqttServiceMqttService.pingSender.com.app.mobile-2e24ccbde048f2e91635651784
2021-10-31 10:43:04.993 17031-17341/com.app.mobile E/AndroidRuntime: FATAL EXCEPTION: MQTT Rec: com.app.mobile-2e24ccbde048f2e91635651784
Process: com.app.mobile, PID: 17031
java.lang.IllegalArgumentException: com.app.mobile: Targeting S+ (version 31 and above) requires that one of FLAG_IMMUTABLE or FLAG_MUTABLE be specified when creating a PendingIntent.
Strongly consider using FLAG_IMMUTABLE, only use FLAG_MUTABLE if some functionality depends on the PendingIntent being mutable, e.g. if it needs to be used with inline replies or bubbles.
at android.app.PendingIntent.checkFlags(PendingIntent.java:375)
at android.app.PendingIntent.getBroadcastAsUser(PendingIntent.java:645)
at android.app.PendingIntent.getBroadcast(PendingIntent.java:632)
at org.eclipse.paho.android.service.AlarmPingSender.start(AlarmPingSender.java:76)
at org.eclipse.paho.client.mqttv3.internal.ClientState.connected(ClientState.java:1150)
at org.eclipse.paho.client.mqttv3.internal.ClientState.notifyReceivedAck(ClientState.java:987)
at org.eclipse.paho.client.mqttv3.internal.CommsReceiver.run(CommsReceiver.java:118)
at java.lang.Thread.run(Thread.java:920)
After several attempt to fix this, i gave up and try to contact Qiscus. And they release new version that handle this Pending Intent behaviour change. So if anyone use Qiscus and got this error, you can use latest tag
https://github.com/qiscus/qiscus-sdk-android/releases/tag/1.3.35