SIG Mesh LPN automatically re-select FRIEND node.

[jhc]

Hi, everyone

A LPN ( Node-LP ) had selected one of nodes as its friend ( Node-F0 ), if Node-F0 is taken away, will the Node-LP automatically reselect other node as its friend?

[Hung Bui]

Hi Jhc, 

If the friend node is taken away the friendship will be timed out after a period of time. You will receive NRF_MESH_EVT_FRIENDSHIP_TERMINATED event when that happens. 
After that you can choose to re-initialize friendship again (with other nodes) by calling mesh_lpn_friend_request(). Please have a look at initiate_friendship() function in our LPN example. 
Note that you may need to wait for a period of time before you call mesh_lpn_friend_request() after you receive NRF_MESH_EVT_FRIENDSHIP_TERMINATED  event. If you call it in the same event, you may receive NRF_ERROR_INVALID_STATE error. 

[jhc]

Thank you!