low power node without friendship

Hi Support team,

nrf5 sdk for mesh 5.0,  nrf5 sdk 17.0.2, s132, SES;

We are trying to understand the LPN feature based on the LPN example because in our scenario there are a few node in the mesh network which will work under low power mode.   These low power nodes (such as switches) don't need to receive messages, so we really want to implement the solution without the friendship, without the friend nodes.

The low power node just works like this: the gpio interrupt wakes up the node and sends a message, and then go to sleep.  We have considered the iv update: in the life of the low power node, the sequence number cann't be wrapped since the number of the sent messages is not large enough. 

Is it possible to implement the solution like that mentioned above? And where should we change from the lpn example? 

If it cannot be implemented based on the LPN example, is there a nother approach making the node work under the low power mode (like the above description)? 

Thanks in advance!

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