diff --git a/graffiti/websocket/structmessage.pb.go b/graffiti/websocket/structmessage.pb.go
new file mode 100644
index 0000000000000000000000000000000000000000..faa18fde4136c0a9bca2dbab4ab2a9fbce71efd8
--- /dev/null
+++ b/graffiti/websocket/structmessage.pb.go
@@ -0,0 +1,580 @@
+// Code generated by protoc-gen-gogo. DO NOT EDIT.
+// source: graffiti/websocket/structmessage.proto
+
+package websocket
+
+import (
+	fmt "fmt"
+	_ "github.com/gogo/protobuf/gogoproto"
+	proto "github.com/gogo/protobuf/proto"
+	io "io"
+	math "math"
+	math_bits "math/bits"
+)
+
+// 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.GoGoProtoPackageIsVersion3 // please upgrade the proto package
+
+type Format int32
+
+const (
+	Format_Json     Format = 0
+	Format_Protobuf Format = 1
+)
+
+var Format_name = map[int32]string{
+	0: "Json",
+	1: "Protobuf",
+}
+
+var Format_value = map[string]int32{
+	"Json":     0,
+	"Protobuf": 1,
+}
+
+func (x Format) String() string {
+	return proto.EnumName(Format_name, int32(x))
+}
+
+func (Format) EnumDescriptor() ([]byte, []int) {
+	return fileDescriptor_8e9639977d76961c, []int{0}
+}
+
+// StructMessage is a Protobuf based message on top of Message.
+// It implements Message interface and can be sent with via a Speaker.
+type StructMessage struct {
+	XXX_state structMessageState `json:"-"`
+	Namespace string             `protobuf:"bytes,1,opt,name=Namespace,proto3" json:"Namespace,omitempty"`
+	Type      string             `protobuf:"bytes,2,opt,name=Type,proto3" json:"Type,omitempty"`
+	UUID      string             `protobuf:"bytes,3,opt,name=UUID,proto3" json:"UUID,omitempty"`
+	Status    int64              `protobuf:"varint,4,opt,name=Status,proto3" json:"Status,omitempty"`
+	Format    Format             `protobuf:"varint,5,opt,name=Format,proto3,enum=websocket.Format" json:"Format,omitempty"`
+	Obj       []byte             `protobuf:"bytes,6,opt,name=Obj,proto3" json:"Obj,omitempty"`
+}
+
+func (m *StructMessage) Reset()         { *m = StructMessage{} }
+func (m *StructMessage) String() string { return proto.CompactTextString(m) }
+func (*StructMessage) ProtoMessage()    {}
+func (*StructMessage) Descriptor() ([]byte, []int) {
+	return fileDescriptor_8e9639977d76961c, []int{0}
+}
+func (m *StructMessage) XXX_Unmarshal(b []byte) error {
+	return m.Unmarshal(b)
+}
+func (m *StructMessage) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	if deterministic {
+		return xxx_messageInfo_StructMessage.Marshal(b, m, deterministic)
+	} else {
+		b = b[:cap(b)]
+		n, err := m.MarshalToSizedBuffer(b)
+		if err != nil {
+			return nil, err
+		}
+		return b[:n], nil
+	}
+}
+func (m *StructMessage) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_StructMessage.Merge(m, src)
+}
+func (m *StructMessage) XXX_Size() int {
+	return m.ProtoSize()
+}
+func (m *StructMessage) XXX_DiscardUnknown() {
+	xxx_messageInfo_StructMessage.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_StructMessage proto.InternalMessageInfo
+
+func (m *StructMessage) GetNamespace() string {
+	if m != nil {
+		return m.Namespace
+	}
+	return ""
+}
+
+func (m *StructMessage) GetType() string {
+	if m != nil {
+		return m.Type
+	}
+	return ""
+}
+
+func (m *StructMessage) GetUUID() string {
+	if m != nil {
+		return m.UUID
+	}
+	return ""
+}
+
+func (m *StructMessage) GetStatus() int64 {
+	if m != nil {
+		return m.Status
+	}
+	return 0
+}
+
+func (m *StructMessage) GetFormat() Format {
+	if m != nil {
+		return m.Format
+	}
+	return Format_Json
+}
+
+func (m *StructMessage) GetObj() []byte {
+	if m != nil {
+		return m.Obj
+	}
+	return nil
+}
+
+func init() {
+	proto.RegisterEnum("websocket.Format", Format_name, Format_value)
+	proto.RegisterType((*StructMessage)(nil), "websocket.StructMessage")
+}
+
+func init() {
+	proto.RegisterFile("graffiti/websocket/structmessage.proto", fileDescriptor_8e9639977d76961c)
+}
+
+var fileDescriptor_8e9639977d76961c = []byte{
+	// 297 bytes of a gzipped FileDescriptorProto
+	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0xe2, 0x52, 0x4b, 0x2f, 0x4a, 0x4c,
+	0x4b, 0xcb, 0x2c, 0xc9, 0xd4, 0x2f, 0x4f, 0x4d, 0x2a, 0xce, 0x4f, 0xce, 0x4e, 0x2d, 0xd1, 0x2f,
+	0x2e, 0x29, 0x2a, 0x4d, 0x2e, 0xc9, 0x4d, 0x2d, 0x2e, 0x4e, 0x4c, 0x4f, 0xd5, 0x2b, 0x28, 0xca,
+	0x2f, 0xc9, 0x17, 0xe2, 0x84, 0x4b, 0x4b, 0x89, 0xa4, 0xe7, 0xa7, 0xe7, 0x83, 0x45, 0xf5, 0x41,
+	0x2c, 0x88, 0x02, 0xa5, 0x55, 0x8c, 0x5c, 0xbc, 0xc1, 0x60, 0x8d, 0xbe, 0x10, 0x8d, 0x42, 0x32,
+	0x5c, 0x9c, 0x7e, 0x89, 0xb9, 0xa9, 0xc5, 0x05, 0x89, 0xc9, 0xa9, 0x12, 0x8c, 0x0a, 0x8c, 0x1a,
+	0x9c, 0x41, 0x08, 0x01, 0x21, 0x21, 0x2e, 0x96, 0x90, 0xca, 0x82, 0x54, 0x09, 0x26, 0xb0, 0x04,
+	0x98, 0x0d, 0x12, 0x0b, 0x0d, 0xf5, 0x74, 0x91, 0x60, 0x86, 0x88, 0x81, 0xd8, 0x42, 0x62, 0x5c,
+	0x6c, 0xc1, 0x25, 0x89, 0x25, 0xa5, 0xc5, 0x12, 0x2c, 0x0a, 0x8c, 0x1a, 0xcc, 0x41, 0x50, 0x9e,
+	0x90, 0x26, 0x17, 0x9b, 0x5b, 0x7e, 0x51, 0x6e, 0x62, 0x89, 0x04, 0xab, 0x02, 0xa3, 0x06, 0x9f,
+	0x91, 0xa0, 0x1e, 0xdc, 0x85, 0x7a, 0x10, 0x89, 0x20, 0xa8, 0x02, 0x21, 0x01, 0x2e, 0x66, 0xff,
+	0xa4, 0x2c, 0x09, 0x36, 0x05, 0x46, 0x0d, 0x9e, 0x20, 0x10, 0x53, 0x4b, 0x01, 0xa6, 0x59, 0x88,
+	0x83, 0x8b, 0xc5, 0xab, 0x38, 0x3f, 0x4f, 0x80, 0x41, 0x88, 0x87, 0x8b, 0x23, 0x00, 0xe4, 0x93,
+	0xa4, 0xd2, 0x34, 0x01, 0x46, 0xa7, 0xe0, 0x13, 0x8f, 0xe4, 0x18, 0x2f, 0x3c, 0x92, 0x63, 0x7c,
+	0xf0, 0x48, 0x8e, 0x61, 0xc2, 0x63, 0x39, 0x86, 0x05, 0x8f, 0xe5, 0x18, 0x2f, 0x3c, 0x96, 0x63,
+	0xb8, 0xf1, 0x58, 0x8e, 0x21, 0xca, 0x34, 0x3d, 0xb3, 0x24, 0xa3, 0x34, 0x49, 0x2f, 0x39, 0x3f,
+	0x57, 0xbf, 0x38, 0xbb, 0x32, 0x25, 0xb3, 0x2c, 0x55, 0xb7, 0xa0, 0x28, 0x3f, 0x2b, 0x35, 0xb9,
+	0x04, 0xc6, 0xd7, 0xc7, 0x0c, 0xd8, 0x24, 0x36, 0x70, 0x50, 0x19, 0x03, 0x02, 0x00, 0x00, 0xff,
+	0xff, 0x36, 0xfa, 0x0c, 0xd5, 0x75, 0x01, 0x00, 0x00,
+}
+
+func (m *StructMessage) Marshal() (dAtA []byte, err error) {
+	size := m.ProtoSize()
+	dAtA = make([]byte, size)
+	n, err := m.MarshalToSizedBuffer(dAtA[:size])
+	if err != nil {
+		return nil, err
+	}
+	return dAtA[:n], nil
+}
+
+func (m *StructMessage) MarshalTo(dAtA []byte) (int, error) {
+	size := m.ProtoSize()
+	return m.MarshalToSizedBuffer(dAtA[:size])
+}
+
+func (m *StructMessage) MarshalToSizedBuffer(dAtA []byte) (int, error) {
+	i := len(dAtA)
+	_ = i
+	var l int
+	_ = l
+	if len(m.Obj) > 0 {
+		i -= len(m.Obj)
+		copy(dAtA[i:], m.Obj)
+		i = encodeVarintStructmessage(dAtA, i, uint64(len(m.Obj)))
+		i--
+		dAtA[i] = 0x32
+	}
+	if m.Format != 0 {
+		i = encodeVarintStructmessage(dAtA, i, uint64(m.Format))
+		i--
+		dAtA[i] = 0x28
+	}
+	if m.Status != 0 {
+		i = encodeVarintStructmessage(dAtA, i, uint64(m.Status))
+		i--
+		dAtA[i] = 0x20
+	}
+	if len(m.UUID) > 0 {
+		i -= len(m.UUID)
+		copy(dAtA[i:], m.UUID)
+		i = encodeVarintStructmessage(dAtA, i, uint64(len(m.UUID)))
+		i--
+		dAtA[i] = 0x1a
+	}
+	if len(m.Type) > 0 {
+		i -= len(m.Type)
+		copy(dAtA[i:], m.Type)
+		i = encodeVarintStructmessage(dAtA, i, uint64(len(m.Type)))
+		i--
+		dAtA[i] = 0x12
+	}
+	if len(m.Namespace) > 0 {
+		i -= len(m.Namespace)
+		copy(dAtA[i:], m.Namespace)
+		i = encodeVarintStructmessage(dAtA, i, uint64(len(m.Namespace)))
+		i--
+		dAtA[i] = 0xa
+	}
+	return len(dAtA) - i, nil
+}
+
+func encodeVarintStructmessage(dAtA []byte, offset int, v uint64) int {
+	offset -= sovStructmessage(v)
+	base := offset
+	for v >= 1<<7 {
+		dAtA[offset] = uint8(v&0x7f | 0x80)
+		v >>= 7
+		offset++
+	}
+	dAtA[offset] = uint8(v)
+	return base
+}
+func (m *StructMessage) ProtoSize() (n int) {
+	if m == nil {
+		return 0
+	}
+	var l int
+	_ = l
+	l = len(m.Namespace)
+	if l > 0 {
+		n += 1 + l + sovStructmessage(uint64(l))
+	}
+	l = len(m.Type)
+	if l > 0 {
+		n += 1 + l + sovStructmessage(uint64(l))
+	}
+	l = len(m.UUID)
+	if l > 0 {
+		n += 1 + l + sovStructmessage(uint64(l))
+	}
+	if m.Status != 0 {
+		n += 1 + sovStructmessage(uint64(m.Status))
+	}
+	if m.Format != 0 {
+		n += 1 + sovStructmessage(uint64(m.Format))
+	}
+	l = len(m.Obj)
+	if l > 0 {
+		n += 1 + l + sovStructmessage(uint64(l))
+	}
+	return n
+}
+
+func sovStructmessage(x uint64) (n int) {
+	return (math_bits.Len64(x|1) + 6) / 7
+}
+func sozStructmessage(x uint64) (n int) {
+	return sovStructmessage(uint64((x << 1) ^ uint64((int64(x) >> 63))))
+}
+func (m *StructMessage) Unmarshal(dAtA []byte) error {
+	l := len(dAtA)
+	iNdEx := 0
+	for iNdEx < l {
+		preIndex := iNdEx
+		var wire uint64
+		for shift := uint(0); ; shift += 7 {
+			if shift >= 64 {
+				return ErrIntOverflowStructmessage
+			}
+			if iNdEx >= l {
+				return io.ErrUnexpectedEOF
+			}
+			b := dAtA[iNdEx]
+			iNdEx++
+			wire |= uint64(b&0x7F) << shift
+			if b < 0x80 {
+				break
+			}
+		}
+		fieldNum := int32(wire >> 3)
+		wireType := int(wire & 0x7)
+		if wireType == 4 {
+			return fmt.Errorf("proto: StructMessage: wiretype end group for non-group")
+		}
+		if fieldNum <= 0 {
+			return fmt.Errorf("proto: StructMessage: illegal tag %d (wire type %d)", fieldNum, wire)
+		}
+		switch fieldNum {
+		case 1:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Namespace", wireType)
+			}
+			var stringLen uint64
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowStructmessage
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				stringLen |= uint64(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			intStringLen := int(stringLen)
+			if intStringLen < 0 {
+				return ErrInvalidLengthStructmessage
+			}
+			postIndex := iNdEx + intStringLen
+			if postIndex < 0 {
+				return ErrInvalidLengthStructmessage
+			}
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			m.Namespace = string(dAtA[iNdEx:postIndex])
+			iNdEx = postIndex
+		case 2:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Type", wireType)
+			}
+			var stringLen uint64
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowStructmessage
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				stringLen |= uint64(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			intStringLen := int(stringLen)
+			if intStringLen < 0 {
+				return ErrInvalidLengthStructmessage
+			}
+			postIndex := iNdEx + intStringLen
+			if postIndex < 0 {
+				return ErrInvalidLengthStructmessage
+			}
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			m.Type = string(dAtA[iNdEx:postIndex])
+			iNdEx = postIndex
+		case 3:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field UUID", wireType)
+			}
+			var stringLen uint64
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowStructmessage
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				stringLen |= uint64(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			intStringLen := int(stringLen)
+			if intStringLen < 0 {
+				return ErrInvalidLengthStructmessage
+			}
+			postIndex := iNdEx + intStringLen
+			if postIndex < 0 {
+				return ErrInvalidLengthStructmessage
+			}
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			m.UUID = string(dAtA[iNdEx:postIndex])
+			iNdEx = postIndex
+		case 4:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Status", wireType)
+			}
+			m.Status = 0
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowStructmessage
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				m.Status |= int64(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+		case 5:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Format", wireType)
+			}
+			m.Format = 0
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowStructmessage
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				m.Format |= Format(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+		case 6:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Obj", wireType)
+			}
+			var byteLen int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowStructmessage
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				byteLen |= int(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			if byteLen < 0 {
+				return ErrInvalidLengthStructmessage
+			}
+			postIndex := iNdEx + byteLen
+			if postIndex < 0 {
+				return ErrInvalidLengthStructmessage
+			}
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			m.Obj = append(m.Obj[:0], dAtA[iNdEx:postIndex]...)
+			if m.Obj == nil {
+				m.Obj = []byte{}
+			}
+			iNdEx = postIndex
+		default:
+			iNdEx = preIndex
+			skippy, err := skipStructmessage(dAtA[iNdEx:])
+			if err != nil {
+				return err
+			}
+			if (skippy < 0) || (iNdEx+skippy) < 0 {
+				return ErrInvalidLengthStructmessage
+			}
+			if (iNdEx + skippy) > l {
+				return io.ErrUnexpectedEOF
+			}
+			iNdEx += skippy
+		}
+	}
+
+	if iNdEx > l {
+		return io.ErrUnexpectedEOF
+	}
+	return nil
+}
+func skipStructmessage(dAtA []byte) (n int, err error) {
+	l := len(dAtA)
+	iNdEx := 0
+	depth := 0
+	for iNdEx < l {
+		var wire uint64
+		for shift := uint(0); ; shift += 7 {
+			if shift >= 64 {
+				return 0, ErrIntOverflowStructmessage
+			}
+			if iNdEx >= l {
+				return 0, io.ErrUnexpectedEOF
+			}
+			b := dAtA[iNdEx]
+			iNdEx++
+			wire |= (uint64(b) & 0x7F) << shift
+			if b < 0x80 {
+				break
+			}
+		}
+		wireType := int(wire & 0x7)
+		switch wireType {
+		case 0:
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return 0, ErrIntOverflowStructmessage
+				}
+				if iNdEx >= l {
+					return 0, io.ErrUnexpectedEOF
+				}
+				iNdEx++
+				if dAtA[iNdEx-1] < 0x80 {
+					break
+				}
+			}
+		case 1:
+			iNdEx += 8
+		case 2:
+			var length int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return 0, ErrIntOverflowStructmessage
+				}
+				if iNdEx >= l {
+					return 0, io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				length |= (int(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			if length < 0 {
+				return 0, ErrInvalidLengthStructmessage
+			}
+			iNdEx += length
+		case 3:
+			depth++
+		case 4:
+			if depth == 0 {
+				return 0, ErrUnexpectedEndOfGroupStructmessage
+			}
+			depth--
+		case 5:
+			iNdEx += 4
+		default:
+			return 0, fmt.Errorf("proto: illegal wireType %d", wireType)
+		}
+		if iNdEx < 0 {
+			return 0, ErrInvalidLengthStructmessage
+		}
+		if depth == 0 {
+			return iNdEx, nil
+		}
+	}
+	return 0, io.ErrUnexpectedEOF
+}
+
+var (
+	ErrInvalidLengthStructmessage        = fmt.Errorf("proto: negative length found during unmarshaling")
+	ErrIntOverflowStructmessage          = fmt.Errorf("proto: integer overflow")
+	ErrUnexpectedEndOfGroupStructmessage = fmt.Errorf("proto: unexpected end of group")
+)
diff --git a/graffiti/websocket/structmessage.proto b/graffiti/websocket/structmessage.proto
new file mode 100644
index 0000000000000000000000000000000000000000..f3e56e6927e3c9585369280787d3cb1c2b7e8d38
--- /dev/null
+++ b/graffiti/websocket/structmessage.proto
@@ -0,0 +1,25 @@
+syntax = "proto3";
+
+package websocket;
+
+import "gogoproto/gogo.proto";
+
+option go_package = "github.com/skydive-project/skydive/graffiti/websocket";
+option (gogoproto.protosizer_all) = true;
+option (gogoproto.sizer_all) = false;
+
+enum Format {
+  Json = 0;
+  Protobuf = 1;
+}
+
+// StructMessage is a Protobuf based message on top of Message.
+// It implements Message interface and can be sent with via a Speaker.
+message StructMessage {
+  string Namespace = 1;
+  string Type = 2;
+  string UUID = 3;
+  int64 Status = 4;
+  Format Format = 5;
+  bytes Obj = 6;
+}