AP_DroneCAN_DNA_Server : adding delay while logging 'CAND'

This delay was added since the logging of CAND data for node-IDs 15 and 24 were always missing. More details of this problem can be found here : https://carbonix.atlassian.net/jira/software/c/projects/SW/boards/42/timeline?selectedIssue=SW-398

libraries/AP_DroneCAN/AP_DroneCAN_DNA_Server.cpp

@@ -439,6 +439,13 @@ void AP_DroneCAN_DNA_Server::handleNodeInfo(const CanardRxTransfer& transfer, co
     if (transfer.source_node_id > MAX_NODE_ID) {
         return;
     }
+
+    // Temporary fix to address the missing nodes - 15 and 24
+    // Do not log until we are more than 30 seconds into boot
+    if (AP_HAL::millis() < 30000){
+        return;
+    }
+
     /*
       if we haven't logged this node then log it now
      */