refactor RPL dis sending

if there is no RPL DIO connection made DIS message is sent

Author: Mika Tervonen

source/6LoWPAN/ws/ws_bootstrap.c

@@ -73,9 +73,9 @@ static const trickle_params_t trickle_params_pan_discovery = {
 
 static void ws_bootstrap_event_handler(arm_event_s *event);
 static void ws_bootstrap_state_change(protocol_interface_info_entry_t *cur, icmp_state_t nwk_bootstrap_state);
-static bool ws_bootstrap_state_active(struct protocol_interface_info_entry *cur);
+//static bool ws_bootstrap_state_active(struct protocol_interface_info_entry *cur);
+//static bool ws_bootstrap_state_wait_rpl(struct protocol_interface_info_entry *cur);
 static bool ws_bootstrap_state_discovery(struct protocol_interface_info_entry *cur);
-static bool ws_bootstrap_state_wait_rpl(struct protocol_interface_info_entry *cur);
 static int8_t ws_bootsrap_event_trig(ws_bootsrap_event_type_e event_type, int8_t interface_id, arm_library_event_priority_e priority, void *event_data);
 
 static bool ws_bootstrap_neighbor_info_request(struct protocol_interface_info_entry *interface, const uint8_t *mac_64, llc_neighbour_req_t * neighbor_buffer, bool request_new);
@@ -1058,10 +1058,6 @@ static void ws_bootstrap_rpl_activate(protocol_interface_info_entry_t *cur)
     rpl_control_force_leaf(protocol_6lowpan_rpl_domain, leaf);
 
     cur->ws_info->rpl_state = 0xff; // Set invalid state and learn from event
-    if (cur->bootsrap_mode == ARM_NWK_BOOTSRAP_MODE_6LoWPAN_ROUTER) {
-        // TODO Multicast DIS should be sent only if no DIO heard for some time
-        rpl_control_transmit_dis(cur->rpl_domain, cur, 0, 0, NULL, 0, ADDR_LINK_LOCAL_ALL_RPL_NODES);
-    }
 }
 
 static void ws_bootstrap_network_start(protocol_interface_info_entry_t *cur)
@@ -1146,6 +1142,14 @@ static void ws_bootstrap_start_configuration_learn(protocol_interface_info_entry
     trickle_start(&cur->ws_info->trickle_pan_config_solicit, &trickle_params_pan_discovery);
     trickle_inconsistent_heard(&cur->ws_info->trickle_pan_config_solicit, &trickle_params_pan_discovery);
 }
+static void ws_bootstrap_rpl_scan_start(protocol_interface_info_entry_t *cur)
+{
+    tr_debug("Start RPL learn");
+    // routers wait until RPL root is contacted
+     ws_bootstrap_state_change(cur, ER_RPL_SCAN);
+     // Set timeout for check to 30 -60 seconds
+     cur->bootsrap_state_machine_cnt = randLIB_get_random_in_range(WS_RPL_DIS_INITIAL_TIMEOUT/2,WS_RPL_DIS_INITIAL_TIMEOUT);
+}
 
 /*
  * Event transitions
@@ -1394,8 +1398,7 @@ static void ws_bootstrap_event_handler(arm_event_s *event)
         if (cur->bootsrap_mode == ARM_NWK_BOOTSRAP_MODE_6LoWPAN_BORDER_ROUTER) {
             ws_bootstrap_event_routing_ready(cur);
         } else {
-            // routers wait until RPL root is contacted
-             ws_bootstrap_state_change(cur, ER_RPL_SCAN);
+            ws_bootstrap_rpl_scan_start(cur);
          }
         break;
     case WS_ROUTING_READY:
@@ -1460,13 +1463,23 @@ void ws_bootstrap_rpl_wait_process(protocol_interface_info_entry_t *cur)
 {
 
     if (cur->ws_info->rpl_state == RPL_EVENT_DAO_DONE) {
-        // Trigger statemachine check
+        // RPL routing is ready
         ws_bootstrap_event_routing_ready(cur);
+    } else if (!rpl_control_have_dodag(cur->rpl_domain)){
+        // RPL not ready send DIS message if possible
+        if (cur->bootsrap_mode == ARM_NWK_BOOTSRAP_MODE_6LoWPAN_ROUTER) {
+            // TODO Multicast DIS should be sent only if no DIO heard for some time
+            rpl_control_transmit_dis(cur->rpl_domain, cur, 0, 0, NULL, 0, ADDR_LINK_LOCAL_ALL_RPL_NODES);
+        }
+        // set timer for next DIS
+        cur->bootsrap_state_machine_cnt = randLIB_get_random_in_range(WS_RPL_DIS_TIMEOUT/2, WS_RPL_DIS_TIMEOUT);
     }
     return;
 }
 
-static bool ws_bootstrap_state_active(struct protocol_interface_info_entry *cur)
+/*
+
+ static bool ws_bootstrap_state_active(struct protocol_interface_info_entry *cur)
 {
     if(cur->nwk_bootstrap_state == ER_BOOTSRAP_DONE) {
         return true;
@@ -1491,7 +1504,7 @@ static bool ws_bootstrap_state_wait_rpl(struct protocol_interface_info_entry *cu
     }
     return false;
 }
-
+*/
 static bool ws_bootstrap_state_discovery(struct protocol_interface_info_entry *cur)
 {
     if(cur->nwk_bootstrap_state == ER_ACTIVE_SCAN) {

source/6LoWPAN/ws/ws_common_defines.h

@@ -185,5 +185,14 @@ typedef struct ws_bs_ie {
 #define WS_NEIGHBOR_LINK_TIMEOUT 240
 #define WS_NEIGHBOR_NUD_TIMEOUT WS_NEIGHBOR_LINK_TIMEOUT / 2
 
+/*
+ * value when send the first RPL DIS in 100ms ticks. Value is randomized between timeout/2 - timeout
+ */
+#define WS_RPL_DIS_INITIAL_TIMEOUT 600
+/*
+ * value when send subsequent RPL DIS in 100 ms tics. Value is randomized between timeout/2 - timeout
+ */
+#define WS_RPL_DIS_TIMEOUT 1800
+
 
 #endif /* WS_COMMON_DEFINES_H_ */