For Huawei, the recommended solution is to disable the OS’ Battery Optimization for Bob:
Go to → Settings → Apps
Tap the 3-dots button → Special access → Battery optimization
On the top-left corner tap the “Not allowed” button and it to “All apps”
Search for Bob and select it → select “Don’t allow”
Another thing we recommend (if available on your model):
Phone settings → Battery → App launch and then set your app to “Manage manually” and make sure everything is turned on.
And last – "lock" bob, in order to prevent it from being closed by the OS:
Open the bob app
Tap the square icon at the bottom of the Android toolbar to see your recently opened apps
Find the bob screenshot and drag it down, then release it
Now a lock icon should appear on the bob screenshot
*Despite the term Battery optimization, switching to this state should not change the usage in a significant way. Bob is already optimized to use a very low battery power.