MLE bootsrap and message timeout update

Fixed that MLE router synch can fail.

Added more time for unicast and multicast messages.
(cherry picked from commit 2c2053bc3237c9db40832b66e5881d800f98b8e8)

Author: Juha Heiskanen

source/6LoWPAN/Bootstraps/Generic/protocol_6lowpan_bootstrap.c

@@ -663,17 +663,17 @@ static uint16_t mle_router_synch(protocol_interface_info_entry_t *cur, const uin
     if (retrans) {
         if (destAddress) {
             timeout.retrans_max = 3;
-            timeout.timeout_init = 1;
-            timeout.timeout_max = 3;
+            timeout.timeout_init = 2;
+            timeout.timeout_max = 4;
         } else {
             timeout.retrans_max = 2;
-            timeout.timeout_init = 2;
+            timeout.timeout_init = 4;
             timeout.timeout_max = 4;
         }
     } else {
         timeout.retrans_max = 1;
-        timeout.timeout_init = 1;
-        timeout.timeout_max = 3;
+        timeout.timeout_init = 2;
+        timeout.timeout_max = 4;
     }
 
     timeout.delay = delay;
@@ -706,7 +706,7 @@ static int mle_router_accept_request_build(protocol_interface_info_entry_t *cur,
         bufId =  mle_service_msg_allocate(cur->id, 64, true,type);
         timeout.retrans_max = 2;
         timeout.timeout_init = 2;
-        timeout.timeout_max = 2;
+        timeout.timeout_max = 4;
     }
 
     if (bufId == 0) {
@@ -840,12 +840,14 @@ static bool mle_parent_link_req_cb(int8_t interface_id, uint16_t msgId, bool use
     if (usedAllRetries) {
         switch (cur->nwk_bootstrap_state) {
             case ER_MLE_LINK_REQ:
-            case ER_ROUTER_SYNCH:
             case ER_MLE_LINK_ADDRESS_SYNCH:
             case ER_MLE_LINK_SHORT_SYNCH:
                 tr_debug("Link synch fail %u", cur->nwk_bootstrap_state);
                 bootsrap_next_state_kick(ER_BOOTSTRAP_CONNECTION_DOWN, cur);
                 break;
+            case ER_ROUTER_SYNCH:
+                bootsrap_next_state_kick(ER_RPL_MC, cur);
+                break;
             default:
                 break;
         }
@@ -869,6 +871,7 @@ static bool mle_accept_request_cb(int8_t interface_id, uint16_t msgId, bool used
         //If message has been sent by MLE service sends MLE reject to clear link
         if (mle_service_check_msg_sent(msgId)) {
             uint8_t *address_ptr = mle_service_get_msg_destination_address_pointer(msgId);
+            tr_debug("No accept for Accept/Request");
             mle_service_reject_message_build(cur->id, address_ptr, false);
         }
         return false;
@@ -2728,6 +2731,7 @@ static void protocol_6lowpan_generate_link_reject(protocol_interface_info_entry_
         address[8] ^= 2;
     }
     if (mac_helper_default_security_level_get(cur)) {
+        tr_debug("Drop link by asymmetric security");
         mle_service_reject_message_build(cur->id, address, false);
         return;
     }