diff --git a/proxy/vless/encoding/addons.go b/proxy/vless/encoding/addons.go
index 1bf1817d..374c45d1 100644
--- a/proxy/vless/encoding/addons.go
+++ b/proxy/vless/encoding/addons.go
@@ -13,8 +13,7 @@ import (
 )
 
 func EncodeHeaderAddons(buffer *buf.Buffer, addons *Addons) error {
-	switch addons.Flow {
-	case vless.XRV:
+	if addons.Flow == vless.XRV || len(addons.Seed) > 0 {
 		bytes, err := proto.Marshal(addons)
 		if err != nil {
 			return errors.New("failed to marshal addons protobuf value").Base(err)
@@ -25,12 +24,11 @@ func EncodeHeaderAddons(buffer *buf.Buffer, addons *Addons) error {
 		if _, err := buffer.Write(bytes); err != nil {
 			return errors.New("failed to write addons protobuf value").Base(err)
 		}
-	default:
+	} else {
 		if err := buffer.WriteByte(0); err != nil {
 			return errors.New("failed to write addons protobuf length").Base(err)
 		}
 	}
-
 	return nil
 }
 
@@ -50,11 +48,6 @@ func DecodeHeaderAddons(buffer *buf.Buffer, reader io.Reader) (*Addons, error) {
 		if err := proto.Unmarshal(buffer.Bytes(), addons); err != nil {
 			return nil, errors.New("failed to unmarshal addons protobuf value").Base(err)
 		}
-
-		// Verification.
-		switch addons.Flow {
-		default:
-		}
 	}
 
 	return addons, nil
@@ -74,11 +67,8 @@ func EncodeBodyAddons(writer io.Writer, request *protocol.RequestHeader, request
 
 // DecodeBodyAddons returns a Reader from which caller can fetch decrypted body.
 func DecodeBodyAddons(reader io.Reader, request *protocol.RequestHeader, addons *Addons) buf.Reader {
-	switch addons.Flow {
-	default:
-		if request.Command == protocol.RequestCommandUDP {
-			return NewLengthPacketReader(reader)
-		}
+	if request.Command == protocol.RequestCommandUDP {
+		return NewLengthPacketReader(reader)
 	}
 	return buf.NewReader(reader)
 }
diff --git a/proxy/vless/encoding/addons.pb.go b/proxy/vless/encoding/addons.pb.go
index 2f518841..94cce4ef 100644
--- a/proxy/vless/encoding/addons.pb.go
+++ b/proxy/vless/encoding/addons.pb.go
@@ -20,13 +20,70 @@ const (
 	_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
 )
 
+type SeedMode int32
+
+const (
+	SeedMode_Unknown              SeedMode = 0
+	SeedMode_PaddingOnly          SeedMode = 1
+	SeedMode_PaddingPlusDelay     SeedMode = 2
+	SeedMode_IndependentScheduler SeedMode = 3
+)
+
+// Enum value maps for SeedMode.
+var (
+	SeedMode_name = map[int32]string{
+		0: "Unknown",
+		1: "PaddingOnly",
+		2: "PaddingPlusDelay",
+		3: "IndependentScheduler",
+	}
+	SeedMode_value = map[string]int32{
+		"Unknown":              0,
+		"PaddingOnly":          1,
+		"PaddingPlusDelay":     2,
+		"IndependentScheduler": 3,
+	}
+)
+
+func (x SeedMode) Enum() *SeedMode {
+	p := new(SeedMode)
+	*p = x
+	return p
+}
+
+func (x SeedMode) String() string {
+	return protoimpl.X.EnumStringOf(x.Descriptor(), protoreflect.EnumNumber(x))
+}
+
+func (SeedMode) Descriptor() protoreflect.EnumDescriptor {
+	return file_proxy_vless_encoding_addons_proto_enumTypes[0].Descriptor()
+}
+
+func (SeedMode) Type() protoreflect.EnumType {
+	return &file_proxy_vless_encoding_addons_proto_enumTypes[0]
+}
+
+func (x SeedMode) Number() protoreflect.EnumNumber {
+	return protoreflect.EnumNumber(x)
+}
+
+// Deprecated: Use SeedMode.Descriptor instead.
+func (SeedMode) EnumDescriptor() ([]byte, []int) {
+	return file_proxy_vless_encoding_addons_proto_rawDescGZIP(), []int{0}
+}
+
 type Addons struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Flow string `protobuf:"bytes,1,opt,name=Flow,proto3" json:"Flow,omitempty"`
-	Seed []byte `protobuf:"bytes,2,opt,name=Seed,proto3" json:"Seed,omitempty"`
+	Flow            string           `protobuf:"bytes,1,opt,name=Flow,proto3" json:"Flow,omitempty"`
+	Seed            []byte           `protobuf:"bytes,2,opt,name=Seed,proto3" json:"Seed,omitempty"`
+	Mode            SeedMode         `protobuf:"varint,3,opt,name=Mode,proto3,enum=xray.proxy.vless.encoding.SeedMode" json:"Mode,omitempty"`
+	Duration        string           `protobuf:"bytes,4,opt,name=Duration,proto3" json:"Duration,omitempty"` // "0-8" means apply to number of packets, "1kb-" means start applying once both side exchange 1kb data, counting two-ways
+	Padding         *PaddingConfig   `protobuf:"bytes,5,opt,name=Padding,proto3" json:"Padding,omitempty"`
+	Delay           *DelayConfig     `protobuf:"bytes,6,opt,name=Delay,proto3" json:"Delay,omitempty"`
+	SchedulerConfig *SchedulerConfig `protobuf:"bytes,7,opt,name=SchedulerConfig,proto3" json:"SchedulerConfig,omitempty"`
 }
 
 func (x *Addons) Reset() {
@@ -73,24 +130,283 @@ func (x *Addons) GetSeed() []byte {
 	return nil
 }
 
+func (x *Addons) GetMode() SeedMode {
+	if x != nil {
+		return x.Mode
+	}
+	return SeedMode_Unknown
+}
+
+func (x *Addons) GetDuration() string {
+	if x != nil {
+		return x.Duration
+	}
+	return ""
+}
+
+func (x *Addons) GetPadding() *PaddingConfig {
+	if x != nil {
+		return x.Padding
+	}
+	return nil
+}
+
+func (x *Addons) GetDelay() *DelayConfig {
+	if x != nil {
+		return x.Delay
+	}
+	return nil
+}
+
+func (x *Addons) GetSchedulerConfig() *SchedulerConfig {
+	if x != nil {
+		return x.SchedulerConfig
+	}
+	return nil
+}
+
+type PaddingConfig struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	RegularMin uint32 `protobuf:"varint,1,opt,name=RegularMin,proto3" json:"RegularMin,omitempty"`
+	RegularMax uint32 `protobuf:"varint,2,opt,name=RegularMax,proto3" json:"RegularMax,omitempty"`
+	LongMin    uint32 `protobuf:"varint,3,opt,name=LongMin,proto3" json:"LongMin,omitempty"`
+	LongMax    uint32 `protobuf:"varint,4,opt,name=LongMax,proto3" json:"LongMax,omitempty"`
+}
+
+func (x *PaddingConfig) Reset() {
+	*x = PaddingConfig{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_proxy_vless_encoding_addons_proto_msgTypes[1]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *PaddingConfig) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*PaddingConfig) ProtoMessage() {}
+
+func (x *PaddingConfig) ProtoReflect() protoreflect.Message {
+	mi := &file_proxy_vless_encoding_addons_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 PaddingConfig.ProtoReflect.Descriptor instead.
+func (*PaddingConfig) Descriptor() ([]byte, []int) {
+	return file_proxy_vless_encoding_addons_proto_rawDescGZIP(), []int{1}
+}
+
+func (x *PaddingConfig) GetRegularMin() uint32 {
+	if x != nil {
+		return x.RegularMin
+	}
+	return 0
+}
+
+func (x *PaddingConfig) GetRegularMax() uint32 {
+	if x != nil {
+		return x.RegularMax
+	}
+	return 0
+}
+
+func (x *PaddingConfig) GetLongMin() uint32 {
+	if x != nil {
+		return x.LongMin
+	}
+	return 0
+}
+
+func (x *PaddingConfig) GetLongMax() uint32 {
+	if x != nil {
+		return x.LongMax
+	}
+	return 0
+}
+
+type DelayConfig struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	IsRandom  bool   `protobuf:"varint,1,opt,name=IsRandom,proto3" json:"IsRandom,omitempty"`
+	MinMillis uint32 `protobuf:"varint,2,opt,name=MinMillis,proto3" json:"MinMillis,omitempty"`
+	MaxMillis uint32 `protobuf:"varint,3,opt,name=MaxMillis,proto3" json:"MaxMillis,omitempty"`
+}
+
+func (x *DelayConfig) Reset() {
+	*x = DelayConfig{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_proxy_vless_encoding_addons_proto_msgTypes[2]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *DelayConfig) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*DelayConfig) ProtoMessage() {}
+
+func (x *DelayConfig) ProtoReflect() protoreflect.Message {
+	mi := &file_proxy_vless_encoding_addons_proto_msgTypes[2]
+	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 DelayConfig.ProtoReflect.Descriptor instead.
+func (*DelayConfig) Descriptor() ([]byte, []int) {
+	return file_proxy_vless_encoding_addons_proto_rawDescGZIP(), []int{2}
+}
+
+func (x *DelayConfig) GetIsRandom() bool {
+	if x != nil {
+		return x.IsRandom
+	}
+	return false
+}
+
+func (x *DelayConfig) GetMinMillis() uint32 {
+	if x != nil {
+		return x.MinMillis
+	}
+	return 0
+}
+
+func (x *DelayConfig) GetMaxMillis() uint32 {
+	if x != nil {
+		return x.MaxMillis
+	}
+	return 0
+}
+
+type SchedulerConfig struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	TimeoutMillis uint32 `protobuf:"varint,1,opt,name=TimeoutMillis,proto3" json:"TimeoutMillis,omitempty"` // original traffic will not be sent right away but when scheduler want to send or pending buffer times out
+}
+
+func (x *SchedulerConfig) Reset() {
+	*x = SchedulerConfig{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_proxy_vless_encoding_addons_proto_msgTypes[3]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *SchedulerConfig) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*SchedulerConfig) ProtoMessage() {}
+
+func (x *SchedulerConfig) ProtoReflect() protoreflect.Message {
+	mi := &file_proxy_vless_encoding_addons_proto_msgTypes[3]
+	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 SchedulerConfig.ProtoReflect.Descriptor instead.
+func (*SchedulerConfig) Descriptor() ([]byte, []int) {
+	return file_proxy_vless_encoding_addons_proto_rawDescGZIP(), []int{3}
+}
+
+func (x *SchedulerConfig) GetTimeoutMillis() uint32 {
+	if x != nil {
+		return x.TimeoutMillis
+	}
+	return 0
+}
+
 var File_proxy_vless_encoding_addons_proto protoreflect.FileDescriptor
 
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+	0x01, 0x20, 0x01, 0x28, 0x0d, 0x52, 0x0d, 0x54, 0x69, 0x6d, 0x65, 0x6f, 0x75, 0x74, 0x4d, 0x69,
+	0x6c, 0x6c, 0x69, 0x73, 0x2a, 0x58, 0x0a, 0x08, 0x53, 0x65, 0x65, 0x64, 0x4d, 0x6f, 0x64, 0x65,
+	0x12, 0x0b, 0x0a, 0x07, 0x55, 0x6e, 0x6b, 0x6e, 0x6f, 0x77, 0x6e, 0x10, 0x00, 0x12, 0x0f, 0x0a,
+	0x0b, 0x50, 0x61, 0x64, 0x64, 0x69, 0x6e, 0x67, 0x4f, 0x6e, 0x6c, 0x79, 0x10, 0x01, 0x12, 0x14,
+	0x0a, 0x10, 0x50, 0x61, 0x64, 0x64, 0x69, 0x6e, 0x67, 0x50, 0x6c, 0x75, 0x73, 0x44, 0x65, 0x6c,
+	0x61, 0x79, 0x10, 0x02, 0x12, 0x18, 0x0a, 0x14, 0x49, 0x6e, 0x64, 0x65, 0x70, 0x65, 0x6e, 0x64,
+	0x65, 0x6e, 0x74, 0x53, 0x63, 0x68, 0x65, 0x64, 0x75, 0x6c, 0x65, 0x72, 0x10, 0x03, 0x42, 0x6d,
+	0x0a, 0x1d, 0x63, 0x6f, 0x6d, 0x2e, 0x78, 0x72, 0x61, 0x79, 0x2e, 0x70, 0x72, 0x6f, 0x78, 0x79,
+	0x2e, 0x76, 0x6c, 0x65, 0x73, 0x73, 0x2e, 0x65, 0x6e, 0x63, 0x6f, 0x64, 0x69, 0x6e, 0x67, 0x50,
+	0x01, 0x5a, 0x2e, 0x67, 0x69, 0x74, 0x68, 0x75, 0x62, 0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x78, 0x74,
+	0x6c, 0x73, 0x2f, 0x78, 0x72, 0x61, 0x79, 0x2d, 0x63, 0x6f, 0x72, 0x65, 0x2f, 0x70, 0x72, 0x6f,
+	0x78, 0x79, 0x2f, 0x76, 0x6c, 0x65, 0x73, 0x73, 0x2f, 0x65, 0x6e, 0x63, 0x6f, 0x64, 0x69, 0x6e,
+	0x67, 0xaa, 0x02, 0x19, 0x58, 0x72, 0x61, 0x79, 0x2e, 0x50, 0x72, 0x6f, 0x78, 0x79, 0x2e, 0x56,
+	0x6c, 0x65, 0x73, 0x73, 0x2e, 0x45, 0x6e, 0x63, 0x6f, 0x64, 0x69, 0x6e, 0x67, 0x62, 0x06, 0x70,
+	0x72, 0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (
@@ -105,16 +421,25 @@ func file_proxy_vless_encoding_addons_proto_rawDescGZIP() []byte {
 	return file_proxy_vless_encoding_addons_proto_rawDescData
 }
 
-var file_proxy_vless_encoding_addons_proto_msgTypes = make([]protoimpl.MessageInfo, 1)
-var file_proxy_vless_encoding_addons_proto_goTypes = []any{
-	(*Addons)(nil), // 0: xray.proxy.vless.encoding.Addons
+var file_proxy_vless_encoding_addons_proto_enumTypes = make([]protoimpl.EnumInfo, 1)
+var file_proxy_vless_encoding_addons_proto_msgTypes = make([]protoimpl.MessageInfo, 4)
+var file_proxy_vless_encoding_addons_proto_goTypes = []interface{}{
+	(SeedMode)(0),           // 0: xray.proxy.vless.encoding.SeedMode
+	(*Addons)(nil),          // 1: xray.proxy.vless.encoding.Addons
+	(*PaddingConfig)(nil),   // 2: xray.proxy.vless.encoding.PaddingConfig
+	(*DelayConfig)(nil),     // 3: xray.proxy.vless.encoding.DelayConfig
+	(*SchedulerConfig)(nil), // 4: xray.proxy.vless.encoding.SchedulerConfig
 }
 var file_proxy_vless_encoding_addons_proto_depIdxs = []int32{
-	0, // [0:0] is the sub-list for method output_type
-	0, // [0:0] is the sub-list for method input_type
-	0, // [0:0] is the sub-list for extension type_name
-	0, // [0:0] is the sub-list for extension extendee
-	0, // [0:0] is the sub-list for field type_name
+	0, // 0: xray.proxy.vless.encoding.Addons.Mode:type_name -> xray.proxy.vless.encoding.SeedMode
+	2, // 1: xray.proxy.vless.encoding.Addons.Padding:type_name -> xray.proxy.vless.encoding.PaddingConfig
+	3, // 2: xray.proxy.vless.encoding.Addons.Delay:type_name -> xray.proxy.vless.encoding.DelayConfig
+	4, // 3: xray.proxy.vless.encoding.Addons.SchedulerConfig:type_name -> xray.proxy.vless.encoding.SchedulerConfig
+	4, // [4:4] is the sub-list for method output_type
+	4, // [4:4] is the sub-list for method input_type
+	4, // [4:4] is the sub-list for extension type_name
+	4, // [4:4] is the sub-list for extension extendee
+	0, // [0:4] is the sub-list for field type_name
 }
 
 func init() { file_proxy_vless_encoding_addons_proto_init() }
@@ -122,18 +447,69 @@ func file_proxy_vless_encoding_addons_proto_init() {
 	if File_proxy_vless_encoding_addons_proto != nil {
 		return
 	}
+	if !protoimpl.UnsafeEnabled {
+		file_proxy_vless_encoding_addons_proto_msgTypes[0].Exporter = func(v any, i int) any {
+			switch v := v.(*Addons); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_proxy_vless_encoding_addons_proto_msgTypes[1].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*PaddingConfig); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_proxy_vless_encoding_addons_proto_msgTypes[2].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*DelayConfig); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_proxy_vless_encoding_addons_proto_msgTypes[3].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*SchedulerConfig); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+	}
 	type x struct{}
 	out := protoimpl.TypeBuilder{
 		File: protoimpl.DescBuilder{
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_proxy_vless_encoding_addons_proto_rawDesc,
-			NumEnums:      0,
-			NumMessages:   1,
+			NumEnums:      1,
+			NumMessages:   4,
 			NumExtensions: 0,
 			NumServices:   0,
 		},
 		GoTypes:           file_proxy_vless_encoding_addons_proto_goTypes,
 		DependencyIndexes: file_proxy_vless_encoding_addons_proto_depIdxs,
+		EnumInfos:         file_proxy_vless_encoding_addons_proto_enumTypes,
 		MessageInfos:      file_proxy_vless_encoding_addons_proto_msgTypes,
 	}.Build()
 	File_proxy_vless_encoding_addons_proto = out.File
diff --git a/proxy/vless/encoding/addons.proto b/proxy/vless/encoding/addons.proto
index 3730e87f..4a7d12f1 100644
--- a/proxy/vless/encoding/addons.proto
+++ b/proxy/vless/encoding/addons.proto
@@ -9,4 +9,34 @@ option java_multiple_files = true;
 message Addons {
   string Flow = 1;
   bytes Seed = 2;
+  SeedMode Mode = 3;
+  string Duration = 4;  // "0-8" means apply to number of packets, "1kb-" means start applying once both side exchange 1kb data, counting two-ways
+  PaddingConfig Padding = 5;
+  DelayConfig Delay = 6;
+  SchedulerConfig SchedulerConfig = 7;
+}
+
+enum SeedMode {
+  Unknown = 0;
+  PaddingOnly = 1;
+  PaddingPlusDelay = 2;
+  IndependentScheduler = 3;
+}
+
+message PaddingConfig {
+  uint32 RegularMin = 1;
+  uint32 RegularMax = 2;
+  uint32 LongMin = 3;
+  uint32 LongMax = 4;
+}
+
+message DelayConfig {
+  bool IsRandom = 1;
+  uint32 MinMillis = 2;
+  uint32 MaxMillis = 3;
+}
+
+message SchedulerConfig {
+  uint32 TimeoutMillis = 1; // original traffic will not be sent right away but when scheduler want to send or pending buffer times out
+  // Other TBD  
 }