Starting BBSim API Server
Adding SerialNumber to GetDeviceInfo response (it's now required by
VOLTHA)

Change-Id: If726b5c313b6a424f54682aef68c001f6de51b57
diff --git a/api/bbsim/bbsim.proto b/api/bbsim/bbsim.proto
new file mode 100644
index 0000000..f49023b
--- /dev/null
+++ b/api/bbsim/bbsim.proto
@@ -0,0 +1,47 @@
+// Copyright (c) 2018 Open Networking Foundation
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at:
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+syntax = "proto3";
+package bbsim;
+
+message PONPort {
+    int32 ID = 1;
+    string OperState = 2;
+}
+
+message NNIPort {
+    int32 ID = 1;
+    string OperState = 2;
+}
+
+message Olt {
+    int32 ID = 1;
+    string OperState = 2;
+    repeated NNIPort NNIPorts = 3;
+    repeated PONPort PONPorts = 4;
+}
+
+message VersionNumber {
+    string version = 1;
+    string buildTime = 2;
+    string commitHash = 3;
+    string gitStatus = 4;
+}
+
+message Empty {}
+
+service BBSim {
+    rpc Version(Empty) returns (VersionNumber) {}
+    rpc GetOlt(Empty) returns (Olt) {}
+}
\ No newline at end of file