diff --git a/build.gradle b/build.gradle
index 7ab059651..ce4dfd3b8 100644
--- a/build.gradle
+++ b/build.gradle
@@ -19,6 +19,7 @@ allprojects {
     version = "1.0"
 
     repositories {
+        jcenter()//klock
         google()
         maven { url "https://mirrors.huaweicloud.com/repository/maven/" }
     }
diff --git a/dependencies.gradle b/dependencies.gradle
index a36a8788c..225a24ea6 100644
--- a/dependencies.gradle
+++ b/dependencies.gradle
@@ -30,4 +30,5 @@ ext {
     kotlinxIOJS = "org.jetbrains.kotlinx:kotlinx-io-js:$kotlinx_io_version"
     kotlinxIONative = "org.jetbrains.kotlinx:kotlinx-io-native:$kotlinx_io_version"
 
+    klock = "com.soywiz.korlibs.klock:klock:1.7.0"
 }
diff --git a/mirai-core/build.gradle b/mirai-core/build.gradle
index da83aab15..e0d3dbd42 100644
--- a/mirai-core/build.gradle
+++ b/mirai-core/build.gradle
@@ -35,6 +35,7 @@ kotlin {
                 implementation rootProject.ext.atomicFUCommon
 
                 implementation rootProject.ext.kotlinxIOCommon
+                implementation rootProject.ext.klock
             }
         }
 
@@ -51,6 +52,7 @@ kotlin {
                 implementation 'org.yaml:snakeyaml:1.18'
                 implementation 'org.jsoup:jsoup:1.12.1'
                 implementation 'org.ini4j:ini4j:0.5.2'
+                implementation rootProject.ext.klock
             }
         }
 
diff --git a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/BotHelper.kt b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/BotHelper.kt
index 11205f135..582393ff5 100644
--- a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/BotHelper.kt
+++ b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/BotHelper.kt
@@ -14,8 +14,6 @@ import net.mamoe.mirai.utils.toUHexString
 
 /**
  * The mirror of functions in inner classes of [Bot]
- *
- * @author Him188moe
  */
 
 //Contacts
diff --git a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/TIMBotNetworkHandler.kt b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/TIMBotNetworkHandler.kt
index ffd657bf8..51fee80f9 100644
--- a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/TIMBotNetworkHandler.kt
+++ b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/TIMBotNetworkHandler.kt
@@ -147,7 +147,7 @@ internal class TIMBotNetworkHandler internal constructor(private val bot: Bot) :
             val expect = expectPacket<ServerTouchResponsePacket>()
             NetworkScope.launch { processReceive() }
             NetworkScope.launch {
-                if (withTimeoutOrNull(configuration.touchTimeoutMillis) { expect.join() } == null) {
+                if (withTimeoutOrNull(configuration.touchTimeout.millisecondsLong) { expect.join() } == null) {
                     loginResult.complete(LoginResult.TIMEOUT)
                 }
             }
@@ -342,7 +342,7 @@ internal class TIMBotNetworkHandler internal constructor(private val bot: Bot) :
                     this.token00BA = packet.token00BA
                     this.captchaCache = packet.captchaPart1
 
-                    if (packet.unknownBoolean == true) {
+                    if (packet.unknownBoolean) {
                         this.captchaSectionId = 1
                         socket.sendPacket(ClientCaptchaTransmissionRequestPacket(bot.qqAccount, this.token0825, this.captchaSectionId++, packet.token00BA))
                     }
@@ -403,11 +403,11 @@ internal class TIMBotNetworkHandler internal constructor(private val bot: Bot) :
 
                     heartbeatJob = NetworkScope.launch {
                         while (socket.isOpen) {
-                            delay(configuration.heartbeatPeriodMillis)
+                            delay(configuration.heartbeatPeriod.millisecondsLong)
                             with(session) {
                                 class HeartbeatTimeoutException : CancellationException("heartbeat timeout")
 
-                                if (withTimeoutOrNull(configuration.heartbeatTimeoutMillis) {
+                                if (withTimeoutOrNull(configuration.heartbeatTimeout.millisecondsLong) {
                                             ClientHeartbeatPacket(bot.qqAccount, sessionKey).sendAndExpect<ServerHeartbeatResponsePacket> {}
                                         } == null) {
                                     bot.logPurple("Heartbeat timed out")
diff --git a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/TIMProtocol.kt b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/TIMProtocol.kt
index 3562b4446..70c81be15 100644
--- a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/TIMProtocol.kt
+++ b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/TIMProtocol.kt
@@ -20,7 +20,7 @@ object TIMProtocol {
         ).forEach { list.add(solveIpAddress(it)) }
 
         list.toList()
-    }()
+    }()//不使用lazy是为了在启动时就加载.
 
     const val head = "02"
     const val ver = "37 13"
@@ -36,6 +36,9 @@ object TIMProtocol {
     const val constantData1 = "00 18 00 16 00 01 "
     const val constantData2 = "00 00 04 53 00 00 00 01 00 00 15 85 "
 
+
+    //todo 使用 byte array
+
     /**
      * Touch 发出时写入, 并用于加密, 接受 sendTouch response 时解密.
      */
diff --git a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/packet/login/PasswordSubmission.kt b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/packet/login/PasswordSubmission.kt
index 48ac3478a..1dc9e3618 100644
--- a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/packet/login/PasswordSubmission.kt
+++ b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/packet/login/PasswordSubmission.kt
@@ -22,22 +22,23 @@ class ClientPasswordSubmissionPacket constructor(
         private val loginIP: String,
         private val privateKey: ByteArray,
         private val token0825: ByteArray,
-        private val token00BA: ByteArray? = null,//
+        private val token00BA: ByteArray? = null,
         private val randomDeviceName: Boolean = false,
         private val tlv0006: IoBuffer? = null
 ) : ClientPacket() {
     override fun encode(builder: BytePacketBuilder) = with(builder) {
-        this.writeQQ(bot)
-        this.writeHex(TIMProtocol.passwordSubmissionTLV1)
+        writeQQ(bot)
+        writeHex(TIMProtocol.passwordSubmissionTLV1)
 
-        this.writeShort(25)
-        this.writeHex(TIMProtocol.publicKey)//25
+        writeShort(25)
+        writeHex(TIMProtocol.publicKey)//=25
 
-        this.writeHex("00 00 00 10")//=16
-        this.writeHex(TIMProtocol.key0836)//16
+        writeZero(2)
+        writeShort(16)
+        writeHex(TIMProtocol.key0836)//=16
 
         //TODO shareKey 极大可能为 publicKey, key0836 计算得到
-        this.encryptAndWrite(TIMProtocol.shareKey.hexToBytes()) {
+        encryptAndWrite(TIMProtocol.shareKey) {
             writePart1(bot, password, loginTime, loginIP, privateKey, token0825, randomDeviceName, tlv0006)
 
             if (token00BA != null) {
diff --git a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/packet/login/ServerLoginResponse.kt b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/packet/login/ServerLoginResponse.kt
index 0c00c9e9c..2bc547ba3 100644
--- a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/packet/login/ServerLoginResponse.kt
+++ b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/packet/login/ServerLoginResponse.kt
@@ -127,7 +127,7 @@ class ServerLoginResponseCaptchaInitPacket(input: ByteReadPacket) : ServerLoginR
 
     lateinit var captchaPart1: IoBuffer
     lateinit var token00BA: ByteArray
-    var unknownBoolean: Boolean? = null
+    var unknownBoolean: Boolean by Delegates.notNull()
 
 
     @Tested
diff --git a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/utils/BotNetworkConfiguration.kt b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/utils/BotNetworkConfiguration.kt
index 6647b03da..bed1e0c5a 100644
--- a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/utils/BotNetworkConfiguration.kt
+++ b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/utils/BotNetworkConfiguration.kt
@@ -1,5 +1,7 @@
 package net.mamoe.mirai.utils
 
+import com.soywiz.klock.TimeSpan
+import com.soywiz.klock.seconds
 import net.mamoe.mirai.network.protocol.tim.packet.login.ServerTouchResponsePacket
 
 /**
@@ -9,7 +11,7 @@ class BotNetworkConfiguration {
     /**
      * 等待 [ServerTouchResponsePacket] 的时间
      */
-    var touchTimeoutMillis: Long = 2000
+    var touchTimeout: TimeSpan = 2.seconds
 
     /**
      * 是否使用随机的设备名.
@@ -21,13 +23,13 @@ class BotNetworkConfiguration {
     /**
      * 心跳周期. 过长会导致被服务器断开连接.
      */
-    var heartbeatPeriodMillis: Long = 1 * 60 * 1000
+    var heartbeatPeriod: TimeSpan = 60.seconds
 
     /**
      * 每次心跳时等待结果的时间.
      * 一旦心跳超时, 整个网络服务将会重启 (将消耗约 1s). 除正在进行的任务 (如图片上传) 会被中断外, 事件和插件均不受影响.
      */
-    var heartbeatTimeoutMillis: Long = 2000
+    var heartbeatTimeout: TimeSpan = 2.seconds
 
     companion object {
         val Default = BotNetworkConfiguration()
diff --git a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/utils/PlatformUtils.kt b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/utils/PlatformUtils.kt
index f8a558c4d..18d781312 100644
--- a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/utils/PlatformUtils.kt
+++ b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/utils/PlatformUtils.kt
@@ -1,9 +1,11 @@
 package net.mamoe.mirai.utils
 
+import com.soywiz.klock.DateTime
+
 /**
  * 时间戳
  */
-expect val currentTime: Long
+val currentTime: Long = DateTime.nowUnixLong()
 
 /**
  * 设备名
diff --git a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/utils/TypeConvertion.kt b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/utils/TypeConvertion.kt
index 437ba2080..d69c2fafc 100644
--- a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/utils/TypeConvertion.kt
+++ b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/utils/TypeConvertion.kt
@@ -41,13 +41,22 @@ fun UInt.toByteArray(): ByteArray = byteArrayOf(
 fun Int.toUHexString(separator: String = " "): String = this.toByteArray().toUHexString(separator)
 fun Byte.toUHexString(): String = this.toUByte().toString(16).toUpperCase()
 fun String.hexToBytes(): ByteArray = HexCache.hexToBytes(this)
+
+/**
+ * 将 Hex 转为 UByteArray, 有根据 hex 的 [hashCode] 建立的缓存.
+ */
 fun String.hexToUBytes(): UByteArray = HexCache.hexToUBytes(this)
+
 fun String.hexToInt(): Int = hexToBytes().toUInt().toInt()
 fun getRandomByteArray(length: Int): ByteArray = ByteArray(length) { Random.nextInt(0..255).toByte() }
 fun ByteArray.toUInt(): UInt = this[0].toUInt().and(255u).shl(24) + this[1].toUInt().and(255u).shl(16) + this[2].toUInt().and(255u).shl(8) + this[3].toUInt().and(255u).shl(0)
 
 fun ByteArray.toIoBuffer(): IoBuffer = IoBuffer.Pool.borrow().let { it.writeFully(this); it }
 
+/**
+ * Hex 转换 [ByteArray] 和 [UByteArray] 缓存.
+ * 为 [net.mamoe.mirai.network.protocol.tim.TIMProtocol] 的 hex 常量使用
+ */
 internal object HexCache {
     private val hexToByteArrayCacheMap: MutableMap<Int, ByteArray> = mutableMapOf()
 
diff --git a/mirai-core/src/jvmMain/kotlin/net/mamoe/mirai/utils/PlatformUtilsJvm.kt b/mirai-core/src/jvmMain/kotlin/net/mamoe/mirai/utils/PlatformUtilsJvm.kt
index eaecd582f..d92ad1bb4 100644
--- a/mirai-core/src/jvmMain/kotlin/net/mamoe/mirai/utils/PlatformUtilsJvm.kt
+++ b/mirai-core/src/jvmMain/kotlin/net/mamoe/mirai/utils/PlatformUtilsJvm.kt
@@ -8,8 +8,6 @@ import java.net.InetAddress
 import java.security.MessageDigest
 import java.util.zip.CRC32
 
-actual val currentTime: Long = System.currentTimeMillis()
-
 actual val deviceName: String = InetAddress.getLocalHost().hostName
 
 
diff --git a/mirai-debug/build.gradle b/mirai-debug/build.gradle
index 1e8346a2b..4a6ab6d66 100644
--- a/mirai-debug/build.gradle
+++ b/mirai-debug/build.gradle
@@ -5,9 +5,9 @@ dependencies {
     implementation project(':mirai-core')
     compile files('./lib/jpcap.jar')
 
-    compile rootProject.ext.coroutineCommon
-    compile rootProject.ext.kotlinJvm
-    compile rootProject.ext.kotlinxIOJvm
+    implementation rootProject.ext.coroutineCommon
+    implementation rootProject.ext.kotlinJvm
+    implementation rootProject.ext.kotlinxIOJvm
 }
 
 tasks.withType(JavaCompile) {
diff --git a/mirai-debug/src/main/java/PacketDebuger.kt b/mirai-debug/src/main/java/PacketDebuger.kt
index 6e5788137..0f24c41da 100644
--- a/mirai-debug/src/main/java/PacketDebuger.kt
+++ b/mirai-debug/src/main/java/PacketDebuger.kt
@@ -23,32 +23,11 @@ object Main {
 
     @JvmStatic
     fun main(args: Array<String>) {
-        /*--------------	第一步绑定网络设备       --------------*/
         val devices = JpcapCaptor.getDeviceList()
-
-        /*
-        \Device\NPF_{0E7103E4-BF96-4B66-A23B-F6F630D814CD}     |     Microsoft
-        \Device\NPF_{2CCA31E2-93D5-42F2-92C1-5882E18A8E95}     |     VMware Virtual Ethernet Adapter
-        \Device\NPF_{A12C8971-858B-4BC8-816C-4077E1636AC5}     |     VMware Virtual Ethernet Adapter
-        \Device\NPF_{231C4E27-AF20-4362-BCA3-107236CB8A2E}     |     MS NDIS 6.0 LoopBack Driver
-        \Device\NPF_{500B5537-AA10-4E2F-8F7D-E6BD365BDCD1}     |     Microsoft
-        \Device\NPF_{A177317B-903A-45B5-8AEA-3698E423ABD6}     |     Microsoft
-         */
-        /*
-        for (n in devices) {
-            println(n.name + "     |     " + n.description)
-        }
-        println("-------------------------------------------")
-        exitProcess(0)*/
-
         val jpcap: JpcapCaptor?
         val caplen = 4096
         val promiscCheck = true
-
         jpcap = JpcapCaptor.openDevice(devices[0], caplen, promiscCheck, 50)
-
-
-        /*----------第二步抓包-----------------*/
         while (true) {
             assert(jpcap != null)
             val pk = jpcap!!.packet
@@ -60,7 +39,11 @@ object Main {
                     }
 
                     if (localIp in pk.dst_ip.hostAddress) {//接受
-                        dataReceived(pk.data)
+                        try {
+                            dataReceived(pk.data)
+                        } catch (e: Exception) {
+                            e.printStackTrace()
+                        }
                     } else {
                         try {
                             dataSent(pk.data)
@@ -88,7 +71,7 @@ object Main {
      * 6. 运行到 `mov eax,dword ptr ss:[ebp+10]`
      * 7. 查看内存, 从 `eax` 开始的 16 bytes 便是 `sessionKey`
      */
-    val sessionKey: ByteArray = "F1 68 24 ED A8 6D 33 6E 5C B7 E0 F4 45 77 21 04".hexToBytes()
+    val sessionKey: ByteArray = "99 91 B9 8B 79 45 FD CF 51 4A B9 DE 14 61 ED E3".hexToBytes()
 
     fun dataReceived(data: ByteArray) {
         println("--------------")
diff --git a/mirai-demos/mirai-demo-1/src/main/java/demo1/Main.kt b/mirai-demos/mirai-demo-1/src/main/java/demo1/Main.kt
index ba38e899b..fbf785fca 100644
--- a/mirai-demos/mirai-demo-1/src/main/java/demo1/Main.kt
+++ b/mirai-demos/mirai-demo-1/src/main/java/demo1/Main.kt
@@ -24,7 +24,6 @@ suspend fun main() {
     ), Console())
 
     bot.login {
-        touchTimeoutMillis = 2000
         randomDeviceName = true
     }.let {
         if (it != LoginResult.SUCCESS) {
diff --git a/settings.gradle b/settings.gradle
index 30681eac6..540e4a00f 100644
--- a/settings.gradle
+++ b/settings.gradle
@@ -5,4 +5,6 @@ include(':mirai-api')
 include(':mirai-demos:mirai-demo-1')
 include(':mirai-demos')
 include(':mirai-debug')
-project(':mirai-demos:mirai-demo-1').projectDir = file('mirai-demos/mirai-demo-1')
\ No newline at end of file
+project(':mirai-demos:mirai-demo-1').projectDir = file('mirai-demos/mirai-demo-1')
+
+enableFeaturePreview('GRADLE_METADATA')