Exempting App in Huawei Power Manager

Open Advanced settings
Select Battery manager
Select Protected apps
Select SMS Tracker
Detailed power info

Open Advanced settings.

Select "Battery manager"

Select "Protected apps"

Select "SMS Tracker"

Detailed power info.

Your done! Good job!

Open your Android Settings and scroll down to the "Advanced settings" item and select it.

Look for "Battery manager" and select it.

Select "Protected apps".

Look for "SMS Tracker" and select it.

Set "Power-intensive prompt" to OFF.
Set "System wakeup" to ON.
Set "Keep running after screen off" to ON.