diff --git a/connections/status.cc b/connections/status.cc
index 976f455e..46216ab3 100644
--- a/connections/status.cc
+++ b/connections/status.cc
@@ -53,6 +53,12 @@ std::string Status::ToString() const {
       return "kWifiLanError";
     case Status::kPayloadUnknown:
       return "kPayloadUnknown";
+    case Status::kReset:
+      return "kReset";
+    case Status::kTimeout:
+      return "kTimeout";
+    case Status::kUnknown:
+      // fall through
     default:
       return "Unknown";
   }
diff --git a/connections/status.h b/connections/status.h
index cc40005c..0c2c1fa0 100644
--- a/connections/status.h
+++ b/connections/status.h
@@ -22,7 +22,7 @@ namespace connections {
 
 // Protocol operation result: kSuccess, if operation was successful;
 // descriptive error code otherwise.
-// LINT.IfChange
+// LINT.IfChange(status_enum)
 struct Status {
   // Status is a struct, so it is possible to pass some context about failure,
   // by adding extra fields to it when necessary, and not change any of the
@@ -44,6 +44,9 @@ struct Status {
     kBleError,
     kWifiLanError,
     kPayloadUnknown,
+    kReset,
+    kTimeout,
+    kUnknown,
     kNextValue,
   };
   Value value{kError};
@@ -53,9 +56,9 @@ struct Status {
   std::string ToString() const;
 };
 // LINT.ThenChange(
-//   //depot/google3/location/nearby/cpp/sharing/implementation/nearby_connections_manager.cc:24
-//   //depot/google3/location/nearby/cpp/sharing/implementation/nearby_connections_types.h:46
-//   //depot/google3/location/nearby/cpp/sharing/implementation/nearby_connections_types_test.cc
+//     ../sharing/nearby_connections_manager.cc:status_enum,
+//     ../sharing/nearby_connections_types.h:status_enum,
+//     ../sharing/nearby_connections_types_test.cc:status_enum
 // )
 
 inline bool operator==(const Status& a, const Status& b) {
diff --git a/connections/swift/NearbyCoreAdapter/Sources/GNCCoreAdapter.mm b/connections/swift/NearbyCoreAdapter/Sources/GNCCoreAdapter.mm
index e4395758..ef72eded 100644
--- a/connections/swift/NearbyCoreAdapter/Sources/GNCCoreAdapter.mm
+++ b/connections/swift/NearbyCoreAdapter/Sources/GNCCoreAdapter.mm
@@ -87,6 +87,12 @@ GNCStatus GNCStatusFromCppStatus(Status status) {
       return GNCStatusWifiLanError;
     case Status::kPayloadUnknown:
       return GNCStatusPayloadUnknown;
+    case Status::kReset:
+      return GNCStatusReset;
+    case Status::kTimeout:
+      return GNCStatusTimeout;
+    case Status::kUnknown:
+      return GNCStatusUnknown;
     case Status::kNextValue:
       return GNCStatusUnknown;
   }
diff --git a/connections/swift/NearbyCoreAdapter/Sources/GNCError.mm b/connections/swift/NearbyCoreAdapter/Sources/GNCError.mm
index 36c6d43e..db10fee7 100644
--- a/connections/swift/NearbyCoreAdapter/Sources/GNCError.mm
+++ b/connections/swift/NearbyCoreAdapter/Sources/GNCError.mm
@@ -65,6 +65,12 @@ NSError *NSErrorFromCppStatus(Status status) {
       return [NSError errorWithDomain:GNCErrorDomain code:GNCErrorWifiLanError userInfo:nil];
     case Status::kPayloadUnknown:
       return [NSError errorWithDomain:GNCErrorDomain code:GNCErrorPayloadUnknown userInfo:nil];
+    case Status::kReset:
+      return [NSError errorWithDomain:GNCErrorDomain code:GNCErrorReset userInfo:nil];
+    case Status::kTimeout:
+      return [NSError errorWithDomain:GNCErrorDomain code:GNCErrorTimeout userInfo:nil];
+    case Status::kUnknown:
+      return [NSError errorWithDomain:GNCErrorDomain code:GNCErrorUnknown userInfo:nil];
     case Status::kNextValue:
       return [NSError errorWithDomain:GNCErrorDomain code:GNCErrorUnknown userInfo:nil];
   }
diff --git a/connections/swift/NearbyCoreAdapter/Sources/Public/NearbyCoreAdapter/GNCConnectionDelegate.h b/connections/swift/NearbyCoreAdapter/Sources/Public/NearbyCoreAdapter/GNCConnectionDelegate.h
index 85c6aed6..84d22a27 100644
--- a/connections/swift/NearbyCoreAdapter/Sources/Public/NearbyCoreAdapter/GNCConnectionDelegate.h
+++ b/connections/swift/NearbyCoreAdapter/Sources/Public/NearbyCoreAdapter/GNCConnectionDelegate.h
@@ -35,6 +35,8 @@ typedef NS_CLOSED_ENUM(NSInteger, GNCStatus) {
   GNCStatusWifiLanError,
   GNCStatusPayloadUnknown,
   GNCStatusUnknown,
+  GNCStatusReset,
+  GNCStatusTimeout,
 };
 
 /**
diff --git a/connections/swift/NearbyCoreAdapter/Sources/Public/NearbyCoreAdapter/GNCError.h b/connections/swift/NearbyCoreAdapter/Sources/Public/NearbyCoreAdapter/GNCError.h
index 4242b676..76952324 100644
--- a/connections/swift/NearbyCoreAdapter/Sources/Public/NearbyCoreAdapter/GNCError.h
+++ b/connections/swift/NearbyCoreAdapter/Sources/Public/NearbyCoreAdapter/GNCError.h
@@ -38,4 +38,6 @@ typedef NS_ERROR_ENUM(GNCErrorDomain, GNCErrorCode){
     GNCErrorBleError,
     GNCErrorWifiLanError,
     GNCErrorPayloadUnknown,
+    GNCErrorReset,
+    GNCErrorTimeout,
 } NS_SWIFT_NAME(NearbyError);
diff --git a/proto/sharing_enums.proto b/proto/sharing_enums.proto
index abb3478d..b27fb956 100644
--- a/proto/sharing_enums.proto
+++ b/proto/sharing_enums.proto
@@ -312,6 +312,61 @@ enum AttachmentTransmissionStatus {
   FAILED_NULL_CONNECTION_DISCONNECTED = 19;
 }
 
+// Generic result status of NearbyConnections API calls.
+enum ConnectionLayerStatus {
+  // No status is available
+  CONNECTION_LAYER_STATUS_UNKNOWN = 0;
+  // The operation was successful.
+  CONNECTION_LAYER_STATUS_SUCCESS = 1;
+  // The operation failed, without any more information.
+  CONNECTION_LAYER_STATUS_ERROR = 2;
+  // The app called an API method out of order (i.e. another method is expected
+  // to be called first).
+  CONNECTION_LAYER_STATUS_OUT_OF_ORDER_API_CALL = 3;
+  // The app already has active operations (advertising, discovering, or
+  // connected to other devices) with another Strategy. Stop these operations on
+  // the current Strategy before trying to advertise or discover with a new
+  // Strategy.
+  CONNECTION_LAYER_STATUS_ALREADY_HAVE_ACTIVE_STRATEGY = 4;
+  // The app is already advertising; call StopAdvertising() before trying to
+  // advertise again.
+  CONNECTION_LAYER_STATUS_ALREADY_ADVERTISING = 5;
+  // The app is already discovering; call StopDiscovery() before trying to
+  // discover again.
+  CONNECTION_LAYER_STATUS_ALREADY_DISCOVERING = 6;
+  // NC is already listening for incoming connections from remote endpoints.
+  CONNECTION_LAYER_STATUS_ALREADY_LISTENING = 7;
+  // An attempt to read from/write to a connected remote endpoint failed. If
+  // this occurs repeatedly, consider invoking DisconnectFromEndpoint().
+  CONNECTION_LAYER_STATUS_END_POINT_IO_ERROR = 8;
+  // An attempt to interact with a remote endpoint failed because it's unknown
+  // to us -- it's either an endpoint that was never discovered, or an endpoint
+  // that never connected to us (both of which are indicative of bad input from
+  // the client app).
+  CONNECTION_LAYER_STATUS_END_POINT_UNKNOWN = 9;
+  // The remote endpoint rejected the connection request.
+  CONNECTION_LAYER_STATUS_CONNECTION_REJECTED = 10;
+  // The app is already connected to the specified endpoint. Multiple
+  // connections to a remote endpoint cannot be maintained simultaneously.
+  CONNECTION_LAYER_STATUS_ALREADY_CONNECTED_TO_END_POINT = 11;
+  // The remote endpoint is not connected; messages cannot be sent to it.
+  CONNECTION_LAYER_STATUS_NOT_CONNECTED_TO_END_POINT = 12;
+  // There was an error trying to use the device's Bluetooth capabilities.
+  CONNECTION_LAYER_STATUS_BLUETOOTH_ERROR = 13;
+  // There was an error trying to use the device's Bluetooth Low Energy
+  // capabilities.
+  CONNECTION_LAYER_STATUS_BLE_ERROR = 14;
+  // There was an error trying to use the device's Wi-Fi capabilities.
+  CONNECTION_LAYER_STATUS_WIFI_LAN_ERROR = 15;
+  // An attempt to interact with an in-flight Payload failed because it's
+  // unknown to us.
+  CONNECTION_LAYER_STATUS_PAYLOAD_UNKNOWN = 16;
+  // The connection was reset
+  CONNECTION_LAYER_STATUS_RESET = 17;
+  // The connection timed out
+  CONNECTION_LAYER_STATUS_TIMEOUT = 18;
+}
+
 // The status of processing attachments after receiver received payloads
 // successfully.
 enum ProcessReceivedAttachmentsStatus {