Merge "split availability command into request and response"
diff --git a/automotive/vehicle/2.1/types.hal b/automotive/vehicle/2.1/types.hal
index 5594d19..7be611c 100644
--- a/automotive/vehicle/2.1/types.hal
+++ b/automotive/vehicle/2.1/types.hal
@@ -588,14 +588,17 @@
   /* A client declaring layers offering. */
   OFFERING = 4,
 
-  /* Update for the available layers. */
-  AVAILABILITY = 5,
+  /* Requesting the list of available layers. */
+  AVAILABILITY_REQUEST = 5,
+
+  /* Returning the list of available layers. */
+  AVAILABILITY_RESPONSE = 6,
 
   /** Requesting layers that have subscribers. */
-  SUBSCRIPTION_REQUEST = 6,
+  SUBSCRIPTION_REQUEST = 7,
 
   /** Returning layers that have subscribers. */
-  SUBSCRIPTION_RESPONSE = 7,
+  SUBSCRIPTION_RESPONSE = 8,
 };
 
 /**