Dynamic parent selection delay based on trickle i_min.

Parent select delay min is 15 seconds or dynamic based on i_min. Bigger value is selected.

Change-Id: Ieb53162a6232c329ce48f2bfb99eb9dd149e1034

source/RPL/rpl_control.c

@@ -1012,7 +1012,7 @@ static buffer_t *rpl_control_dio_handler(protocol_interface_info_entry_t *cur, r
         rpl_instance_consistent_rx(instance);
     }
 
-    rpl_instance_neighbours_changed(instance);
+    rpl_instance_neighbours_changed(instance, dodag);
 
     return buffer_free(buf);
 

source/RPL/rpl_upward.c

@@ -427,7 +427,7 @@ void rpl_delete_neighbour(rpl_instance_t *instance, rpl_neighbour_t *neighbour)
     }
     if (neighbour->dodag_parent) {
         rpl_instance_remove_system_routes_through_parent(instance, neighbour);
-        rpl_instance_neighbours_changed(instance);
+        rpl_instance_neighbours_changed(instance, NULL);
     }
 
     rpl_free(neighbour, sizeof *neighbour);
@@ -1171,10 +1171,18 @@ bool rpl_instance_purge(rpl_instance_t *instance)
     return false;
 }
 
-void rpl_instance_neighbours_changed(rpl_instance_t *instance)
+void rpl_instance_neighbours_changed(rpl_instance_t *instance, const rpl_dodag_t *dodag)
 {
     instance->neighbours_changed = true;
-    rpl_instance_trigger_parent_selection(instance, rpl_policy_dio_parent_selection_delay(instance->domain));
+    uint16_t delay = rpl_policy_dio_parent_selection_delay(instance->domain);
+    if (dodag) {
+        //Convert imin 100ms tick to seconds
+        uint16_t i_min_delay = dodag->dio_timer_params.Imin / 10;
+        if (i_min_delay > delay) {
+            delay = i_min_delay;
+        }
+    }
+    rpl_instance_trigger_parent_selection(instance, delay);
 }
 
 static void rpl_instance_remove_parents(rpl_instance_t *instance)

source/RPL/rpl_upward.h

@@ -135,7 +135,7 @@ void rpl_neighbour_update_dodag_version(rpl_neighbour_t *neighbour, rpl_dodag_ve
 bool rpl_neighbour_update_dtsn(rpl_neighbour_t *neighbour, uint8_t dtsn);
 rpl_instance_t *rpl_neighbour_instance(const rpl_neighbour_t *neighbour);
 
-void rpl_instance_neighbours_changed(rpl_instance_t *instance);
+void rpl_instance_neighbours_changed(rpl_instance_t *instance, const rpl_dodag_t *dodag);
 void rpl_instance_run_parent_selection(rpl_instance_t *instance);
 
 void rpl_upward_print_instance(rpl_instance_t *instance, route_print_fn_t *print_fn);

test/nanostack/unittest/stub/rpl_upward_stub.c

@@ -382,7 +382,7 @@ bool rpl_instance_purge(rpl_instance_t *instance)
     return false;
 }
 
-void rpl_instance_neighbours_changed(rpl_instance_t *instance)
+void rpl_instance_neighbours_changed(rpl_instance_t *instance, const rpl_dodag_t *dodag)
 {
 }