Add message lost event (#673)

Signed-off-by: Ivan Santiago Paunovic <[email protected]>

Author: ivanpauno

rcl/include/rcl/event.h

@@ -39,6 +39,7 @@ typedef enum rcl_subscription_event_type_t
   RCL_SUBSCRIPTION_REQUESTED_DEADLINE_MISSED,
   RCL_SUBSCRIPTION_LIVELINESS_CHANGED,
   RCL_SUBSCRIPTION_REQUESTED_INCOMPATIBLE_QOS,
+  RCL_SUBSCRIPTION_MESSAGE_LOST,
 } rcl_subscription_event_type_t;
 
 /// rmw struct.

rcl/src/rcl/event.c

@@ -118,6 +118,9 @@ rcl_subscription_event_init(
     case RCL_SUBSCRIPTION_REQUESTED_INCOMPATIBLE_QOS:
       rmw_event_type = RMW_EVENT_REQUESTED_QOS_INCOMPATIBLE;
       break;
+    case RCL_SUBSCRIPTION_MESSAGE_LOST:
+      rmw_event_type = RMW_EVENT_MESSAGE_LOST;
+      break;
     default:
       RCL_SET_ERROR_MSG("Event type for subscription not supported");
       return RCL_RET_INVALID_ARGUMENT;