Configure the Alert Button

PowerMgr - Set All Wake-Up Sources to Turn on. This wakes the device if it is in Sleep mode.

Intent - Create a new setting:

Mode - Set to Schedule sending of Intent on key presses.
Keep Device Awake - Enable this option to keep the device awake after the short key press.
Key Identifier - Select a remappable key. For example, Rear Button.
Android Action Name - Enter the action name. For example, to initiate a call, enter android.intent.action.CALL.
URI - Enter the URI. For example, to place a call to a phone number, enter tel:123456789.

KeyMappingMgr - Modify the default behavior of the button. It is recommended to set this to

None

. Otherwise, the button performs its default behavior in addition to sending an alert.