diff --git a/go/gosdn/csbi/csbi.pb.go b/go/gosdn/csbi/csbi.pb.go
index fe4fd7c0b3a92ab67ddbae5d0dd03a1657da15f1..16bec3cb6164bfa7f849b693f862b6bc6729ec28 100644
--- a/go/gosdn/csbi/csbi.pb.go
+++ b/go/gosdn/csbi/csbi.pb.go
@@ -119,7 +119,117 @@ func (x DeleteResponseStatus) Number() protoreflect.EnumNumber {
 
 // Deprecated: Use DeleteResponseStatus.Descriptor instead.
 func (DeleteResponseStatus) EnumDescriptor() ([]byte, []int) {
-	return file_gosdn_csbi_csbi_proto_rawDescGZIP(), []int{6, 0}
+	return file_gosdn_csbi_csbi_proto_rawDescGZIP(), []int{8, 0}
+}
+
+type Syn struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Timestamp int64  `protobuf:"varint,1,opt,name=timestamp,proto3" json:"timestamp,omitempty"` // Timestamp in nanoseconds since Epoch.
+	Id        string `protobuf:"bytes,2,opt,name=id,proto3" json:"id,omitempty"`
+	Address   string `protobuf:"bytes,3,opt,name=address,proto3" json:"address,omitempty"`
+}
+
+func (x *Syn) Reset() {
+	*x = Syn{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_gosdn_csbi_csbi_proto_msgTypes[0]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *Syn) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*Syn) ProtoMessage() {}
+
+func (x *Syn) ProtoReflect() protoreflect.Message {
+	mi := &file_gosdn_csbi_csbi_proto_msgTypes[0]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use Syn.ProtoReflect.Descriptor instead.
+func (*Syn) Descriptor() ([]byte, []int) {
+	return file_gosdn_csbi_csbi_proto_rawDescGZIP(), []int{0}
+}
+
+func (x *Syn) GetTimestamp() int64 {
+	if x != nil {
+		return x.Timestamp
+	}
+	return 0
+}
+
+func (x *Syn) GetId() string {
+	if x != nil {
+		return x.Id
+	}
+	return ""
+}
+
+func (x *Syn) GetAddress() string {
+	if x != nil {
+		return x.Address
+	}
+	return ""
+}
+
+type Ack struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Timestamp int64 `protobuf:"varint,1,opt,name=timestamp,proto3" json:"timestamp,omitempty"` // Timestamp in nanoseconds since Epoch.
+}
+
+func (x *Ack) Reset() {
+	*x = Ack{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_gosdn_csbi_csbi_proto_msgTypes[1]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *Ack) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*Ack) ProtoMessage() {}
+
+func (x *Ack) ProtoReflect() protoreflect.Message {
+	mi := &file_gosdn_csbi_csbi_proto_msgTypes[1]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use Ack.ProtoReflect.Descriptor instead.
+func (*Ack) Descriptor() ([]byte, []int) {
+	return file_gosdn_csbi_csbi_proto_rawDescGZIP(), []int{1}
+}
+
+func (x *Ack) GetTimestamp() int64 {
+	if x != nil {
+		return x.Timestamp
+	}
+	return 0
 }
 
 type GetRequest struct {
@@ -135,7 +245,7 @@ type GetRequest struct {
 func (x *GetRequest) Reset() {
 	*x = GetRequest{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_gosdn_csbi_csbi_proto_msgTypes[0]
+		mi := &file_gosdn_csbi_csbi_proto_msgTypes[2]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -148,7 +258,7 @@ func (x *GetRequest) String() string {
 func (*GetRequest) ProtoMessage() {}
 
 func (x *GetRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_gosdn_csbi_csbi_proto_msgTypes[0]
+	mi := &file_gosdn_csbi_csbi_proto_msgTypes[2]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -161,7 +271,7 @@ func (x *GetRequest) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use GetRequest.ProtoReflect.Descriptor instead.
 func (*GetRequest) Descriptor() ([]byte, []int) {
-	return file_gosdn_csbi_csbi_proto_rawDescGZIP(), []int{0}
+	return file_gosdn_csbi_csbi_proto_rawDescGZIP(), []int{2}
 }
 
 func (x *GetRequest) GetTimestamp() int64 {
@@ -197,7 +307,7 @@ type GetResponse struct {
 func (x *GetResponse) Reset() {
 	*x = GetResponse{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_gosdn_csbi_csbi_proto_msgTypes[1]
+		mi := &file_gosdn_csbi_csbi_proto_msgTypes[3]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -210,7 +320,7 @@ func (x *GetResponse) String() string {
 func (*GetResponse) ProtoMessage() {}
 
 func (x *GetResponse) ProtoReflect() protoreflect.Message {
-	mi := &file_gosdn_csbi_csbi_proto_msgTypes[1]
+	mi := &file_gosdn_csbi_csbi_proto_msgTypes[3]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -223,7 +333,7 @@ func (x *GetResponse) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use GetResponse.ProtoReflect.Descriptor instead.
 func (*GetResponse) Descriptor() ([]byte, []int) {
-	return file_gosdn_csbi_csbi_proto_rawDescGZIP(), []int{1}
+	return file_gosdn_csbi_csbi_proto_rawDescGZIP(), []int{3}
 }
 
 func (x *GetResponse) GetTimestamp() int64 {
@@ -253,7 +363,7 @@ type Deployment struct {
 func (x *Deployment) Reset() {
 	*x = Deployment{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_gosdn_csbi_csbi_proto_msgTypes[2]
+		mi := &file_gosdn_csbi_csbi_proto_msgTypes[4]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -266,7 +376,7 @@ func (x *Deployment) String() string {
 func (*Deployment) ProtoMessage() {}
 
 func (x *Deployment) ProtoReflect() protoreflect.Message {
-	mi := &file_gosdn_csbi_csbi_proto_msgTypes[2]
+	mi := &file_gosdn_csbi_csbi_proto_msgTypes[4]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -279,7 +389,7 @@ func (x *Deployment) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use Deployment.ProtoReflect.Descriptor instead.
 func (*Deployment) Descriptor() ([]byte, []int) {
-	return file_gosdn_csbi_csbi_proto_rawDescGZIP(), []int{2}
+	return file_gosdn_csbi_csbi_proto_rawDescGZIP(), []int{4}
 }
 
 func (x *Deployment) GetId() string {
@@ -315,7 +425,7 @@ type CreateRequest struct {
 func (x *CreateRequest) Reset() {
 	*x = CreateRequest{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_gosdn_csbi_csbi_proto_msgTypes[3]
+		mi := &file_gosdn_csbi_csbi_proto_msgTypes[5]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -328,7 +438,7 @@ func (x *CreateRequest) String() string {
 func (*CreateRequest) ProtoMessage() {}
 
 func (x *CreateRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_gosdn_csbi_csbi_proto_msgTypes[3]
+	mi := &file_gosdn_csbi_csbi_proto_msgTypes[5]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -341,7 +451,7 @@ func (x *CreateRequest) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use CreateRequest.ProtoReflect.Descriptor instead.
 func (*CreateRequest) Descriptor() ([]byte, []int) {
-	return file_gosdn_csbi_csbi_proto_rawDescGZIP(), []int{3}
+	return file_gosdn_csbi_csbi_proto_rawDescGZIP(), []int{5}
 }
 
 func (x *CreateRequest) GetTimestamp() int64 {
@@ -370,7 +480,7 @@ type CreateResponse struct {
 func (x *CreateResponse) Reset() {
 	*x = CreateResponse{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_gosdn_csbi_csbi_proto_msgTypes[4]
+		mi := &file_gosdn_csbi_csbi_proto_msgTypes[6]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -383,7 +493,7 @@ func (x *CreateResponse) String() string {
 func (*CreateResponse) ProtoMessage() {}
 
 func (x *CreateResponse) ProtoReflect() protoreflect.Message {
-	mi := &file_gosdn_csbi_csbi_proto_msgTypes[4]
+	mi := &file_gosdn_csbi_csbi_proto_msgTypes[6]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -396,7 +506,7 @@ func (x *CreateResponse) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use CreateResponse.ProtoReflect.Descriptor instead.
 func (*CreateResponse) Descriptor() ([]byte, []int) {
-	return file_gosdn_csbi_csbi_proto_rawDescGZIP(), []int{4}
+	return file_gosdn_csbi_csbi_proto_rawDescGZIP(), []int{6}
 }
 
 func (x *CreateResponse) GetTimestamp() int64 {
@@ -425,7 +535,7 @@ type DeleteRequest struct {
 func (x *DeleteRequest) Reset() {
 	*x = DeleteRequest{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_gosdn_csbi_csbi_proto_msgTypes[5]
+		mi := &file_gosdn_csbi_csbi_proto_msgTypes[7]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -438,7 +548,7 @@ func (x *DeleteRequest) String() string {
 func (*DeleteRequest) ProtoMessage() {}
 
 func (x *DeleteRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_gosdn_csbi_csbi_proto_msgTypes[5]
+	mi := &file_gosdn_csbi_csbi_proto_msgTypes[7]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -451,7 +561,7 @@ func (x *DeleteRequest) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use DeleteRequest.ProtoReflect.Descriptor instead.
 func (*DeleteRequest) Descriptor() ([]byte, []int) {
-	return file_gosdn_csbi_csbi_proto_rawDescGZIP(), []int{5}
+	return file_gosdn_csbi_csbi_proto_rawDescGZIP(), []int{7}
 }
 
 func (x *DeleteRequest) GetTimestamp() int64 {
@@ -480,7 +590,7 @@ type DeleteResponse struct {
 func (x *DeleteResponse) Reset() {
 	*x = DeleteResponse{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_gosdn_csbi_csbi_proto_msgTypes[6]
+		mi := &file_gosdn_csbi_csbi_proto_msgTypes[8]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -493,7 +603,7 @@ func (x *DeleteResponse) String() string {
 func (*DeleteResponse) ProtoMessage() {}
 
 func (x *DeleteResponse) ProtoReflect() protoreflect.Message {
-	mi := &file_gosdn_csbi_csbi_proto_msgTypes[6]
+	mi := &file_gosdn_csbi_csbi_proto_msgTypes[8]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -506,7 +616,7 @@ func (x *DeleteResponse) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use DeleteResponse.ProtoReflect.Descriptor instead.
 func (*DeleteResponse) Descriptor() ([]byte, []int) {
-	return file_gosdn_csbi_csbi_proto_rawDescGZIP(), []int{6}
+	return file_gosdn_csbi_csbi_proto_rawDescGZIP(), []int{8}
 }
 
 func (x *DeleteResponse) GetTimestamp() int64 {
@@ -530,71 +640,81 @@ var file_gosdn_csbi_csbi_proto_rawDesc = []byte{
 	0x69, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x12, 0x0a, 0x67, 0x6f, 0x73, 0x64, 0x6e, 0x2e, 0x63,
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 }
 
 var (
@@ -610,36 +730,40 @@ func file_gosdn_csbi_csbi_proto_rawDescGZIP() []byte {
 }
 
 var file_gosdn_csbi_csbi_proto_enumTypes = make([]protoimpl.EnumInfo, 2)
-var file_gosdn_csbi_csbi_proto_msgTypes = make([]protoimpl.MessageInfo, 7)
+var file_gosdn_csbi_csbi_proto_msgTypes = make([]protoimpl.MessageInfo, 9)
 var file_gosdn_csbi_csbi_proto_goTypes = []interface{}{
 	(State)(0),                        // 0: gosdn.csbi.State
 	(DeleteResponseStatus)(0),         // 1: gosdn.csbi.DeleteResponse.status
-	(*GetRequest)(nil),                // 2: gosdn.csbi.GetRequest
-	(*GetResponse)(nil),               // 3: gosdn.csbi.GetResponse
-	(*Deployment)(nil),                // 4: gosdn.csbi.Deployment
-	(*CreateRequest)(nil),             // 5: gosdn.csbi.CreateRequest
-	(*CreateResponse)(nil),            // 6: gosdn.csbi.CreateResponse
-	(*DeleteRequest)(nil),             // 7: gosdn.csbi.DeleteRequest
-	(*DeleteResponse)(nil),            // 8: gosdn.csbi.DeleteResponse
-	(*transport.TransportOption)(nil), // 9: gosdn.transport.TransportOption
+	(*Syn)(nil),                       // 2: gosdn.csbi.Syn
+	(*Ack)(nil),                       // 3: gosdn.csbi.Ack
+	(*GetRequest)(nil),                // 4: gosdn.csbi.GetRequest
+	(*GetResponse)(nil),               // 5: gosdn.csbi.GetResponse
+	(*Deployment)(nil),                // 6: gosdn.csbi.Deployment
+	(*CreateRequest)(nil),             // 7: gosdn.csbi.CreateRequest
+	(*CreateResponse)(nil),            // 8: gosdn.csbi.CreateResponse
+	(*DeleteRequest)(nil),             // 9: gosdn.csbi.DeleteRequest
+	(*DeleteResponse)(nil),            // 10: gosdn.csbi.DeleteResponse
+	(*transport.TransportOption)(nil), // 11: gosdn.transport.TransportOption
 }
 var file_gosdn_csbi_csbi_proto_depIdxs = []int32{
-	4, // 0: gosdn.csbi.GetResponse.deployments:type_name -> gosdn.csbi.Deployment
-	0, // 1: gosdn.csbi.Deployment.state:type_name -> gosdn.csbi.State
-	9, // 2: gosdn.csbi.CreateRequest.TransportOption:type_name -> gosdn.transport.TransportOption
-	4, // 3: gosdn.csbi.CreateResponse.deployments:type_name -> gosdn.csbi.Deployment
-	1, // 4: gosdn.csbi.DeleteResponse.Status:type_name -> gosdn.csbi.DeleteResponse.status
-	2, // 5: gosdn.csbi.csbi.Get:input_type -> gosdn.csbi.GetRequest
-	5, // 6: gosdn.csbi.csbi.Create:input_type -> gosdn.csbi.CreateRequest
-	7, // 7: gosdn.csbi.csbi.Delete:input_type -> gosdn.csbi.DeleteRequest
-	3, // 8: gosdn.csbi.csbi.Get:output_type -> gosdn.csbi.GetResponse
-	6, // 9: gosdn.csbi.csbi.Create:output_type -> gosdn.csbi.CreateResponse
-	8, // 10: gosdn.csbi.csbi.Delete:output_type -> gosdn.csbi.DeleteResponse
-	8, // [8:11] is the sub-list for method output_type
-	5, // [5:8] is the sub-list for method input_type
-	5, // [5:5] is the sub-list for extension type_name
-	5, // [5:5] is the sub-list for extension extendee
-	0, // [0:5] is the sub-list for field type_name
+	6,  // 0: gosdn.csbi.GetResponse.deployments:type_name -> gosdn.csbi.Deployment
+	0,  // 1: gosdn.csbi.Deployment.state:type_name -> gosdn.csbi.State
+	11, // 2: gosdn.csbi.CreateRequest.TransportOption:type_name -> gosdn.transport.TransportOption
+	6,  // 3: gosdn.csbi.CreateResponse.deployments:type_name -> gosdn.csbi.Deployment
+	1,  // 4: gosdn.csbi.DeleteResponse.Status:type_name -> gosdn.csbi.DeleteResponse.status
+	4,  // 5: gosdn.csbi.csbi.Get:input_type -> gosdn.csbi.GetRequest
+	7,  // 6: gosdn.csbi.csbi.Create:input_type -> gosdn.csbi.CreateRequest
+	9,  // 7: gosdn.csbi.csbi.Delete:input_type -> gosdn.csbi.DeleteRequest
+	2,  // 8: gosdn.csbi.csbi.Hello:input_type -> gosdn.csbi.Syn
+	5,  // 9: gosdn.csbi.csbi.Get:output_type -> gosdn.csbi.GetResponse
+	8,  // 10: gosdn.csbi.csbi.Create:output_type -> gosdn.csbi.CreateResponse
+	10, // 11: gosdn.csbi.csbi.Delete:output_type -> gosdn.csbi.DeleteResponse
+	3,  // 12: gosdn.csbi.csbi.Hello:output_type -> gosdn.csbi.Ack
+	9,  // [9:13] is the sub-list for method output_type
+	5,  // [5:9] is the sub-list for method input_type
+	5,  // [5:5] is the sub-list for extension type_name
+	5,  // [5:5] is the sub-list for extension extendee
+	0,  // [0:5] is the sub-list for field type_name
 }
 
 func init() { file_gosdn_csbi_csbi_proto_init() }
@@ -649,7 +773,7 @@ func file_gosdn_csbi_csbi_proto_init() {
 	}
 	if !protoimpl.UnsafeEnabled {
 		file_gosdn_csbi_csbi_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*GetRequest); i {
+			switch v := v.(*Syn); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -661,7 +785,7 @@ func file_gosdn_csbi_csbi_proto_init() {
 			}
 		}
 		file_gosdn_csbi_csbi_proto_msgTypes[1].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*GetResponse); i {
+			switch v := v.(*Ack); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -673,7 +797,7 @@ func file_gosdn_csbi_csbi_proto_init() {
 			}
 		}
 		file_gosdn_csbi_csbi_proto_msgTypes[2].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*Deployment); i {
+			switch v := v.(*GetRequest); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -685,7 +809,7 @@ func file_gosdn_csbi_csbi_proto_init() {
 			}
 		}
 		file_gosdn_csbi_csbi_proto_msgTypes[3].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*CreateRequest); i {
+			switch v := v.(*GetResponse); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -697,7 +821,7 @@ func file_gosdn_csbi_csbi_proto_init() {
 			}
 		}
 		file_gosdn_csbi_csbi_proto_msgTypes[4].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*CreateResponse); i {
+			switch v := v.(*Deployment); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -709,7 +833,7 @@ func file_gosdn_csbi_csbi_proto_init() {
 			}
 		}
 		file_gosdn_csbi_csbi_proto_msgTypes[5].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*DeleteRequest); i {
+			switch v := v.(*CreateRequest); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -721,6 +845,30 @@ func file_gosdn_csbi_csbi_proto_init() {
 			}
 		}
 		file_gosdn_csbi_csbi_proto_msgTypes[6].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*CreateResponse); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_gosdn_csbi_csbi_proto_msgTypes[7].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*DeleteRequest); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_gosdn_csbi_csbi_proto_msgTypes[8].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*DeleteResponse); i {
 			case 0:
 				return &v.state
@@ -739,7 +887,7 @@ func file_gosdn_csbi_csbi_proto_init() {
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_gosdn_csbi_csbi_proto_rawDesc,
 			NumEnums:      2,
-			NumMessages:   7,
+			NumMessages:   9,
 			NumExtensions: 0,
 			NumServices:   1,
 		},
diff --git a/go/gosdn/csbi/csbi_grpc.pb.go b/go/gosdn/csbi/csbi_grpc.pb.go
index 74028ead4e3ee7df759752ec30371bea07760e42..de64f86a32302b3c82b6dded0972084c4bdba06e 100644
--- a/go/gosdn/csbi/csbi_grpc.pb.go
+++ b/go/gosdn/csbi/csbi_grpc.pb.go
@@ -20,6 +20,7 @@ type CsbiClient interface {
 	Get(ctx context.Context, in *GetRequest, opts ...grpc.CallOption) (*GetResponse, error)
 	Create(ctx context.Context, in *CreateRequest, opts ...grpc.CallOption) (*CreateResponse, error)
 	Delete(ctx context.Context, in *DeleteRequest, opts ...grpc.CallOption) (*DeleteResponse, error)
+	Hello(ctx context.Context, in *Syn, opts ...grpc.CallOption) (*Ack, error)
 }
 
 type csbiClient struct {
@@ -57,6 +58,15 @@ func (c *csbiClient) Delete(ctx context.Context, in *DeleteRequest, opts ...grpc
 	return out, nil
 }
 
+func (c *csbiClient) Hello(ctx context.Context, in *Syn, opts ...grpc.CallOption) (*Ack, error) {
+	out := new(Ack)
+	err := c.cc.Invoke(ctx, "/gosdn.csbi.csbi/Hello", in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
 // CsbiServer is the server API for Csbi service.
 // All implementations must embed UnimplementedCsbiServer
 // for forward compatibility
@@ -64,6 +74,7 @@ type CsbiServer interface {
 	Get(context.Context, *GetRequest) (*GetResponse, error)
 	Create(context.Context, *CreateRequest) (*CreateResponse, error)
 	Delete(context.Context, *DeleteRequest) (*DeleteResponse, error)
+	Hello(context.Context, *Syn) (*Ack, error)
 	mustEmbedUnimplementedCsbiServer()
 }
 
@@ -80,6 +91,9 @@ func (*UnimplementedCsbiServer) Create(context.Context, *CreateRequest) (*Create
 func (*UnimplementedCsbiServer) Delete(context.Context, *DeleteRequest) (*DeleteResponse, error) {
 	return nil, status.Errorf(codes.Unimplemented, "method Delete not implemented")
 }
+func (*UnimplementedCsbiServer) Hello(context.Context, *Syn) (*Ack, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method Hello not implemented")
+}
 func (*UnimplementedCsbiServer) mustEmbedUnimplementedCsbiServer() {}
 
 func RegisterCsbiServer(s *grpc.Server, srv CsbiServer) {
@@ -140,6 +154,24 @@ func _Csbi_Delete_Handler(srv interface{}, ctx context.Context, dec func(interfa
 	return interceptor(ctx, in, info, handler)
 }
 
+func _Csbi_Hello_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(Syn)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(CsbiServer).Hello(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/gosdn.csbi.csbi/Hello",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(CsbiServer).Hello(ctx, req.(*Syn))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
 var _Csbi_serviceDesc = grpc.ServiceDesc{
 	ServiceName: "gosdn.csbi.csbi",
 	HandlerType: (*CsbiServer)(nil),
@@ -156,6 +188,10 @@ var _Csbi_serviceDesc = grpc.ServiceDesc{
 			MethodName: "Delete",
 			Handler:    _Csbi_Delete_Handler,
 		},
+		{
+			MethodName: "Hello",
+			Handler:    _Csbi_Hello_Handler,
+		},
 	},
 	Streams:  []grpc.StreamDesc{},
 	Metadata: "gosdn/csbi/csbi.proto",
diff --git a/proto/gosdn/csbi/csbi.proto b/proto/gosdn/csbi/csbi.proto
index cee294887d07122222af76f22f5335b823d9bc22..50fa7d0ef75862d4d5325f90f653ed17b0963fbc 100644
--- a/proto/gosdn/csbi/csbi.proto
+++ b/proto/gosdn/csbi/csbi.proto
@@ -10,6 +10,17 @@ service csbi {
   rpc Get(GetRequest) returns (GetResponse);
   rpc Create(CreateRequest) returns (CreateResponse);
   rpc Delete(DeleteRequest) returns (DeleteResponse);
+  rpc Hello(Syn) returns (Ack);
+}
+
+message Syn {
+  int64 timestamp = 1;          // Timestamp in nanoseconds since Epoch.
+  string id = 2;
+  string address = 3;
+}
+
+message Ack {
+  int64 timestamp = 1;          // Timestamp in nanoseconds since Epoch.
 }
 
 message GetRequest {