ble_mesh: stack: Add option for lpn auto sub all-nodes.

components/bt/esp_ble_mesh/Kconfig.in

@@ -803,6 +803,13 @@ if BLE_MESH
             help
                 Maximum number of groups to which the LPN can subscribe.
 
+        config BLE_MESH_LPN_SUB_ALL_NODES_ADDR
+            bool "Automatically subscribe all nodes address"
+            default n
+            help
+                Automatically subscribe all nodes address when friendship
+                established.
+
     endif # BLE_MESH_LOW_POWER
 
     config BLE_MESH_FRIEND

components/bt/esp_ble_mesh/mesh_core/main.c

@@ -78,6 +78,11 @@ int bt_mesh_provision(const uint8_t net_key[16], uint16_t net_idx,
 
     memcpy(bt_mesh.dev_key, dev_key, 16);
 
+    if (IS_ENABLED(CONFIG_BLE_MESH_LOW_POWER) &&
+        IS_ENABLED(CONFIG_BLE_MESH_LPN_SUB_ALL_NODES_ADDR)) {
+        bt_mesh_lpn_group_add(BLE_MESH_ADDR_ALL_NODES);
+    }
+
     if (IS_ENABLED(CONFIG_BLE_MESH_SETTINGS)) {
         BT_DBG("Storing network information persistently");
         bt_mesh_store_net();
@@ -110,6 +115,12 @@ void bt_mesh_node_reset(void)
     bt_mesh_tx_reset();
 
     if (IS_ENABLED(CONFIG_BLE_MESH_LOW_POWER)) {
+        if (IS_ENABLED(CONFIG_BLE_MESH_LPN_SUB_ALL_NODES_ADDR)) {
+            uint16_t group = BLE_MESH_ADDR_ALL_NODES;
+
+            bt_mesh_lpn_group_del(&group, 1);
+        }
+
         bt_mesh_lpn_disable(true);
     }