diff --git a/README.md b/README.md
index cc73a88..239ef17 100755
--- a/README.md
+++ b/README.md
@@ -40,6 +40,7 @@ module.exports = {
   port: 1080,
   servers: [{
     enabled: true,
+    transport: 'tcp',
     host: "bs.example.com",
     port: 6858,
     key: "j+b3)I<h#c1_Jl^c",
diff --git a/docs/config/README.md b/docs/config/README.md
index bc3b286..a38e811 100644
--- a/docs/config/README.md
+++ b/docs/config/README.md
@@ -2,7 +2,7 @@
 
 ## Template
 
-You can use blinksocks init to generate `blinksocks.client.js` and `blinksocks.server.js`:
+You can use **blinksocks init** to generate `blinksocks.client.js` and `blinksocks.server.js`:
 
 ```
 $ blinksocks init
@@ -14,10 +14,8 @@ $ blinksocks init
 module.exports = {
 
   // local hostname or ip address
-  //
-  // @note
-  //   1. For client, act as a Socks5/Socks4/HTTP server.
-  //   2. For server, act as a blinksocks server.
+  // For client, act as a Socks5/Socks4/HTTP server.
+  // For server, act as a blinksocks server.
   host: "localhost",
 
   // local port to be listen on
@@ -29,6 +27,9 @@ module.exports = {
       // allow to use this server or not
       enabled: true,
 
+      // the transport layer, "tcp" or "udp"
+      transport: 'tcp',
+
       // server host name or ip address
       host: "example.com",
 
@@ -36,13 +37,11 @@ module.exports = {
       port: 5678,
 
       // a secret key for encryption/description
-      key: "j+b3)I<h#c1_Jl^c",
+      key: "qtPb2edK7yd7e]<K",
 
       // presets to process data stream
-      //
-      // @note
-      //   1. DO NOT modify the first preset if you don't know what it is.
-      //   2. Take care the order of those presets, read the docs before changing them.
+      // DO NOT modify the first preset if you don't know what it is.
+      // Take care the order of those presets, read the docs before changing them.
       presets: [
         {
           // preset name
@@ -71,10 +70,7 @@ module.exports = {
   // hot-reload when this file changed
   watch: true,
 
-  // log at the level
-  //
-  // @note
-  //   1. should be one of [error, warn, info, verbose, debug, silly]
+  // log at the level, "error", "warn", "info", "verbose", "debug" or "silly"
   log_level: "info"
 
 };
@@ -86,23 +82,22 @@ module.exports = {
 module.exports = {
 
   // local hostname or ip address
-  //
-  // @note
-  //   1. For client, act as a Socks5/Socks4/HTTP server.
-  //   2. For server, act as a blinksocks server.
+  // For client, act as a Socks5/Socks4/HTTP server.
+  // For server, act as a blinksocks server.
   host: "0.0.0.0",
 
   // local port to be listen on
   port: 5678,
 
+  // the transport layer, "tcp" or "udp"
+  transport: 'tcp',
+
   // a secret key for encryption/description
-  key: "j+b3)I<h#c1_Jl^c",
+  key: "qtPb2edK7yd7e]<K",
 
   // presets to process data stream
-  //
-  // @note
-  //   1. DO NOT modify the first preset if you don't know what it is.
-  //   2. Take care the order of those presets, read the docs before changing them.
+  // DO NOT modify the first preset if you don't know what it is.
+  // Take care the order of those presets, read the docs before changing them.
   presets: [
     {
       // preset name
@@ -120,10 +115,8 @@ module.exports = {
     }
   ],
 
-  // redirect data stream to here once preset fail to process(server side only)
-  //
-  // @note
-  //   1. Should be formed with "host:port".
+  // redirect data to here once preset fail to process(server side only)
+  // Should be formed with "host:port".
   redirect: "",
 
   // close inactive connection after timeout seconds
@@ -135,10 +128,7 @@ module.exports = {
   // hot-reload when this file changed
   watch: true,
 
-  // log at the level
-  //
-  // @note
-  //   1. should be one of [error, warn, info, verbose, debug, silly]
+  // log at the level, "error", "warn", "info", "verbose", "debug" or "silly"
   log_level: "info"
 
 };
diff --git a/docs/development/architecture/README.md b/docs/development/architecture/README.md
index 23acb49..9fd2803 100755
--- a/docs/development/architecture/README.md
+++ b/docs/development/architecture/README.md
@@ -91,6 +91,8 @@ Store target address for further use:
 
 ```js
 // presets/ss-base.js
+import {IPreset} from './defs';
+
 export default class SSBasePreset extends IPreset {
 
   _atyp = ATYP_V4;
@@ -121,49 +123,52 @@ there are several built-in presets already.
 
 ### Custom Preset
 
-A typical preset must implement four methods of IPreset interface:
+A typical preset should extends **IPreset** interface:
 
 ```js
 // custom.js
+import {IPreset} from './defs';
+
 export default class CustomPreset extends IPreset {
 
-  clientOut({buffer/* , next, broadcast, fail */}) {
+  clientOut({buffer/* , next, broadcast, direct, fail */}) {
     // next(buffer); async
     return buffer; // sync
   }
 
-  serverIn({buffer/* , next, broadcast, fail */}) {
+  serverIn({buffer/* , next, broadcast, direct, fail */}) {
     return buffer;
   }
 
-  serverOut({buffer/* , next, broadcast, fail */}) {
+  serverOut({buffer/* , next, broadcast, direct, fail */}) {
     return buffer;
   }
 
-  clientIn({buffer/* , next, broadcast, fail */}) {
+  clientIn({buffer/* , next, broadcast, direct, fail */}) {
     return buffer;
   }
 
 }
 ```
 
-| METHODS   | DESCRIPTION                          |
-| :-------- | :----------------------------------- |
-| clientOut | client will send data to server      |
-| serverIn  | server received data from client     |
-| serverOut | server will send back data to client |
-| clientIn  | client received data from server     |
+| METHODS   | DESCRIPTION                                                                      |
+| :-------- | :------------------------------------------------------------------------------- |
+| clientOut | client received data from application, and ready to forward data to server       |
+| serverIn  | server received data from client, and ready to forward data to real destination  |
+| serverOut | server received data from real destination, and ready to backward data to client |
+| clientIn  | client received data from server, and ready to backward data to application      |
 
 > NOTE: `server*` are used on the server side while `client*` are used on the client side.
 
 Every method gets an object which contains three parameters you need:
 
-| PARAM     | DESCRIPTION                                                                |
-| :-------- | :------------------------------------------------------------------------- |
-| buffer    | output from the previous middleware                                        |
-| next      | call it with a new buffer once **async** process done                      |
-| broadcast | call it with an action to notify other middlewares                         |
-| fail      | call it once handshake failed, connection will be closed in random seconds |
+| PARAM                     | DESCRIPTION                                                                |
+| :------------------------ | :------------------------------------------------------------------------- |
+| buffer                    | output from the previous preset                                            |
+| next(buffer)              | asynchronously process buffer to the next preset                           |
+| broadcast(action)         | broadcast an action to other middlewares                                   |
+| direct(buffer, isReverse) | ignore the following presets, send data directly to fsocket or bsocket     |
+| fail(message)             | report that the preset is fail to process                                  |
 
 ### Presets Decoupling
 
@@ -175,7 +180,7 @@ Action is a plain object which only requires a `type` field:
 // action
 {
   type: <string>,
-  payload: <any>
+  ...
 }
 ```
 
@@ -183,6 +188,8 @@ Once broadcast, **all** other middlewares will receive the action in **onNotifie
 
 ```js
 // custom.js
+import {IPreset} from './defs';
+
 export default class CustomPreset extends IPreset {
 
   /**
@@ -206,13 +213,15 @@ There are two hooks available:
 
 ```js
 // custom.js
+import {IPreset} from './defs';
+
 export default class CustomPreset extends IPreset {
 
-  beforeOut({buffer/* , next, broadcast, fail */}) {
+  beforeOut({buffer/* , next, broadcast, direct, fail */}) {
     return buffer;
   }
 
-  beforeIn({buffer/* , next, broadcast, fail */}) {
+  beforeIn({buffer/* , next, broadcast, direct, fail */}) {
     return buffer;
   }
 
@@ -231,6 +240,8 @@ export default class CustomPreset extends IPreset {
 You can access user configuration from your preset:
 
 ```js
+import {IPreset} from './defs';
+
 export default class CustomPreset extends IPreset {
   
   constructor() {