diff --git a/VERSION b/VERSION
index c4e41f9..3704213 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-4.0.3
+4.0.3-dev
diff --git a/go/extension/extensions.pb.go b/go/extension/extensions.pb.go
new file mode 100644
index 0000000..9cfbe54
--- /dev/null
+++ b/go/extension/extensions.pb.go
@@ -0,0 +1,1091 @@
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// source: voltha_protos/extensions.proto
+
+package extension
+
+import (
+	context "context"
+	fmt "fmt"
+	proto "github.com/golang/protobuf/proto"
+	config "github.com/opencord/voltha-protos/v4/go/ext/config"
+	grpc "google.golang.org/grpc"
+	math "math"
+)
+
+// Reference imports to suppress errors if they are not otherwise used.
+var _ = proto.Marshal
+var _ = fmt.Errorf
+var _ = math.Inf
+
+// This is a compile-time assertion to ensure that this generated file
+// is compatible with the proto package it is being compiled against.
+// A compilation error at this line likely means your copy of the
+// proto package needs to be updated.
+const _ = proto.ProtoPackageIsVersion3 // please upgrade the proto package
+
+// AlarmConfig from public import voltha_protos/ext_config.proto
+type AlarmConfig = config.AlarmConfig
+type AlarmConfig_OnuItuPonAlarmConfig = config.AlarmConfig_OnuItuPonAlarmConfig
+
+// OnuItuPonAlarm from public import voltha_protos/ext_config.proto
+type OnuItuPonAlarm = config.OnuItuPonAlarm
+type OnuItuPonAlarm_RateThresholdConfig_ = config.OnuItuPonAlarm_RateThresholdConfig_
+type OnuItuPonAlarm_RateRangeConfig_ = config.OnuItuPonAlarm_RateRangeConfig_
+type OnuItuPonAlarm_ValueThresholdConfig_ = config.OnuItuPonAlarm_ValueThresholdConfig_
+
+// OnuItuPonAlarm_SoakTime from public import voltha_protos/ext_config.proto
+type OnuItuPonAlarm_SoakTime = config.OnuItuPonAlarm_SoakTime
+
+// OnuItuPonAlarm_RateThresholdConfig from public import voltha_protos/ext_config.proto
+type OnuItuPonAlarm_RateThresholdConfig = config.OnuItuPonAlarm_RateThresholdConfig
+
+// OnuItuPonAlarm_RateRangeConfig from public import voltha_protos/ext_config.proto
+type OnuItuPonAlarm_RateRangeConfig = config.OnuItuPonAlarm_RateRangeConfig
+
+// OnuItuPonAlarm_ValueThresholdConfig from public import voltha_protos/ext_config.proto
+type OnuItuPonAlarm_ValueThresholdConfig = config.OnuItuPonAlarm_ValueThresholdConfig
+
+// OnuItuPonAlarm_AlarmID from public import voltha_protos/ext_config.proto
+type OnuItuPonAlarm_AlarmID = config.OnuItuPonAlarm_AlarmID
+
+var OnuItuPonAlarm_AlarmID_name = config.OnuItuPonAlarm_AlarmID_name
+var OnuItuPonAlarm_AlarmID_value = config.OnuItuPonAlarm_AlarmID_value
+
+const OnuItuPonAlarm_RDI_ERRORS = OnuItuPonAlarm_AlarmID(config.OnuItuPonAlarm_RDI_ERRORS)
+
+// OnuItuPonAlarm_AlarmReportingCondition from public import voltha_protos/ext_config.proto
+type OnuItuPonAlarm_AlarmReportingCondition = config.OnuItuPonAlarm_AlarmReportingCondition
+
+var OnuItuPonAlarm_AlarmReportingCondition_name = config.OnuItuPonAlarm_AlarmReportingCondition_name
+var OnuItuPonAlarm_AlarmReportingCondition_value = config.OnuItuPonAlarm_AlarmReportingCondition_value
+
+const OnuItuPonAlarm_RATE_THRESHOLD = OnuItuPonAlarm_AlarmReportingCondition(config.OnuItuPonAlarm_RATE_THRESHOLD)
+const OnuItuPonAlarm_RATE_RANGE = OnuItuPonAlarm_AlarmReportingCondition(config.OnuItuPonAlarm_RATE_RANGE)
+const OnuItuPonAlarm_VALUE_THRESHOLD = OnuItuPonAlarm_AlarmReportingCondition(config.OnuItuPonAlarm_VALUE_THRESHOLD)
+
+type GetOnuUniInfoResponse_ConfigurationInd int32
+
+const (
+	GetOnuUniInfoResponse_UNKOWN               GetOnuUniInfoResponse_ConfigurationInd = 0
+	GetOnuUniInfoResponse_TEN_BASE_T_FDX       GetOnuUniInfoResponse_ConfigurationInd = 1
+	GetOnuUniInfoResponse_HUNDRED_BASE_T_FDX   GetOnuUniInfoResponse_ConfigurationInd = 2
+	GetOnuUniInfoResponse_GIGABIT_ETHERNET_FDX GetOnuUniInfoResponse_ConfigurationInd = 3
+	GetOnuUniInfoResponse_TEN_G_ETHERNET_FDX   GetOnuUniInfoResponse_ConfigurationInd = 4
+	GetOnuUniInfoResponse_TEN_BASE_T_HDX       GetOnuUniInfoResponse_ConfigurationInd = 5
+	GetOnuUniInfoResponse_HUNDRED_BASE_T_HDX   GetOnuUniInfoResponse_ConfigurationInd = 6
+	GetOnuUniInfoResponse_GIGABIT_ETHERNET_HDX GetOnuUniInfoResponse_ConfigurationInd = 7
+)
+
+var GetOnuUniInfoResponse_ConfigurationInd_name = map[int32]string{
+	0: "UNKOWN",
+	1: "TEN_BASE_T_FDX",
+	2: "HUNDRED_BASE_T_FDX",
+	3: "GIGABIT_ETHERNET_FDX",
+	4: "TEN_G_ETHERNET_FDX",
+	5: "TEN_BASE_T_HDX",
+	6: "HUNDRED_BASE_T_HDX",
+	7: "GIGABIT_ETHERNET_HDX",
+}
+
+var GetOnuUniInfoResponse_ConfigurationInd_value = map[string]int32{
+	"UNKOWN":               0,
+	"TEN_BASE_T_FDX":       1,
+	"HUNDRED_BASE_T_FDX":   2,
+	"GIGABIT_ETHERNET_FDX": 3,
+	"TEN_G_ETHERNET_FDX":   4,
+	"TEN_BASE_T_HDX":       5,
+	"HUNDRED_BASE_T_HDX":   6,
+	"GIGABIT_ETHERNET_HDX": 7,
+}
+
+func (x GetOnuUniInfoResponse_ConfigurationInd) String() string {
+	return proto.EnumName(GetOnuUniInfoResponse_ConfigurationInd_name, int32(x))
+}
+
+func (GetOnuUniInfoResponse_ConfigurationInd) EnumDescriptor() ([]byte, []int) {
+	return fileDescriptor_7ecf6e9799a9202d, []int{3, 0}
+}
+
+type GetOnuUniInfoResponse_AdministrativeState int32
+
+const (
+	GetOnuUniInfoResponse_ADMSTATE_UNDEFINED GetOnuUniInfoResponse_AdministrativeState = 0
+	GetOnuUniInfoResponse_LOCKED             GetOnuUniInfoResponse_AdministrativeState = 1
+	GetOnuUniInfoResponse_UNLOCKED           GetOnuUniInfoResponse_AdministrativeState = 2
+)
+
+var GetOnuUniInfoResponse_AdministrativeState_name = map[int32]string{
+	0: "ADMSTATE_UNDEFINED",
+	1: "LOCKED",
+	2: "UNLOCKED",
+}
+
+var GetOnuUniInfoResponse_AdministrativeState_value = map[string]int32{
+	"ADMSTATE_UNDEFINED": 0,
+	"LOCKED":             1,
+	"UNLOCKED":           2,
+}
+
+func (x GetOnuUniInfoResponse_AdministrativeState) String() string {
+	return proto.EnumName(GetOnuUniInfoResponse_AdministrativeState_name, int32(x))
+}
+
+func (GetOnuUniInfoResponse_AdministrativeState) EnumDescriptor() ([]byte, []int) {
+	return fileDescriptor_7ecf6e9799a9202d, []int{3, 1}
+}
+
+type GetOnuUniInfoResponse_OperationalState int32
+
+const (
+	GetOnuUniInfoResponse_OPERSTATE_UNDEFINED GetOnuUniInfoResponse_OperationalState = 0
+	GetOnuUniInfoResponse_ENABLED             GetOnuUniInfoResponse_OperationalState = 1
+	GetOnuUniInfoResponse_DISABLED            GetOnuUniInfoResponse_OperationalState = 2
+)
+
+var GetOnuUniInfoResponse_OperationalState_name = map[int32]string{
+	0: "OPERSTATE_UNDEFINED",
+	1: "ENABLED",
+	2: "DISABLED",
+}
+
+var GetOnuUniInfoResponse_OperationalState_value = map[string]int32{
+	"OPERSTATE_UNDEFINED": 0,
+	"ENABLED":             1,
+	"DISABLED":            2,
+}
+
+func (x GetOnuUniInfoResponse_OperationalState) String() string {
+	return proto.EnumName(GetOnuUniInfoResponse_OperationalState_name, int32(x))
+}
+
+func (GetOnuUniInfoResponse_OperationalState) EnumDescriptor() ([]byte, []int) {
+	return fileDescriptor_7ecf6e9799a9202d, []int{3, 2}
+}
+
+type GetValueResponse_Status int32
+
+const (
+	GetValueResponse_STATUS_UNDEFINED GetValueResponse_Status = 0
+	GetValueResponse_OK               GetValueResponse_Status = 1
+	GetValueResponse_ERROR            GetValueResponse_Status = 2
+)
+
+var GetValueResponse_Status_name = map[int32]string{
+	0: "STATUS_UNDEFINED",
+	1: "OK",
+	2: "ERROR",
+}
+
+var GetValueResponse_Status_value = map[string]int32{
+	"STATUS_UNDEFINED": 0,
+	"OK":               1,
+	"ERROR":            2,
+}
+
+func (x GetValueResponse_Status) String() string {
+	return proto.EnumName(GetValueResponse_Status_name, int32(x))
+}
+
+func (GetValueResponse_Status) EnumDescriptor() ([]byte, []int) {
+	return fileDescriptor_7ecf6e9799a9202d, []int{5, 0}
+}
+
+type GetValueResponse_ErrorReason int32
+
+const (
+	GetValueResponse_REASON_UNDEFINED GetValueResponse_ErrorReason = 0
+	GetValueResponse_UNSUPPORTED      GetValueResponse_ErrorReason = 1
+)
+
+var GetValueResponse_ErrorReason_name = map[int32]string{
+	0: "REASON_UNDEFINED",
+	1: "UNSUPPORTED",
+}
+
+var GetValueResponse_ErrorReason_value = map[string]int32{
+	"REASON_UNDEFINED": 0,
+	"UNSUPPORTED":      1,
+}
+
+func (x GetValueResponse_ErrorReason) String() string {
+	return proto.EnumName(GetValueResponse_ErrorReason_name, int32(x))
+}
+
+func (GetValueResponse_ErrorReason) EnumDescriptor() ([]byte, []int) {
+	return fileDescriptor_7ecf6e9799a9202d, []int{5, 1}
+}
+
+type SetValueResponse_Status int32
+
+const (
+	SetValueResponse_STATUS_UNDEFINED SetValueResponse_Status = 0
+	SetValueResponse_OK               SetValueResponse_Status = 1
+	SetValueResponse_ERROR            SetValueResponse_Status = 2
+)
+
+var SetValueResponse_Status_name = map[int32]string{
+	0: "STATUS_UNDEFINED",
+	1: "OK",
+	2: "ERROR",
+}
+
+var SetValueResponse_Status_value = map[string]int32{
+	"STATUS_UNDEFINED": 0,
+	"OK":               1,
+	"ERROR":            2,
+}
+
+func (x SetValueResponse_Status) String() string {
+	return proto.EnumName(SetValueResponse_Status_name, int32(x))
+}
+
+func (SetValueResponse_Status) EnumDescriptor() ([]byte, []int) {
+	return fileDescriptor_7ecf6e9799a9202d, []int{7, 0}
+}
+
+type SetValueResponse_ErrorReason int32
+
+const (
+	SetValueResponse_REASON_UNDEFINED SetValueResponse_ErrorReason = 0
+	SetValueResponse_UNSUPPORTED      SetValueResponse_ErrorReason = 1
+)
+
+var SetValueResponse_ErrorReason_name = map[int32]string{
+	0: "REASON_UNDEFINED",
+	1: "UNSUPPORTED",
+}
+
+var SetValueResponse_ErrorReason_value = map[string]int32{
+	"REASON_UNDEFINED": 0,
+	"UNSUPPORTED":      1,
+}
+
+func (x SetValueResponse_ErrorReason) String() string {
+	return proto.EnumName(SetValueResponse_ErrorReason_name, int32(x))
+}
+
+func (SetValueResponse_ErrorReason) EnumDescriptor() ([]byte, []int) {
+	return fileDescriptor_7ecf6e9799a9202d, []int{7, 1}
+}
+
+type GetDistanceRequest struct {
+	OnuDeviceId          string   `protobuf:"bytes,1,opt,name=onuDeviceId,proto3" json:"onuDeviceId,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *GetDistanceRequest) Reset()         { *m = GetDistanceRequest{} }
+func (m *GetDistanceRequest) String() string { return proto.CompactTextString(m) }
+func (*GetDistanceRequest) ProtoMessage()    {}
+func (*GetDistanceRequest) Descriptor() ([]byte, []int) {
+	return fileDescriptor_7ecf6e9799a9202d, []int{0}
+}
+
+func (m *GetDistanceRequest) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_GetDistanceRequest.Unmarshal(m, b)
+}
+func (m *GetDistanceRequest) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_GetDistanceRequest.Marshal(b, m, deterministic)
+}
+func (m *GetDistanceRequest) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_GetDistanceRequest.Merge(m, src)
+}
+func (m *GetDistanceRequest) XXX_Size() int {
+	return xxx_messageInfo_GetDistanceRequest.Size(m)
+}
+func (m *GetDistanceRequest) XXX_DiscardUnknown() {
+	xxx_messageInfo_GetDistanceRequest.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_GetDistanceRequest proto.InternalMessageInfo
+
+func (m *GetDistanceRequest) GetOnuDeviceId() string {
+	if m != nil {
+		return m.OnuDeviceId
+	}
+	return ""
+}
+
+type GetDistanceResponse struct {
+	Distance             uint32   `protobuf:"varint,1,opt,name=distance,proto3" json:"distance,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *GetDistanceResponse) Reset()         { *m = GetDistanceResponse{} }
+func (m *GetDistanceResponse) String() string { return proto.CompactTextString(m) }
+func (*GetDistanceResponse) ProtoMessage()    {}
+func (*GetDistanceResponse) Descriptor() ([]byte, []int) {
+	return fileDescriptor_7ecf6e9799a9202d, []int{1}
+}
+
+func (m *GetDistanceResponse) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_GetDistanceResponse.Unmarshal(m, b)
+}
+func (m *GetDistanceResponse) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_GetDistanceResponse.Marshal(b, m, deterministic)
+}
+func (m *GetDistanceResponse) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_GetDistanceResponse.Merge(m, src)
+}
+func (m *GetDistanceResponse) XXX_Size() int {
+	return xxx_messageInfo_GetDistanceResponse.Size(m)
+}
+func (m *GetDistanceResponse) XXX_DiscardUnknown() {
+	xxx_messageInfo_GetDistanceResponse.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_GetDistanceResponse proto.InternalMessageInfo
+
+func (m *GetDistanceResponse) GetDistance() uint32 {
+	if m != nil {
+		return m.Distance
+	}
+	return 0
+}
+
+type GetOnuUniInfoRequest struct {
+	UniIndex             uint32   `protobuf:"varint,1,opt,name=uniIndex,proto3" json:"uniIndex,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *GetOnuUniInfoRequest) Reset()         { *m = GetOnuUniInfoRequest{} }
+func (m *GetOnuUniInfoRequest) String() string { return proto.CompactTextString(m) }
+func (*GetOnuUniInfoRequest) ProtoMessage()    {}
+func (*GetOnuUniInfoRequest) Descriptor() ([]byte, []int) {
+	return fileDescriptor_7ecf6e9799a9202d, []int{2}
+}
+
+func (m *GetOnuUniInfoRequest) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_GetOnuUniInfoRequest.Unmarshal(m, b)
+}
+func (m *GetOnuUniInfoRequest) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_GetOnuUniInfoRequest.Marshal(b, m, deterministic)
+}
+func (m *GetOnuUniInfoRequest) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_GetOnuUniInfoRequest.Merge(m, src)
+}
+func (m *GetOnuUniInfoRequest) XXX_Size() int {
+	return xxx_messageInfo_GetOnuUniInfoRequest.Size(m)
+}
+func (m *GetOnuUniInfoRequest) XXX_DiscardUnknown() {
+	xxx_messageInfo_GetOnuUniInfoRequest.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_GetOnuUniInfoRequest proto.InternalMessageInfo
+
+func (m *GetOnuUniInfoRequest) GetUniIndex() uint32 {
+	if m != nil {
+		return m.UniIndex
+	}
+	return 0
+}
+
+type GetOnuUniInfoResponse struct {
+	AdmState             GetOnuUniInfoResponse_AdministrativeState `protobuf:"varint,1,opt,name=admState,proto3,enum=extension.GetOnuUniInfoResponse_AdministrativeState" json:"admState,omitempty"`
+	OperState            GetOnuUniInfoResponse_OperationalState    `protobuf:"varint,2,opt,name=operState,proto3,enum=extension.GetOnuUniInfoResponse_OperationalState" json:"operState,omitempty"`
+	ConfigInd            GetOnuUniInfoResponse_ConfigurationInd    `protobuf:"varint,3,opt,name=configInd,proto3,enum=extension.GetOnuUniInfoResponse_ConfigurationInd" json:"configInd,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                                  `json:"-"`
+	XXX_unrecognized     []byte                                    `json:"-"`
+	XXX_sizecache        int32                                     `json:"-"`
+}
+
+func (m *GetOnuUniInfoResponse) Reset()         { *m = GetOnuUniInfoResponse{} }
+func (m *GetOnuUniInfoResponse) String() string { return proto.CompactTextString(m) }
+func (*GetOnuUniInfoResponse) ProtoMessage()    {}
+func (*GetOnuUniInfoResponse) Descriptor() ([]byte, []int) {
+	return fileDescriptor_7ecf6e9799a9202d, []int{3}
+}
+
+func (m *GetOnuUniInfoResponse) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_GetOnuUniInfoResponse.Unmarshal(m, b)
+}
+func (m *GetOnuUniInfoResponse) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_GetOnuUniInfoResponse.Marshal(b, m, deterministic)
+}
+func (m *GetOnuUniInfoResponse) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_GetOnuUniInfoResponse.Merge(m, src)
+}
+func (m *GetOnuUniInfoResponse) XXX_Size() int {
+	return xxx_messageInfo_GetOnuUniInfoResponse.Size(m)
+}
+func (m *GetOnuUniInfoResponse) XXX_DiscardUnknown() {
+	xxx_messageInfo_GetOnuUniInfoResponse.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_GetOnuUniInfoResponse proto.InternalMessageInfo
+
+func (m *GetOnuUniInfoResponse) GetAdmState() GetOnuUniInfoResponse_AdministrativeState {
+	if m != nil {
+		return m.AdmState
+	}
+	return GetOnuUniInfoResponse_ADMSTATE_UNDEFINED
+}
+
+func (m *GetOnuUniInfoResponse) GetOperState() GetOnuUniInfoResponse_OperationalState {
+	if m != nil {
+		return m.OperState
+	}
+	return GetOnuUniInfoResponse_OPERSTATE_UNDEFINED
+}
+
+func (m *GetOnuUniInfoResponse) GetConfigInd() GetOnuUniInfoResponse_ConfigurationInd {
+	if m != nil {
+		return m.ConfigInd
+	}
+	return GetOnuUniInfoResponse_UNKOWN
+}
+
+type GetValueRequest struct {
+	// Types that are valid to be assigned to Request:
+	//	*GetValueRequest_Distance
+	//	*GetValueRequest_UniInfo
+	Request              isGetValueRequest_Request `protobuf_oneof:"request"`
+	XXX_NoUnkeyedLiteral struct{}                  `json:"-"`
+	XXX_unrecognized     []byte                    `json:"-"`
+	XXX_sizecache        int32                     `json:"-"`
+}
+
+func (m *GetValueRequest) Reset()         { *m = GetValueRequest{} }
+func (m *GetValueRequest) String() string { return proto.CompactTextString(m) }
+func (*GetValueRequest) ProtoMessage()    {}
+func (*GetValueRequest) Descriptor() ([]byte, []int) {
+	return fileDescriptor_7ecf6e9799a9202d, []int{4}
+}
+
+func (m *GetValueRequest) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_GetValueRequest.Unmarshal(m, b)
+}
+func (m *GetValueRequest) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_GetValueRequest.Marshal(b, m, deterministic)
+}
+func (m *GetValueRequest) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_GetValueRequest.Merge(m, src)
+}
+func (m *GetValueRequest) XXX_Size() int {
+	return xxx_messageInfo_GetValueRequest.Size(m)
+}
+func (m *GetValueRequest) XXX_DiscardUnknown() {
+	xxx_messageInfo_GetValueRequest.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_GetValueRequest proto.InternalMessageInfo
+
+type isGetValueRequest_Request interface {
+	isGetValueRequest_Request()
+}
+
+type GetValueRequest_Distance struct {
+	Distance *GetDistanceRequest `protobuf:"bytes,1,opt,name=distance,proto3,oneof"`
+}
+
+type GetValueRequest_UniInfo struct {
+	UniInfo *GetOnuUniInfoRequest `protobuf:"bytes,2,opt,name=uniInfo,proto3,oneof"`
+}
+
+func (*GetValueRequest_Distance) isGetValueRequest_Request() {}
+
+func (*GetValueRequest_UniInfo) isGetValueRequest_Request() {}
+
+func (m *GetValueRequest) GetRequest() isGetValueRequest_Request {
+	if m != nil {
+		return m.Request
+	}
+	return nil
+}
+
+func (m *GetValueRequest) GetDistance() *GetDistanceRequest {
+	if x, ok := m.GetRequest().(*GetValueRequest_Distance); ok {
+		return x.Distance
+	}
+	return nil
+}
+
+func (m *GetValueRequest) GetUniInfo() *GetOnuUniInfoRequest {
+	if x, ok := m.GetRequest().(*GetValueRequest_UniInfo); ok {
+		return x.UniInfo
+	}
+	return nil
+}
+
+// XXX_OneofWrappers is for the internal use of the proto package.
+func (*GetValueRequest) XXX_OneofWrappers() []interface{} {
+	return []interface{}{
+		(*GetValueRequest_Distance)(nil),
+		(*GetValueRequest_UniInfo)(nil),
+	}
+}
+
+type GetValueResponse struct {
+	Status    GetValueResponse_Status      `protobuf:"varint,1,opt,name=status,proto3,enum=extension.GetValueResponse_Status" json:"status,omitempty"`
+	ErrReason GetValueResponse_ErrorReason `protobuf:"varint,2,opt,name=errReason,proto3,enum=extension.GetValueResponse_ErrorReason" json:"errReason,omitempty"`
+	// Types that are valid to be assigned to Response:
+	//	*GetValueResponse_Distance
+	//	*GetValueResponse_UniInfo
+	Response             isGetValueResponse_Response `protobuf_oneof:"response"`
+	XXX_NoUnkeyedLiteral struct{}                    `json:"-"`
+	XXX_unrecognized     []byte                      `json:"-"`
+	XXX_sizecache        int32                       `json:"-"`
+}
+
+func (m *GetValueResponse) Reset()         { *m = GetValueResponse{} }
+func (m *GetValueResponse) String() string { return proto.CompactTextString(m) }
+func (*GetValueResponse) ProtoMessage()    {}
+func (*GetValueResponse) Descriptor() ([]byte, []int) {
+	return fileDescriptor_7ecf6e9799a9202d, []int{5}
+}
+
+func (m *GetValueResponse) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_GetValueResponse.Unmarshal(m, b)
+}
+func (m *GetValueResponse) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_GetValueResponse.Marshal(b, m, deterministic)
+}
+func (m *GetValueResponse) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_GetValueResponse.Merge(m, src)
+}
+func (m *GetValueResponse) XXX_Size() int {
+	return xxx_messageInfo_GetValueResponse.Size(m)
+}
+func (m *GetValueResponse) XXX_DiscardUnknown() {
+	xxx_messageInfo_GetValueResponse.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_GetValueResponse proto.InternalMessageInfo
+
+func (m *GetValueResponse) GetStatus() GetValueResponse_Status {
+	if m != nil {
+		return m.Status
+	}
+	return GetValueResponse_STATUS_UNDEFINED
+}
+
+func (m *GetValueResponse) GetErrReason() GetValueResponse_ErrorReason {
+	if m != nil {
+		return m.ErrReason
+	}
+	return GetValueResponse_REASON_UNDEFINED
+}
+
+type isGetValueResponse_Response interface {
+	isGetValueResponse_Response()
+}
+
+type GetValueResponse_Distance struct {
+	Distance *GetDistanceResponse `protobuf:"bytes,3,opt,name=distance,proto3,oneof"`
+}
+
+type GetValueResponse_UniInfo struct {
+	UniInfo *GetOnuUniInfoResponse `protobuf:"bytes,4,opt,name=uniInfo,proto3,oneof"`
+}
+
+func (*GetValueResponse_Distance) isGetValueResponse_Response() {}
+
+func (*GetValueResponse_UniInfo) isGetValueResponse_Response() {}
+
+func (m *GetValueResponse) GetResponse() isGetValueResponse_Response {
+	if m != nil {
+		return m.Response
+	}
+	return nil
+}
+
+func (m *GetValueResponse) GetDistance() *GetDistanceResponse {
+	if x, ok := m.GetResponse().(*GetValueResponse_Distance); ok {
+		return x.Distance
+	}
+	return nil
+}
+
+func (m *GetValueResponse) GetUniInfo() *GetOnuUniInfoResponse {
+	if x, ok := m.GetResponse().(*GetValueResponse_UniInfo); ok {
+		return x.UniInfo
+	}
+	return nil
+}
+
+// XXX_OneofWrappers is for the internal use of the proto package.
+func (*GetValueResponse) XXX_OneofWrappers() []interface{} {
+	return []interface{}{
+		(*GetValueResponse_Distance)(nil),
+		(*GetValueResponse_UniInfo)(nil),
+	}
+}
+
+type SetValueRequest struct {
+	// Types that are valid to be assigned to Request:
+	//	*SetValueRequest_AlarmConfig
+	Request              isSetValueRequest_Request `protobuf_oneof:"request"`
+	XXX_NoUnkeyedLiteral struct{}                  `json:"-"`
+	XXX_unrecognized     []byte                    `json:"-"`
+	XXX_sizecache        int32                     `json:"-"`
+}
+
+func (m *SetValueRequest) Reset()         { *m = SetValueRequest{} }
+func (m *SetValueRequest) String() string { return proto.CompactTextString(m) }
+func (*SetValueRequest) ProtoMessage()    {}
+func (*SetValueRequest) Descriptor() ([]byte, []int) {
+	return fileDescriptor_7ecf6e9799a9202d, []int{6}
+}
+
+func (m *SetValueRequest) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_SetValueRequest.Unmarshal(m, b)
+}
+func (m *SetValueRequest) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_SetValueRequest.Marshal(b, m, deterministic)
+}
+func (m *SetValueRequest) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_SetValueRequest.Merge(m, src)
+}
+func (m *SetValueRequest) XXX_Size() int {
+	return xxx_messageInfo_SetValueRequest.Size(m)
+}
+func (m *SetValueRequest) XXX_DiscardUnknown() {
+	xxx_messageInfo_SetValueRequest.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_SetValueRequest proto.InternalMessageInfo
+
+type isSetValueRequest_Request interface {
+	isSetValueRequest_Request()
+}
+
+type SetValueRequest_AlarmConfig struct {
+	AlarmConfig *config.AlarmConfig `protobuf:"bytes,1,opt,name=alarm_config,json=alarmConfig,proto3,oneof"`
+}
+
+func (*SetValueRequest_AlarmConfig) isSetValueRequest_Request() {}
+
+func (m *SetValueRequest) GetRequest() isSetValueRequest_Request {
+	if m != nil {
+		return m.Request
+	}
+	return nil
+}
+
+func (m *SetValueRequest) GetAlarmConfig() *config.AlarmConfig {
+	if x, ok := m.GetRequest().(*SetValueRequest_AlarmConfig); ok {
+		return x.AlarmConfig
+	}
+	return nil
+}
+
+// XXX_OneofWrappers is for the internal use of the proto package.
+func (*SetValueRequest) XXX_OneofWrappers() []interface{} {
+	return []interface{}{
+		(*SetValueRequest_AlarmConfig)(nil),
+	}
+}
+
+type SetValueResponse struct {
+	Status               SetValueResponse_Status      `protobuf:"varint,1,opt,name=status,proto3,enum=extension.SetValueResponse_Status" json:"status,omitempty"`
+	ErrReason            SetValueResponse_ErrorReason `protobuf:"varint,2,opt,name=errReason,proto3,enum=extension.SetValueResponse_ErrorReason" json:"errReason,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                     `json:"-"`
+	XXX_unrecognized     []byte                       `json:"-"`
+	XXX_sizecache        int32                        `json:"-"`
+}
+
+func (m *SetValueResponse) Reset()         { *m = SetValueResponse{} }
+func (m *SetValueResponse) String() string { return proto.CompactTextString(m) }
+func (*SetValueResponse) ProtoMessage()    {}
+func (*SetValueResponse) Descriptor() ([]byte, []int) {
+	return fileDescriptor_7ecf6e9799a9202d, []int{7}
+}
+
+func (m *SetValueResponse) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_SetValueResponse.Unmarshal(m, b)
+}
+func (m *SetValueResponse) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_SetValueResponse.Marshal(b, m, deterministic)
+}
+func (m *SetValueResponse) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_SetValueResponse.Merge(m, src)
+}
+func (m *SetValueResponse) XXX_Size() int {
+	return xxx_messageInfo_SetValueResponse.Size(m)
+}
+func (m *SetValueResponse) XXX_DiscardUnknown() {
+	xxx_messageInfo_SetValueResponse.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_SetValueResponse proto.InternalMessageInfo
+
+func (m *SetValueResponse) GetStatus() SetValueResponse_Status {
+	if m != nil {
+		return m.Status
+	}
+	return SetValueResponse_STATUS_UNDEFINED
+}
+
+func (m *SetValueResponse) GetErrReason() SetValueResponse_ErrorReason {
+	if m != nil {
+		return m.ErrReason
+	}
+	return SetValueResponse_REASON_UNDEFINED
+}
+
+type SingleGetValueRequest struct {
+	TargetId             string           `protobuf:"bytes,1,opt,name=targetId,proto3" json:"targetId,omitempty"`
+	Request              *GetValueRequest `protobuf:"bytes,2,opt,name=request,proto3" json:"request,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}         `json:"-"`
+	XXX_unrecognized     []byte           `json:"-"`
+	XXX_sizecache        int32            `json:"-"`
+}
+
+func (m *SingleGetValueRequest) Reset()         { *m = SingleGetValueRequest{} }
+func (m *SingleGetValueRequest) String() string { return proto.CompactTextString(m) }
+func (*SingleGetValueRequest) ProtoMessage()    {}
+func (*SingleGetValueRequest) Descriptor() ([]byte, []int) {
+	return fileDescriptor_7ecf6e9799a9202d, []int{8}
+}
+
+func (m *SingleGetValueRequest) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_SingleGetValueRequest.Unmarshal(m, b)
+}
+func (m *SingleGetValueRequest) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_SingleGetValueRequest.Marshal(b, m, deterministic)
+}
+func (m *SingleGetValueRequest) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_SingleGetValueRequest.Merge(m, src)
+}
+func (m *SingleGetValueRequest) XXX_Size() int {
+	return xxx_messageInfo_SingleGetValueRequest.Size(m)
+}
+func (m *SingleGetValueRequest) XXX_DiscardUnknown() {
+	xxx_messageInfo_SingleGetValueRequest.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_SingleGetValueRequest proto.InternalMessageInfo
+
+func (m *SingleGetValueRequest) GetTargetId() string {
+	if m != nil {
+		return m.TargetId
+	}
+	return ""
+}
+
+func (m *SingleGetValueRequest) GetRequest() *GetValueRequest {
+	if m != nil {
+		return m.Request
+	}
+	return nil
+}
+
+type SingleGetValueResponse struct {
+	Response             *GetValueResponse `protobuf:"bytes,1,opt,name=response,proto3" json:"response,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}          `json:"-"`
+	XXX_unrecognized     []byte            `json:"-"`
+	XXX_sizecache        int32             `json:"-"`
+}
+
+func (m *SingleGetValueResponse) Reset()         { *m = SingleGetValueResponse{} }
+func (m *SingleGetValueResponse) String() string { return proto.CompactTextString(m) }
+func (*SingleGetValueResponse) ProtoMessage()    {}
+func (*SingleGetValueResponse) Descriptor() ([]byte, []int) {
+	return fileDescriptor_7ecf6e9799a9202d, []int{9}
+}
+
+func (m *SingleGetValueResponse) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_SingleGetValueResponse.Unmarshal(m, b)
+}
+func (m *SingleGetValueResponse) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_SingleGetValueResponse.Marshal(b, m, deterministic)
+}
+func (m *SingleGetValueResponse) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_SingleGetValueResponse.Merge(m, src)
+}
+func (m *SingleGetValueResponse) XXX_Size() int {
+	return xxx_messageInfo_SingleGetValueResponse.Size(m)
+}
+func (m *SingleGetValueResponse) XXX_DiscardUnknown() {
+	xxx_messageInfo_SingleGetValueResponse.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_SingleGetValueResponse proto.InternalMessageInfo
+
+func (m *SingleGetValueResponse) GetResponse() *GetValueResponse {
+	if m != nil {
+		return m.Response
+	}
+	return nil
+}
+
+type SingleSetValueRequest struct {
+	TargetId             string           `protobuf:"bytes,1,opt,name=targetId,proto3" json:"targetId,omitempty"`
+	Request              *SetValueRequest `protobuf:"bytes,2,opt,name=request,proto3" json:"request,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}         `json:"-"`
+	XXX_unrecognized     []byte           `json:"-"`
+	XXX_sizecache        int32            `json:"-"`
+}
+
+func (m *SingleSetValueRequest) Reset()         { *m = SingleSetValueRequest{} }
+func (m *SingleSetValueRequest) String() string { return proto.CompactTextString(m) }
+func (*SingleSetValueRequest) ProtoMessage()    {}
+func (*SingleSetValueRequest) Descriptor() ([]byte, []int) {
+	return fileDescriptor_7ecf6e9799a9202d, []int{10}
+}
+
+func (m *SingleSetValueRequest) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_SingleSetValueRequest.Unmarshal(m, b)
+}
+func (m *SingleSetValueRequest) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_SingleSetValueRequest.Marshal(b, m, deterministic)
+}
+func (m *SingleSetValueRequest) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_SingleSetValueRequest.Merge(m, src)
+}
+func (m *SingleSetValueRequest) XXX_Size() int {
+	return xxx_messageInfo_SingleSetValueRequest.Size(m)
+}
+func (m *SingleSetValueRequest) XXX_DiscardUnknown() {
+	xxx_messageInfo_SingleSetValueRequest.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_SingleSetValueRequest proto.InternalMessageInfo
+
+func (m *SingleSetValueRequest) GetTargetId() string {
+	if m != nil {
+		return m.TargetId
+	}
+	return ""
+}
+
+func (m *SingleSetValueRequest) GetRequest() *SetValueRequest {
+	if m != nil {
+		return m.Request
+	}
+	return nil
+}
+
+type SingleSetValueResponse struct {
+	Response             *SetValueResponse `protobuf:"bytes,1,opt,name=response,proto3" json:"response,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}          `json:"-"`
+	XXX_unrecognized     []byte            `json:"-"`
+	XXX_sizecache        int32             `json:"-"`
+}
+
+func (m *SingleSetValueResponse) Reset()         { *m = SingleSetValueResponse{} }
+func (m *SingleSetValueResponse) String() string { return proto.CompactTextString(m) }
+func (*SingleSetValueResponse) ProtoMessage()    {}
+func (*SingleSetValueResponse) Descriptor() ([]byte, []int) {
+	return fileDescriptor_7ecf6e9799a9202d, []int{11}
+}
+
+func (m *SingleSetValueResponse) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_SingleSetValueResponse.Unmarshal(m, b)
+}
+func (m *SingleSetValueResponse) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_SingleSetValueResponse.Marshal(b, m, deterministic)
+}
+func (m *SingleSetValueResponse) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_SingleSetValueResponse.Merge(m, src)
+}
+func (m *SingleSetValueResponse) XXX_Size() int {
+	return xxx_messageInfo_SingleSetValueResponse.Size(m)
+}
+func (m *SingleSetValueResponse) XXX_DiscardUnknown() {
+	xxx_messageInfo_SingleSetValueResponse.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_SingleSetValueResponse proto.InternalMessageInfo
+
+func (m *SingleSetValueResponse) GetResponse() *SetValueResponse {
+	if m != nil {
+		return m.Response
+	}
+	return nil
+}
+
+func init() {
+	proto.RegisterEnum("extension.GetOnuUniInfoResponse_ConfigurationInd", GetOnuUniInfoResponse_ConfigurationInd_name, GetOnuUniInfoResponse_ConfigurationInd_value)
+	proto.RegisterEnum("extension.GetOnuUniInfoResponse_AdministrativeState", GetOnuUniInfoResponse_AdministrativeState_name, GetOnuUniInfoResponse_AdministrativeState_value)
+	proto.RegisterEnum("extension.GetOnuUniInfoResponse_OperationalState", GetOnuUniInfoResponse_OperationalState_name, GetOnuUniInfoResponse_OperationalState_value)
+	proto.RegisterEnum("extension.GetValueResponse_Status", GetValueResponse_Status_name, GetValueResponse_Status_value)
+	proto.RegisterEnum("extension.GetValueResponse_ErrorReason", GetValueResponse_ErrorReason_name, GetValueResponse_ErrorReason_value)
+	proto.RegisterEnum("extension.SetValueResponse_Status", SetValueResponse_Status_name, SetValueResponse_Status_value)
+	proto.RegisterEnum("extension.SetValueResponse_ErrorReason", SetValueResponse_ErrorReason_name, SetValueResponse_ErrorReason_value)
+	proto.RegisterType((*GetDistanceRequest)(nil), "extension.GetDistanceRequest")
+	proto.RegisterType((*GetDistanceResponse)(nil), "extension.GetDistanceResponse")
+	proto.RegisterType((*GetOnuUniInfoRequest)(nil), "extension.GetOnuUniInfoRequest")
+	proto.RegisterType((*GetOnuUniInfoResponse)(nil), "extension.GetOnuUniInfoResponse")
+	proto.RegisterType((*GetValueRequest)(nil), "extension.GetValueRequest")
+	proto.RegisterType((*GetValueResponse)(nil), "extension.GetValueResponse")
+	proto.RegisterType((*SetValueRequest)(nil), "extension.SetValueRequest")
+	proto.RegisterType((*SetValueResponse)(nil), "extension.SetValueResponse")
+	proto.RegisterType((*SingleGetValueRequest)(nil), "extension.SingleGetValueRequest")
+	proto.RegisterType((*SingleGetValueResponse)(nil), "extension.SingleGetValueResponse")
+	proto.RegisterType((*SingleSetValueRequest)(nil), "extension.SingleSetValueRequest")
+	proto.RegisterType((*SingleSetValueResponse)(nil), "extension.SingleSetValueResponse")
+}
+
+func init() { proto.RegisterFile("voltha_protos/extensions.proto", fileDescriptor_7ecf6e9799a9202d) }
+
+var fileDescriptor_7ecf6e9799a9202d = []byte{
+	// 844 bytes of a gzipped FileDescriptorProto
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+	0x56, 0x41, 0xf2, 0x59, 0xff, 0x04, 0x4f, 0xaa, 0x57, 0xe9, 0x81, 0x7f, 0x57, 0x28, 0xad, 0x65,
+	0xfc, 0xec, 0x96, 0xa5, 0x20, 0x85, 0x2d, 0xf2, 0xee, 0xe9, 0x7f, 0xd5, 0x3d, 0xbd, 0xb3, 0x7b,
+	0x7a, 0xbf, 0xee, 0xe9, 0x8d, 0xdd, 0x77, 0xfe, 0x30, 0xa0, 0x85, 0xd7, 0x85, 0x88, 0x80, 0xd9,
+	0x67, 0x12, 0x5f, 0xab, 0x72, 0xb4, 0xb9, 0x93, 0x5b, 0x15, 0x6a, 0x7f, 0x71, 0x4b, 0x85, 0x6e,
+	0x8d, 0x80, 0x49, 0x6f, 0xe5, 0xa4, 0x77, 0x72, 0x56, 0xfb, 0xef, 0x11, 0x78, 0x2a, 0xa2, 0x85,
+	0x23, 0x56, 0x8c, 0xcf, 0x44, 0x34, 0x77, 0xd4, 0xe7, 0x4d, 0x81, 0xfb, 0xe5, 0x74, 0x11, 0xca,
+	0xf7, 0xc9, 0x5b, 0x67, 0x26, 0x2e, 0x4f, 0xd6, 0x55, 0x27, 0xaa, 0xea, 0x6b, 0xfd, 0x11, 0x74,
+	0x75, 0x76, 0xb2, 0x10, 0xc5, 0x57, 0xd3, 0xa8, 0xf6, 0xb6, 0x91, 0x9d, 0x7c, 0xf3, 0x4f, 0x00,
+	0x00, 0x00, 0xff, 0xff, 0xa4, 0x45, 0xe3, 0xcc, 0x59, 0x09, 0x00, 0x00,
+}
+
+// Reference imports to suppress errors if they are not otherwise used.
+var _ context.Context
+var _ grpc.ClientConn
+
+// This is a compile-time assertion to ensure that this generated file
+// is compatible with the grpc package it is being compiled against.
+const _ = grpc.SupportPackageIsVersion4
+
+// ExtensionClient is the client API for Extension service.
+//
+// For semantics around ctx use and closing/ending streaming RPCs, please refer to https://godoc.org/google.golang.org/grpc#ClientConn.NewStream.
+type ExtensionClient interface {
+	// Get a single attribute
+	GetExtValue(ctx context.Context, in *SingleGetValueRequest, opts ...grpc.CallOption) (*SingleGetValueResponse, error)
+	// Set a single attribute
+	SetExtValue(ctx context.Context, in *SingleSetValueRequest, opts ...grpc.CallOption) (*SingleSetValueResponse, error)
+}
+
+type extensionClient struct {
+	cc *grpc.ClientConn
+}
+
+func NewExtensionClient(cc *grpc.ClientConn) ExtensionClient {
+	return &extensionClient{cc}
+}
+
+func (c *extensionClient) GetExtValue(ctx context.Context, in *SingleGetValueRequest, opts ...grpc.CallOption) (*SingleGetValueResponse, error) {
+	out := new(SingleGetValueResponse)
+	err := c.cc.Invoke(ctx, "/extension.Extension/GetExtValue", in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+func (c *extensionClient) SetExtValue(ctx context.Context, in *SingleSetValueRequest, opts ...grpc.CallOption) (*SingleSetValueResponse, error) {
+	out := new(SingleSetValueResponse)
+	err := c.cc.Invoke(ctx, "/extension.Extension/SetExtValue", in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+// ExtensionServer is the server API for Extension service.
+type ExtensionServer interface {
+	// Get a single attribute
+	GetExtValue(context.Context, *SingleGetValueRequest) (*SingleGetValueResponse, error)
+	// Set a single attribute
+	SetExtValue(context.Context, *SingleSetValueRequest) (*SingleSetValueResponse, error)
+}
+
+func RegisterExtensionServer(s *grpc.Server, srv ExtensionServer) {
+	s.RegisterService(&_Extension_serviceDesc, srv)
+}
+
+func _Extension_GetExtValue_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(SingleGetValueRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(ExtensionServer).GetExtValue(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/extension.Extension/GetExtValue",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(ExtensionServer).GetExtValue(ctx, req.(*SingleGetValueRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+func _Extension_SetExtValue_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(SingleSetValueRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(ExtensionServer).SetExtValue(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/extension.Extension/SetExtValue",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(ExtensionServer).SetExtValue(ctx, req.(*SingleSetValueRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+var _Extension_serviceDesc = grpc.ServiceDesc{
+	ServiceName: "extension.Extension",
+	HandlerType: (*ExtensionServer)(nil),
+	Methods: []grpc.MethodDesc{
+		{
+			MethodName: "GetExtValue",
+			Handler:    _Extension_GetExtValue_Handler,
+		},
+		{
+			MethodName: "SetExtValue",
+			Handler:    _Extension_SetExtValue_Handler,
+		},
+	},
+	Streams:  []grpc.StreamDesc{},
+	Metadata: "voltha_protos/extensions.proto",
+}
diff --git a/protos/voltha_protos/extensions.proto b/protos/voltha_protos/extensions.proto
new file mode 100644
index 0000000..4291cfe
--- /dev/null
+++ b/protos/voltha_protos/extensions.proto
@@ -0,0 +1,142 @@
+// 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";
+
+option go_package = "github.com/opencord/voltha-protos/v4/go/extension";
+option java_package = "org.opencord.voltha.extension";
+
+package extension;
+
+import public "voltha_protos/ext_config.proto";
+
+message GetDistanceRequest {
+    string onuDeviceId = 1;
+}
+
+message GetDistanceResponse {
+    uint32 distance = 1; // distance in meters
+}
+
+message GetOnuUniInfoRequest {
+    uint32 uniIndex = 1; // Index of the uni starting from 0
+}
+
+message GetOnuUniInfoResponse {
+    enum ConfigurationInd {
+        UNKOWN = 0;
+        TEN_BASE_T_FDX = 1;
+        HUNDRED_BASE_T_FDX = 2;
+        GIGABIT_ETHERNET_FDX = 3;
+        TEN_G_ETHERNET_FDX = 4;
+        TEN_BASE_T_HDX = 5;
+        HUNDRED_BASE_T_HDX = 6;
+        GIGABIT_ETHERNET_HDX = 7;
+    }
+
+    enum AdministrativeState {
+        ADMSTATE_UNDEFINED = 0;
+        LOCKED = 1;
+        UNLOCKED = 2;
+    }
+
+    enum OperationalState {
+        OPERSTATE_UNDEFINED = 0;
+        ENABLED = 1;
+        DISABLED = 2;
+    }
+
+    AdministrativeState admState = 1;
+    OperationalState operState = 2;
+    ConfigurationInd configInd = 3;
+}
+
+message GetValueRequest {
+    oneof request {
+        GetDistanceRequest distance = 1;
+        GetOnuUniInfoRequest uniInfo = 2;
+    }
+}
+
+message GetValueResponse {
+    enum Status {
+        STATUS_UNDEFINED = 0;
+        OK = 1;
+        ERROR = 2;
+    }
+
+    enum ErrorReason {
+        REASON_UNDEFINED = 0;
+        UNSUPPORTED = 1;
+    }
+    Status status = 1;
+    ErrorReason errReason = 2;
+
+    oneof response {
+        GetDistanceResponse distance = 3;
+        GetOnuUniInfoResponse uniInfo = 4;
+    }
+}
+
+message SetValueRequest {
+    oneof request {
+        config.AlarmConfig alarm_config = 1;
+    }
+}
+
+message SetValueResponse {
+    enum Status {
+        STATUS_UNDEFINED = 0;
+        OK = 1;
+        ERROR = 2;
+    }
+
+    enum ErrorReason {
+        REASON_UNDEFINED = 0;
+        UNSUPPORTED = 1;
+    }
+    Status status = 1;
+    ErrorReason errReason = 2;
+
+    // As of now we don't have any explicit response for the supported SetValueRequests
+    // to be used later
+    //oneof response {
+    //
+    //}
+}
+
+message SingleGetValueRequest {
+    string targetId = 1;
+    GetValueRequest request = 2;
+}
+
+message SingleGetValueResponse{
+    GetValueResponse response = 1;
+}
+
+message SingleSetValueRequest {
+    string targetId = 1;
+    SetValueRequest request = 2;
+}
+message SingleSetValueResponse {
+    SetValueResponse response = 1;
+}
+
+// Extension is a service to get and set specific attributes
+service Extension {
+    // Get a single attribute
+    rpc GetExtValue(SingleGetValueRequest) returns (SingleGetValueResponse);
+    // Set a single attribute
+    rpc SetExtValue(SingleSetValueRequest) returns (SingleSetValueResponse);
+}
diff --git a/voltha.pb b/voltha.pb
index b1f7883..9d0f96d 100644
--- a/voltha.pb
+++ b/voltha.pb
Binary files differ