disable multicast NS for wisun

source/6LoWPAN/ws/ws_bootstrap.c

@@ -685,6 +685,21 @@ uint16_t ws_etx_read(protocol_interface_info_entry_t *interface, addrtype_t addr
     //tr_debug("ws_etx_read etx:%d", etx);
     return etx;
 }
+bool ws_bootstrap_nd_ns_transmit(protocol_interface_info_entry_t *cur, ipv6_neighbour_t *entry,  bool unicast, uint8_t seq)
+{
+    (void)cur;
+    (void)seq;
+
+    if (unicast) {
+        // Unicast NS is OK
+        return false;
+    }
+    // Fail the resolution
+    tr_warn("Link address lost for %s", trace_ipv6(entry->ip_address));
+    ipv6_neighbour_entry_remove(&cur->ipv6_neighbour_cache, entry);
+    // True means we skip the message sending
+    return true;
+}
 
 static int8_t ws_bootstrap_up(protocol_interface_info_entry_t *cur)
 {
@@ -728,6 +743,9 @@ static int8_t ws_bootstrap_up(protocol_interface_info_entry_t *cur)
     /* Disable NUD Probes */
     cur->ipv6_neighbour_cache.send_nud_probes = false;
     cur->ipv6_neighbour_cache.probe_avoided_routers = true;
+    /*Replace NS handler to disable multicast address queries */
+    cur->if_ns_transmit = ws_bootstrap_nd_ns_transmit;
+
     dhcp_client_init(cur->id);
     dhcp_client_configure(cur->id, true, true, true); //RENEW uses SOLICIT, Interface will use 1 instance for address get, IAID address hint is not used.
     dhcp_client_solicit_timeout_set(cur->id, WS_DHCP_SOLICIT_TIMEOUT, WS_DHCP_SOLICIT_MAX_RT, WS_DHCP_SOLICIT_MAX_RC);