added copyright & tradewartime licensing

kotlin upgrade to 2.1.0
ktor updgared to 3.1.6
less debug noise
yet no wasmJS

.gitignore

@@ -5,6 +5,7 @@ build/
 !**/src/test/**/build/
 
 ### IntelliJ IDEA ###
+.idea
 .idea/modules.xml
 .idea/jarRepositories.xml
 .idea/compiler.xml
@@ -43,3 +44,4 @@ out/
 # More
 .kotlin
 /.idea/workspace.xml
+/.gigaide/gigaide.properties

.idea/misc.xml

@@ -3,7 +3,7 @@
   <component name="FrameworkDetectionExcludesConfiguration">
     <file type="web" url="file://$PROJECT_DIR$" />
   </component>
-  <component name="ProjectRootManager" version="2" languageLevel="JDK_17" default="true" project-jdk-name="17 (5)" project-jdk-type="JavaSDK">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_17" default="true" project-jdk-name="corretto-17" project-jdk-type="JavaSDK">
     <output url="file://$PROJECT_DIR$/out" />
   </component>
 </project>

README.md

@@ -1,7 +1,7 @@
 # Kiloparsec
 
 __Recommended version is `0.4.1`: to keep the code compatible with current and further versions we
-ask to upgrade to `0.4.2` at least.__ Starting from this version some pacakage names are changed for
+ask to upgrade to `0.4.2` at least.__ Starting from this version some package names are changed for
 better clarity and fast UDP endpoints are added.
 
 The new generation of __PARanoid SECurity__ protocol, advanced, faster, more secure. It also allows connecting any "
@@ -9,16 +9,18 @@ block device" transport to the same local interface. Out if the box it
 provides the following transports:
 
 | name              | JVM    | JS | native |
-|----------------|--------|----|--------|
+|-------------------|--------|----|--------|
 | TCP/IP server     | ✓      |    | 0.2.6+ |
 | TCP/IP client     | ✓      |    | 0.2.6+ |
 | UDP server        | 0.3.2+ |    | 0.3.2+ |
 | UDP client        | 0.3.2+ |    | 0.3.2+ |
-| Websock server | ✓      |    |        |
-| Websock client | ✓      | ✓  | ✓      |
+| Websockets server | ✓      |    |        |
+| Websockets client | ✓      | ✓  | ✓      |
 
 ### Note on version compatibility
 
+Version 0.5.1 could be backward incompatible due to upgrade of the crypto2.
+
 Protocols >= 0.3.0 are not binary compatible with previous version due to more compact binary
 format. The format from 0.3.0 onwards is supposed to keep compatible.
 
@@ -34,8 +36,8 @@ We recommend to upgrade to 0.4+ ASAP as public/shared key id derivation method w
 
 ### Non-native targets
 
-- JS (browser and nodeJS)
-- JVM (android, macos, windows, linx, everywhere where JRE is installed)
+- JS (browser and Node.js)
+- JVM (android, macOS, windows, linux, everywhere where JRE is installed)
 
 ## TCP/IP and UDP transports
 
@@ -44,13 +46,13 @@ there is currently no widely adopted sockets for browser javascript.
 
 While UDP is faster than TCP/IP, it is less reliable, especially with commands and return values that serializes to more than 240 bytes approx, and has no retransmission facilities (use TCP!). UDP though shines when all you need is to [push](https://code.sergeych.net/docs/kiloparsec/kiloparsec/net.sergeych.kiloparsec/-remote-interface/push.html) with little or no data in it.
 
-## Websock server
+## Websockets server
 
 While it is much slower than TCP or UDP, it is still faster than any http-based API; it uses binary frames based on
 the Ktor server framework to easily integrate with web services. We recommend using it instead of a classic HTTP API as
 it beats it in terms of speed and server load even with HTTP/2.
 
-We recommend to create the `KiloInterface<S>` instance and connect it to the websock and tcp servers in real
+We recommend to create the `KiloInterface<S>` instance and connect it to the websockets and tcp servers in real
 applications to get easy access from anywhere.
 
 ## Websocket client
@@ -109,7 +111,7 @@ val cmdPushClient by command<String, Unit>()
 ## Call it from the client:
 
 Remember, we need to implement client interface `cmdPushClient` in our example, so we need to provide
-local interace too:
+local interface too:
 
 ```kotlin
 // Unit: no session on the client:
@@ -139,7 +141,7 @@ assertEquals(FooArgs("bar", 117), client.call(cmdGetFoo))
 ## Create ktor-based server
 
 Normally server side needs some session. It is convenient and avoid sending repeating data on each request speeding up
-the protocol. With KILOPARSEC it is rather basic operation:
+the protocol. With KILOPARSEC, it is rather basic operation:
 
 ~~~kotlin
 // Our session just keeps Foo for cmd{Get|Set}Foo:
@@ -196,9 +198,9 @@ Is very much straightforward, same as with TCP/IP:
 #### Command size
 
 Each command invocation and result are packed in a separate UDP diagram using effective binary packing. 
-Thus for the best results commands and results should be relatively short, best to fit into 240 bytes. While bigger datagrams are often transmitted successfully, the probability of the effective transmission drops with the size.
+Thus, for the best results commands and results should be relatively short, best to fit into 240 bytes. While bigger datagrams are often transmitted successfully, the probability of the effective transmission drops with the size.
 
-Kiloparsec UDP transport does not retransmits not delivered packets. Use TCP/IP or websocket if it is a concern.
+Kiloparsec UDP transport does not retransmit not delivered packets. Use TCP/IP or websocket if it is a concern.
 
 For the best results we recommend using [push](https://code.sergeych.net/docs/kiloparsec/kiloparsec/net.sergeych.kiloparsec/-remote-interface/index.html#1558240250%2FFunctions%2F788909594) for remote interfaces with UDP.
 
@@ -208,7 +210,7 @@ As Datagrams do not form protocol itself, kiloparsec issues pings when no data i
 When no pings are received long enough, kiloparsec connection is closed. There are `maxInactivityTimeout` in all
 relevant functions and constructors.
 
-Client shoudl not issue pings manually.
+Client should not issue pings manually.
 
 ## Reusing code between servers
 
@@ -220,12 +222,11 @@ This is a common proactive to create a business logic in a `KiloInterface`, then
 
 We do not recommend to rely on TLS (HTTPS://, WSS://) host identification solely, in the modern world there is
 a high probability of attacks on unfriendly (in respect to at least some of your users) states to the SSL certificates
-chain, in which case the MITM and spoofing will be undetected. Check the [remoteId](https://code.sergeych.net/docs/kiloparsec/kiloparsec/net.sergeych.kiloparsec/-kilo-client/remote-id.html?query=suspend%20fun%20remoteId():%20VerifyingPublicKey?) in your client on each connection and provide the safe [serverSecretKey](https://code.sergeych.net/docs/kiloparsec/kiloparsec/net.sergeych.kiloparsec/-kilo-server/index.html) when creating a server.
+chain, in which case the [MITM attack] and spoofing will be undetected. Check the [remoteId](https://code.sergeych.net/docs/kiloparsec/kiloparsec/net.sergeych.kiloparsec/-kilo-client/remote-id.html?query=suspend%20fun%20remoteId():%20VerifyingPublicKey?) in your client on each connection and provide the safe [serverSecretKey](https://code.sergeych.net/docs/kiloparsec/kiloparsec/net.sergeych.kiloparsec/-kilo-server/index.html) when creating a server.
 
-This will effectively protetcs against certificate chain spoofing in the case of the application installed from the trusted source.
+This will effectively protect against certificate chain spoofing in the case of the application installed from the trusted source.
 
-__Important note__. The web application could not be completely secured this way unless is loaded from the IP-address, as the DNS could be spoofed the same, especially when used with `Cloudflare` or other CDN that can
-transparently substitute the whole site. In the case of we applications we strongly recommend not to use CDN except your own where you can control actual traffic rules.
+__Important note__. The web application could not be completely secured this way unless is loaded from the IP-address, as the DNS could be spoofed the same, especially when used with `Cloudflare` or other CDN that can transparently substitute the whole site. For applications, we strongly recommend not to use CDN except your own, controlled ones. You generally can't neither detect nor repel [MITM attack] performed from _any single cloudflare 'ray'_.
 
 ## See also:
 
@@ -252,13 +253,13 @@ All RPC is performed over the encrypted connection.
 
 # Technical description
 
-Kiloparsec is a dull-duplex fully async (coroutine based) Remote Procedure Call protocol with typed parameters
+Kiloparsec is a full-duplex fully async (coroutine based) Remote Procedure Call protocol with typed parameters
 and support for serializing exceptions (e.g. exception thrown while executing remote command will be caught and
 rethrown at the caller context).
 
 Kiloparsec is not REST, it _has advanced session mechanisms_ and built-in authentication based on the same curve keys.
 Integrated tools to prevent MITM attacks include also non-transferred independently generated token that is calculated
-independently on the ends and is never transferred with the network. Comparing it somehow (visually, with QR code, etc)
+independently on the ends and is never transferred with the network. Comparing it somehow (visually, with QR code, etc.)
 could add a very robust guarantee of the connection safety and ingenuity.
 
 Kiloparsec has built-in completely asynchronous (coroutine based top-down) transport layer based on TCP (JVM only as for
@@ -267,4 +268,10 @@ JVM only insofar.
 
 # Licensing
 
-Currently, you need to obtain a license from https://8-rays.dev or Sergey Chernov.
+This is work in progress, not yet moved to public domain;
+ you need to obtain a license from https://8-rays.dev or [Sergey Chernov]. For open source projects it will most be free on some special terms.
+
+It will be moved to open source; we also guarantee that it will be moved to open source immediately if the software export restrictions will be lifted. We do not support such practices here at 8-rays.dev.
+
+[MITM]: https://en.wikipedia.org/wiki/Man-in-the-middle_attack
+[Sergey Chernov]: https://t.me/real_sergeych

bin/pubdocs

@@ -1,4 +1,14 @@
 #!/bin/bash
+#
+# Copyright (c) 2025. Sergey S. Chernov - All Rights Reserved
+#
+#  You may use, distribute and modify this code under the
+# terms of the private license, which you must obtain from the author
+#
+# To obtain the license, contact the author: https://t.me/real_sergeych or email to
+# real dot sergeych at gmail.
+#
+
 set -e
 ./gradlew dokkaHtml
 rsync -avz ./build/dokka/* code.sergeych.net:/bigstore/sergeych_pub/code/docs/kiloparsec

build.gradle.kts

@@ -1,36 +1,52 @@
+/*
+ * Copyright (c) 2025. Sergey S. Chernov - All Rights Reserved
+ *
+ *  You may use, distribute and modify this code under the
+ * terms of the private license, which you must obtain from the author
+ *
+ * To obtain the license, contact the author: https://t.me/real_sergeych or email to
+ * real dot sergeych at gmail.
+ */
+
 plugins {
-    kotlin("multiplatform") version "2.0.10"
-    id("org.jetbrains.kotlin.plugin.serialization") version "2.0.0"
+    kotlin("multiplatform") version "2.1.0"
+    id("org.jetbrains.kotlin.plugin.serialization") version "2.1.0"
     `maven-publish`
     id("org.jetbrains.dokka") version "1.9.20"
 }
 
 group = "net.sergeych"
-version = "0.4.1"
+version = "0.6.1-SNAPSHOT"
 
 repositories {
     mavenCentral()
     mavenLocal()
     maven("https://maven.universablockchain.com/")
     maven("https://gitea.sergeych.net/api/packages/SergeychWorks/maven")
+    maven("https://gitea.sergeych.net/api/packages/YoungBlood/maven")
 }
 
 kotlin {
+    jvmToolchain(17)
     jvm()
     js {
         browser {
         }
         nodejs()
     }
-    macosArm64()
-    iosX64()
-    iosArm64()
-    iosSimulatorArm64()
+//    macosArm64()
+//    iosX64()
+//    iosArm64()
+//    iosSimulatorArm64()
     linuxX64()
     linuxArm64()
-    macosX64()
+//    macosX64()
+//    macosX64()
+    mingwX64()
+//    @OptIn(ExperimentalWasmDsl::class)
+//    wasmJs()
 
-    val ktor_version = "2.3.12"
+    val ktor_version = "3.1.0"
 
     sourceSets {
         all {
@@ -41,10 +57,10 @@ kotlin {
 
         val commonMain by getting {
             dependencies {
-                implementation("org.jetbrains.kotlinx:kotlinx-coroutines-core:1.7.3")
-                implementation("org.jetbrains.kotlinx:kotlinx-serialization-json:1.7.1")
+                implementation("org.jetbrains.kotlinx:kotlinx-coroutines-core:1.10.1")
+                implementation("org.jetbrains.kotlinx:kotlinx-serialization-json:1.7.2")
                 api("io.ktor:ktor-client-core:$ktor_version")
-                api("net.sergeych:crypto2:0.5.3")
+                api("net.sergeych:crypto2:0.7.2-SNAPSHOT")
             }
         }
         val ktorSocketMain by creating {
@@ -83,27 +99,27 @@ kotlin {
             }
         }
         val jsTest by getting
-        val macosArm64Main by getting {
-            dependsOn(ktorSocketMain)
-        }
-        val macosArm64Test by getting {
-            dependsOn(ktorSocketTest)
-        }
-        val macosX64Main by getting {
-            dependsOn(ktorSocketMain)
-        }
-        val iosX64Main by getting {
-            dependsOn(ktorSocketMain)
-        }
-        val iosX64Test by getting {
-            dependsOn(ktorSocketTest)
-        }
-        val iosArm64Main by getting {
-            dependsOn(ktorSocketMain)
-        }
-        val iosArm64Test by getting {
-            dependsOn(ktorSocketTest)
-        }
+//        val macosArm64Main by getting {
+//            dependsOn(ktorSocketMain)
+//        }
+//        val macosArm64Test by getting {
+//            dependsOn(ktorSocketTest)
+//        }
+//        val macosX64Main by getting {
+//            dependsOn(ktorSocketMain)
+//        }
+//        val iosX64Main by getting {
+//            dependsOn(ktorSocketMain)
+//        }
+//        val iosX64Test by getting {
+//            dependsOn(ktorSocketTest)
+//        }
+//        val iosArm64Main by getting {
+//            dependsOn(ktorSocketMain)
+//        }
+//        val iosArm64Test by getting {
+//            dependsOn(ktorSocketTest)
+//        }
         val linuxArm64Main by getting {
             dependsOn(ktorSocketMain)
         }

gradle.properties

@@ -1,2 +1,12 @@
+#
+# Copyright (c) 2025. Sergey S. Chernov - All Rights Reserved
+#
+#  You may use, distribute and modify this code under the
+# terms of the private license, which you must obtain from the author
+#
+# To obtain the license, contact the author: https://t.me/real_sergeych or email to
+# real dot sergeych at gmail.
+#
+
 kotlin.code.style=official
 kotlin.mpp.applyDefaultHierarchyTemplate=false

gradle/wrapper/gradle-wrapper.properties

@@ -1,3 +1,13 @@
+#
+# Copyright (c) 2025. Sergey S. Chernov - All Rights Reserved
+#
+#  You may use, distribute and modify this code under the
+# terms of the private license, which you must obtain from the author
+#
+# To obtain the license, contact the author: https://t.me/real_sergeych or email to
+# real dot sergeych at gmail.
+#
+
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 distributionUrl=https\://services.gradle.org/distributions/gradle-8.2-bin.zip

gradlew

@@ -1,19 +1,13 @@
 #!/bin/sh
 
 #
-# Copyright © 2015-2021 the original authors.
+# Copyright (c) 2025. Sergey S. Chernov - All Rights Reserved
 #
-# 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
+#  You may use, distribute and modify this code under the
+# terms of the private license, which you must obtain from the author
 #
-#      https://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.
+# To obtain the license, contact the author: https://t.me/real_sergeych or email to
+# real dot sergeych at gmail.
 #
 
 ##############################################################################

settings.gradle.kts

@@ -1,3 +1,13 @@
+/*
+ * Copyright (c) 2025. Sergey S. Chernov - All Rights Reserved
+ *
+ *  You may use, distribute and modify this code under the
+ * terms of the private license, which you must obtain from the author
+ *
+ * To obtain the license, contact the author: https://t.me/real_sergeych or email to
+ * real dot sergeych at gmail.
+ */
+
 pluginManagement {
     repositories {
         mavenCentral()

src/commonMain/kotlin/net/sergeych/kiloparsec/AsyncVarint.kt

@@ -1,3 +1,13 @@
+/*
+ * Copyright (c) 2025. Sergey S. Chernov - All Rights Reserved
+ *
+ *  You may use, distribute and modify this code under the
+ * terms of the private license, which you must obtain from the author
+ *
+ * To obtain the license, contact the author: https://t.me/real_sergeych or email to
+ * real dot sergeych at gmail.
+ */
+
 package net.sergeych.kiloparsec
 
 import io.ktor.utils.io.*

src/commonMain/kotlin/net/sergeych/kiloparsec/AtomicAsyncValue.kt

@@ -0,0 +1,52 @@
+/*
+ * Copyright (c) 2025. Sergey S. Chernov - All Rights Reserved
+ *
+ *  You may use, distribute and modify this code under the
+ * terms of the private license, which you must obtain from the author
+ *
+ * To obtain the license, contact the author: https://t.me/real_sergeych or email to
+ * real dot sergeych at gmail.
+ */
+
+package net.sergeych.kiloparsec
+
+import kotlinx.coroutines.sync.Mutex
+import kotlinx.coroutines.sync.withLock
+
+/**
+ * Multiplatform atomically mutable value to be used in [kotlinx.coroutines],
+ * with suspending mutating operations, see [mutate].
+ *
+ * Actual value can be either changed in a block of [mutate] when
+ * new value _depends on the current value_ or with [reset].
+ *
+ * [value] getter is suspended because it waits until the mutation finishes
+ */
+open class AtomicAsyncValue<T>(initialValue: T) {
+    private var actualValue = initialValue
+    private val access = Mutex()
+
+    /**
+     * Change the value: get the current and set to the returned, all in the
+     * atomic suspend operation. All other mutating requests including assigning to [value]
+     * will be blocked and queued.
+     * @return result of the mutation. Note that immediate call to property [value]
+     *      could already return modified bu some other thread value!
+     */
+    suspend fun mutate(mutator: suspend (T) -> T): T = access.withLock {
+        actualValue = mutator(actualValue)
+        actualValue
+    }
+
+    /**
+     * Atomic get or set the value. Atomic get means if there is a [mutate] in progress
+     * it will wait until the mutation finishes and then return the correct result.
+     */
+    suspend fun value() = access.withLock { actualValue }
+
+    /**
+     * Set the new value without checking it. Shortcut to
+     * ```mutate { value = newValue }```
+     */
+    suspend fun reset(value: T) = mutate { value }
+}

src/commonMain/kotlin/net/sergeych/kiloparsec/Command.kt

@@ -1,3 +1,13 @@
+/*
+ * Copyright (c) 2025. Sergey S. Chernov - All Rights Reserved
+ *
+ *  You may use, distribute and modify this code under the
+ * terms of the private license, which you must obtain from the author
+ *
+ * To obtain the license, contact the author: https://t.me/real_sergeych or email to
+ * real dot sergeych at gmail.
+ */
+
 package net.sergeych.kiloparsec
 
 import kotlinx.serialization.KSerializer
@@ -5,6 +15,8 @@ import kotlinx.serialization.Serializable
 import net.sergeych.bintools.toDataSource
 import net.sergeych.bipack.BipackDecoder
 import net.sergeych.bipack.BipackEncoder
+import net.sergeych.kiloparsec.Command.Call
+import net.sergeych.kiloparsec.Command.Companion.unpackCall
 import net.sergeych.utools.unpack
 
 /**
@@ -12,8 +24,20 @@ import net.sergeych.utools.unpack
  * in node-2-node protocols and client API, and most importantly in calling smart contract
  * methods. This is essentially a Kotlin binding to typesafe serialize command calls and
  * deserialize results.
+ *
+ * To create command instances, it is recommended to use [command] that returns [CommandDelegate].
+ *
+ * Use [packCall] to serialize the command call with some arguments.
+ *
+ * Note that `Command` instances themselves are not serialized, instead, the call is serialized,
+ * in the form of [Call], containing name and properly serialized arguments.
+ *
+ * [unpackCall] deserialized result of the [packCall] so the proper handler for the command could
+ * be used. Then the result of the execution could be packed with [exec] and then unpacked with
+ * [unpackResult].
+ *
  */
-class Command<A, R>(
+open class Command<A, R>(
     val name: String,
     val argsSerializer: KSerializer<A>,
     val resultSerializer: KSerializer<R>
@@ -21,13 +45,29 @@ class Command<A, R>(
     @Serializable
     data class Call(val name: String,val serializedArgs: UByteArray)
 
-    fun packCall(args: A): UByteArray = BipackEncoder.encode(
-        Call(name, BipackEncoder.encode(argsSerializer, args).toUByteArray())
-    ).toUByteArray()
+    /**
+     * Pack command invocation with specified arguments.
+     */
+    fun packCall(args: A): UByteArray = BipackEncoder.encode(createCall(args)).toUByteArray()
 
+    /**
+     * Create [Call] instance for specified args vy serializing it properly
+     */
+    fun createCall(args: A): Call = Call(name, BipackEncoder.encode(argsSerializer, args).toUByteArray())
+
+    /**
+     * Unpack result, obtained by [exec].
+     */
     fun unpackResult(packedResult: UByteArray): R =
         unpack(resultSerializer, packedResult)
 
+    /**
+     * Execute a command unpacking args.
+     *
+     * @param packedArgs arguments, as provided by [packCall] in the [Call] instance
+     * @param handler actual code to execute the command
+     * @return properly serialized result to be unpacked with [unpackResult].
+     */
     suspend fun exec(packedArgs: UByteArray, handler: suspend (A) -> R): UByteArray =
         BipackEncoder.encode(
             resultSerializer,
@@ -36,6 +76,10 @@ class Command<A, R>(
         ).toUByteArray()
 
     companion object {
+        /**
+         * Unpack command invocation instance from [packCall]. Use [exec] to deserialize arguments and
+         * perform command.
+         */
         fun unpackCall(packedCall: UByteArray): Call = BipackDecoder.decode(packedCall.toDataSource())
     }
 }

src/commonMain/kotlin/net/sergeych/kiloparsec/CommandDelegate.kt

@@ -1,3 +1,13 @@
+/*
+ * Copyright (c) 2025. Sergey S. Chernov - All Rights Reserved
+ *
+ *  You may use, distribute and modify this code under the
+ * terms of the private license, which you must obtain from the author
+ *
+ * To obtain the license, contact the author: https://t.me/real_sergeych or email to
+ * real dot sergeych at gmail.
+ */
+
 package net.sergeych.kiloparsec
 
 import kotlinx.serialization.KSerializer

src/commonMain/kotlin/net/sergeych/kiloparsec/ConnectionFactory.kt

@@ -1,3 +1,13 @@
+/*
+ * Copyright (c) 2025. Sergey S. Chernov - All Rights Reserved
+ *
+ *  You may use, distribute and modify this code under the
+ * terms of the private license, which you must obtain from the author
+ *
+ * To obtain the license, contact the author: https://t.me/real_sergeych or email to
+ * real dot sergeych at gmail.
+ */
+
 package net.sergeych.kiloparsec
 
 /**

src/commonMain/kotlin/net/sergeych/kiloparsec/ExceptionWithCode.kt

@@ -0,0 +1,16 @@
+/*
+ * Copyright (c) 2025. Sergey S. Chernov - All Rights Reserved
+ *
+ *  You may use, distribute and modify this code under the
+ * terms of the private license, which you must obtain from the author
+ *
+ * To obtain the license, contact the author: https://t.me/real_sergeych or email to
+ * real dot sergeych at gmail.
+ */
+
+package net.sergeych.kiloparsec
+
+interface ExceptionWithCode {
+    val code: String
+    val message: String?
+}

src/commonMain/kotlin/net/sergeych/kiloparsec/KiloClient.kt

@@ -1,3 +1,13 @@
+/*
+ * Copyright (c) 2025. Sergey S. Chernov - All Rights Reserved
+ *
+ *  You may use, distribute and modify this code under the
+ * terms of the private license, which you must obtain from the author
+ *
+ * To obtain the license, contact the author: https://t.me/real_sergeych or email to
+ * real dot sergeych at gmail.
+ */
+
 package net.sergeych.kiloparsec
 
 import kotlinx.coroutines.CancellationException
@@ -9,6 +19,7 @@ import kotlinx.coroutines.isActive
 import kotlinx.coroutines.sync.Mutex
 import kotlinx.coroutines.sync.withLock
 import net.sergeych.crypto2.SigningKey
+import net.sergeych.crypto2.VerifyingKey
 import net.sergeych.crypto2.VerifyingPublicKey
 import net.sergeych.mp_logger.LogTag
 import net.sergeych.mp_logger.Loggable
@@ -60,6 +71,14 @@ class KiloClient<S>(
     @Suppress("unused")
     val connectedStateFlow = _state.asStateFlow()
 
+    /**
+     * The verifying, or public, key identifying client sessions. It could be used to
+     * restore environment on reconnection. This is what remote side, e.g. server, sees as
+     * [KiloScope.remoteIdentity].
+     */
+    @Suppress("unused")
+    val localIdentity: VerifyingKey? = secretKey?.verifyingKey
+
     private var deferredClient = CompletableDeferred<KiloClientConnection<S>>()
 
     private val job =
@@ -141,7 +160,7 @@ class KiloClient<S>(
      * a key. Connection is established either with a properly authenticated key or no key at all.
      */
     @Suppress("unused")
-    suspend fun remoteId(): VerifyingPublicKey? = deferredClient.await().remoteId()
+    suspend fun remoteIdentity(): VerifyingPublicKey? = deferredClient.await().remoteId()
 
     companion object {
         class Builder<S>() {
@@ -156,8 +175,19 @@ class KiloClient<S>(
             var secretIdKey: SigningKey? = null
 
             /**
-             * Build local command implementations (remotely callable ones), exception
-             * class handlers, etc.
+             * Build local command implementations, those callable from the server, exception
+             * class handlers, and anything else [KiloInterface] allows. Usage sample:
+             * 
+             * ```kotlin
+             * val client = KiloClient {
+             *     connect { connectTcpDevice("localhost:$port") }
+             *     local {
+             *         on(cmdPing) {
+             *             "pong! $it"
+             *         }
+             *     }
+             * }
+             * ```
              */
             fun local(f: KiloInterface<S>.() -> Unit) {
                 interfaceBuilder = f

src/commonMain/kotlin/net/sergeych/kiloparsec/KiloClientConnection.kt

@@ -1,3 +1,13 @@
+/*
+ * Copyright (c) 2025. Sergey S. Chernov - All Rights Reserved
+ *
+ *  You may use, distribute and modify this code under the
+ * terms of the private license, which you must obtain from the author
+ *
+ * To obtain the license, contact the author: https://t.me/real_sergeych or email to
+ * real dot sergeych at gmail.
+ */
+
 package net.sergeych.kiloparsec
 
 import kotlinx.coroutines.*
@@ -80,7 +90,7 @@ class KiloClientConnection<S>(
                 kiloRemoteInterface.complete(
                     KiloRemoteInterface(deferredParams, clientInterface)
                 )
-                clientInterface.onConnectHandler?.invoke(params.scope)
+                clientInterface.onConnectHandlers.invokeAll(params.scope)
                 onConnectedStateChanged?.invoke(true)
                 job.join()
 
@@ -105,3 +115,6 @@ class KiloClientConnection<S>(
         kiloRemoteInterface.await().push(cmd, args)
     }
 }
+
+internal fun <S>Collection<KiloHandler<S>>.invokeAll(scope: KiloScope<S>) =
+    forEach { runCatching { scope.it() } }

src/commonMain/kotlin/net/sergeych/kiloparsec/KiloInterface.kt

@@ -1,5 +1,16 @@
+/*
+ * Copyright (c) 2025. Sergey S. Chernov - All Rights Reserved
+ *
+ *  You may use, distribute and modify this code under the
+ * terms of the private license, which you must obtain from the author
+ *
+ * To obtain the license, contact the author: https://t.me/real_sergeych or email to
+ * real dot sergeych at gmail.
+ */
+
 package net.sergeych.kiloparsec
 
+typealias KiloHandler<S> = KiloScope<S>.()->Unit
 /**
  * The local interface to provide functions, register errors for Kiloparsec users. Use it
  * with [KiloClient], [KiloClientConnection], [KiloServerConnection], etc.
@@ -14,12 +25,19 @@ package net.sergeych.kiloparsec
  */
 open class KiloInterface<S> : LocalInterface<KiloScope<S>>() {
 
-    internal var onConnectHandler: (KiloScope<S>.()->Unit) ? = null
+    internal val onConnectHandlers = mutableListOf<KiloHandler<S>>()
 
-    fun onConnected(f: KiloScope<S>.()->Unit) { onConnectHandler = f }
+    /**
+     * Registers handler [f] for [onConnected] event, to the head or the end of handler list.
+     *
+     * @param addFirst if true, [f] will be added to the beginning of the list of handlers
+     */
+    fun onConnected(addFirst: Boolean = false, f: KiloScope<S>.()->Unit) {
+        if( addFirst ) onConnectHandlers.add(0, f) else  onConnectHandlers += f
+    }
 
     init {
-        registerError { RemoteInterface.UnknownCommand() }
+        registerError { RemoteInterface.UnknownCommand(it) }
         registerError { RemoteInterface.InternalError(it) }
         registerError { RemoteInterface.ClosedException(it) }
 //        registerError { RemoteInterface.SecurityException(it) }

src/commonMain/kotlin/net/sergeych/kiloparsec/KiloL0Interface.kt

@@ -1,3 +1,13 @@
+/*
+ * Copyright (c) 2025. Sergey S. Chernov - All Rights Reserved
+ *
+ *  You may use, distribute and modify this code under the
+ * terms of the private license, which you must obtain from the author
+ *
+ * To obtain the license, contact the author: https://t.me/real_sergeych or email to
+ * real dot sergeych at gmail.
+ */
+
 package net.sergeych.kiloparsec
 
 import kotlinx.coroutines.CompletableDeferred

src/commonMain/kotlin/net/sergeych/kiloparsec/KiloParams.kt

@@ -1,3 +1,13 @@
+/*
+ * Copyright (c) 2025. Sergey S. Chernov - All Rights Reserved
+ *
+ *  You may use, distribute and modify this code under the
+ * terms of the private license, which you must obtain from the author
+ *
+ * To obtain the license, contact the author: https://t.me/real_sergeych or email to
+ * real dot sergeych at gmail.
+ */
+
 package net.sergeych.kiloparsec
 
 import kotlinx.serialization.Serializable

src/commonMain/kotlin/net/sergeych/kiloparsec/KiloRemoteInterface.kt

@@ -1,3 +1,13 @@
+/*
+ * Copyright (c) 2025. Sergey S. Chernov - All Rights Reserved
+ *
+ *  You may use, distribute and modify this code under the
+ * terms of the private license, which you must obtain from the author
+ *
+ * To obtain the license, contact the author: https://t.me/real_sergeych or email to
+ * real dot sergeych at gmail.
+ */
+
 package net.sergeych.kiloparsec
 
 import kotlinx.coroutines.CompletableDeferred

src/commonMain/kotlin/net/sergeych/kiloparsec/KiloScope.kt

@@ -1,3 +1,13 @@
+/*
+ * Copyright (c) 2025. Sergey S. Chernov - All Rights Reserved
+ *
+ *  You may use, distribute and modify this code under the
+ * terms of the private license, which you must obtain from the author
+ *
+ * To obtain the license, contact the author: https://t.me/real_sergeych or email to
+ * real dot sergeych at gmail.
+ */
+
 package net.sergeych.kiloparsec
 
 import net.sergeych.crypto2.SigningKey

src/commonMain/kotlin/net/sergeych/kiloparsec/KiloServer.kt

@@ -1,3 +1,13 @@
+/*
+ * Copyright (c) 2025. Sergey S. Chernov - All Rights Reserved
+ *
+ *  You may use, distribute and modify this code under the
+ * terms of the private license, which you must obtain from the author
+ *
+ * To obtain the license, contact the author: https://t.me/real_sergeych or email to
+ * real dot sergeych at gmail.
+ */
+
 package net.sergeych.kiloparsec
 
 import kotlinx.coroutines.CancellationException

src/commonMain/kotlin/net/sergeych/kiloparsec/KiloServerConnection.kt

@@ -1,3 +1,13 @@
+/*
+ * Copyright (c) 2025. Sergey S. Chernov - All Rights Reserved
+ *
+ *  You may use, distribute and modify this code under the
+ * terms of the private license, which you must obtain from the author
+ *
+ * To obtain the license, contact the author: https://t.me/real_sergeych or email to
+ * real dot sergeych at gmail.
+ */
+
 package net.sergeych.kiloparsec
 
 import kotlinx.coroutines.CompletableDeferred
@@ -75,7 +85,7 @@ class KiloServerConnection<S>(
                 kiloRemoteInterface.complete(
                     KiloRemoteInterface(deferredParams, clientInterface)
                 )
-                clientInterface.onConnectHandler?.invoke(p.scope)
+                clientInterface.onConnectHandlers.invokeAll(p.scope)
             }
         }
 

src/commonMain/kotlin/net/sergeych/kiloparsec/LocalInterface.kt

@@ -1,3 +1,13 @@
+/*
+ * Copyright (c) 2025. Sergey S. Chernov - All Rights Reserved
+ *
+ *  You may use, distribute and modify this code under the
+ * terms of the private license, which you must obtain from the author
+ *
+ * To obtain the license, contact the author: https://t.me/real_sergeych or email to
+ * real dot sergeych at gmail.
+ */
+
 package net.sergeych.kiloparsec
 
 import net.sergeych.mp_logger.LogTag
@@ -67,7 +77,7 @@ open class LocalInterface<S> : Loggable by LogTag("LocalInterface${idCounter.inc
         name: String,
         packedArgs: UByteArray,
     ): UByteArray =
-        (commands[name] ?: throw RemoteInterface.UnknownCommand())
+        (commands[name] ?: throw RemoteInterface.UnknownCommand(name))
             .invoke(scope, packedArgs)
 
 
@@ -106,7 +116,8 @@ open class LocalInterface<S> : Loggable by LogTag("LocalInterface${idCounter.inc
     }
 
     fun getErrorCode(t: Throwable): String? =
-        errorByClass[t::class] ?: errorProviders.firstNonNull { it.getErrorCode(t) }
+        (t as? ExceptionWithCode)?.code
+            ?: errorByClass[t::class] ?: errorProviders.firstNonNull { it.getErrorCode(t) }
 
     fun encodeError(forId: UInt, t: Throwable): Transport.Block.Error =
         if (t is RemoteInterface.ClosedException) {

src/commonMain/kotlin/net/sergeych/kiloparsec/RemoteInterface.kt

@@ -1,3 +1,13 @@
+/*
+ * Copyright (c) 2025. Sergey S. Chernov - All Rights Reserved
+ *
+ *  You may use, distribute and modify this code under the
+ * terms of the private license, which you must obtain from the author
+ *
+ * To obtain the license, contact the author: https://t.me/real_sergeych or email to
+ * real dot sergeych at gmail.
+ */
+
 package net.sergeych.kiloparsec
 
 /**
@@ -40,7 +50,7 @@ interface RemoteInterface {
     /**
      * Command is not supported by the remote party
      */
-    class UnknownCommand : RemoteException("UnknownCommand")
+    class UnknownCommand(commandName: String) : RemoteException("UnknownCommand: $commandName")
 
     open class InternalError(code: String="0"): RemoteException("Internal error: $code")
 

src/commonMain/kotlin/net/sergeych/kiloparsec/Transport.kt

@@ -1,3 +1,13 @@
+/*
+ * Copyright (c) 2025. Sergey S. Chernov - All Rights Reserved
+ *
+ *  You may use, distribute and modify this code under the
+ * terms of the private license, which you must obtain from the author
+ *
+ * To obtain the license, contact the author: https://t.me/real_sergeych or email to
+ * real dot sergeych at gmail.
+ */
+
 package net.sergeych.kiloparsec
 
 import kotlinx.coroutines.*
@@ -124,7 +134,7 @@ class Transport<S>(
         }
 
         // now we have mutex freed so we can call:
-        val r = runCatching { device.output.send(pack(b).also { debug { ">>>\n${it.toDump()}" } }) }
+        val r = runCatching { device.output.send(pack(b)) }
         if (!r.isSuccess) {
             r.exceptionOrNull()?.let {
                 exception { "failed to send output block" to it }
@@ -184,10 +194,7 @@ class Transport<S>(
             while (isActive && !isClosed) {
                 try {
                     device.input.receive().let { packed ->
-                        debug { "<<<\n${packed.toDump()}" }
                         val b = unpack<Block>(packed)
-                        debug { "<<$ $b" }
-                        debug { "access state: ${access.isLocked}" }
                         when (b) {
                             is Block.Error -> access.withLock {
                                 val error = localInterface.decodeError(b)
@@ -198,10 +205,7 @@ class Transport<S>(
                             }
 
                             is Block.Response -> access.withLock {
-                                calls.remove(b.forId)?.let {
-                                    debug { "activating wait handle for ${b.forId}" }
-                                    it.complete(b.packedResult)
-                                }
+                                calls.remove(b.forId)?.complete(b.packedResult)
                                     ?: warning { "wait handle not found for ${b.forId}" }
                             }
 
@@ -228,11 +232,10 @@ class Transport<S>(
                                 } catch (t: Throwable) {
                                     send(Block.Error(b.id, "UnknownError", t.message))
                                 }
-                                    .also { debug { "command executed: ${b.name}" } }
                             }
                         }
                     }
-                    debug { "input step performed closed=$isClosed active=$isActive" }
+//                    debug { "input step performed closed=$isClosed active=$isActive" }
                 } catch (_: ClosedSendChannelException) {
                     info { "closed send channel" }
                     isClosed = true

src/commonMain/kotlin/net/sergeych/kiloparsec/adapter/InetTransportDevice.kt

@@ -1,3 +1,13 @@
+/*
+ * Copyright (c) 2025. Sergey S. Chernov - All Rights Reserved
+ *
+ *  You may use, distribute and modify this code under the
+ * terms of the private license, which you must obtain from the author
+ *
+ * To obtain the license, contact the author: https://t.me/real_sergeych or email to
+ * real dot sergeych at gmail.
+ */
+
 package net.sergeych.kiloparsec.adapter
 
 import kotlinx.coroutines.channels.Channel

src/commonMain/kotlin/net/sergeych/kiloparsec/adapter/NetworkProvider.kt

@@ -1,3 +1,13 @@
+/*
+ * Copyright (c) 2025. Sergey S. Chernov - All Rights Reserved
+ *
+ *  You may use, distribute and modify this code under the
+ * terms of the private license, which you must obtain from the author
+ *
+ * To obtain the license, contact the author: https://t.me/real_sergeych or email to
+ * real dot sergeych at gmail.
+ */
+
 package net.sergeych.kiloparsec.adapter
 
 /**

src/commonMain/kotlin/net/sergeych/kiloparsec/adapter/ProxyDevice.kt

@@ -1,3 +1,13 @@
+/*
+ * Copyright (c) 2025. Sergey S. Chernov - All Rights Reserved
+ *
+ *  You may use, distribute and modify this code under the
+ * terms of the private license, which you must obtain from the author
+ *
+ * To obtain the license, contact the author: https://t.me/real_sergeych or email to
+ * real dot sergeych at gmail.
+ */
+
 package net.sergeych.kiloparsec.adapter
 
 import kotlinx.coroutines.channels.Channel

src/commonMain/kotlin/net/sergeych/kiloparsec/adapter/websocketClient.kt

@@ -1,3 +1,13 @@
+/*
+ * Copyright (c) 2025. Sergey S. Chernov - All Rights Reserved
+ *
+ *  You may use, distribute and modify this code under the
+ * terms of the private license, which you must obtain from the author
+ *
+ * To obtain the license, contact the author: https://t.me/real_sergeych or email to
+ * real dot sergeych at gmail.
+ */
+
 package net.sergeych.kiloparsec.adapter
 
 import io.ktor.client.*
@@ -11,10 +21,7 @@ import kotlinx.coroutines.channels.ClosedReceiveChannelException
 import kotlinx.coroutines.channels.ClosedSendChannelException
 import kotlinx.coroutines.launch
 import net.sergeych.crypto2.SigningKey
-import net.sergeych.kiloparsec.KiloClient
-import net.sergeych.kiloparsec.KiloConnectionData
-import net.sergeych.kiloparsec.KiloInterface
-import net.sergeych.kiloparsec.RemoteInterface
+import net.sergeych.kiloparsec.*
 import net.sergeych.mp_logger.LogTag
 import net.sergeych.mp_logger.exception
 import net.sergeych.mp_logger.info
@@ -24,23 +31,39 @@ import net.sergeych.tools.AtomicCounter
 
 private val counter = AtomicCounter()
 
+/**
+ * Shortcut to create websocket client. Use [websocketTransportDevice] with [KiloClient]
+ * for fine-grained control.
+ */
 fun <S> websocketClient(
     path: String,
     clientInterface: KiloInterface<S> = KiloInterface(),
-    client: HttpClient = HttpClient { install(WebSockets) },
     secretKey: SigningKey? = null,
     sessionMaker: () -> S = {
         @Suppress("UNCHECKED_CAST")
         Unit as S
     },
 ): KiloClient<S> {
+    return KiloClient(clientInterface, secretKey) {
+        KiloConnectionData(websocketTransportDevice(path), sessionMaker())
+    }
+}
+
+/**
+ * Create kilopaarsec transport over websocket (ws or wss).
+ * @param path websocket path (must start with ws:// or wss:// and contain a path part)
+ * @client use default [HttpClient], it installs [WebSockets] plugin
+ */
+fun websocketTransportDevice(
+    path: String,
+    client: HttpClient = HttpClient { install(WebSockets) },
+): Transport.Device {
     var u = Url(path)
     if (u.encodedPath.length <= 1)
         u = URLBuilder(u).apply {
             encodedPath = "/kp"
         }.build()
 
-    return KiloClient(clientInterface, secretKey) {
     val input = Channel<UByteArray>()
     val output = Channel<UByteArray>()
     val closeHandle = CompletableDeferred<Boolean>()
@@ -66,9 +89,8 @@ fun <S> websocketClient(
                     if (closeHandle.isActive) closeHandle.complete(true)
                 } catch (_: ClosedSendChannelException) {
                     log.info { "send channel closed" }
-                    }
-                    catch(_: CancellationException) {}
-                    catch(t: Throwable) {
+                } catch (_: CancellationException) {
+                } catch (t: Throwable) {
                     log.info { "unexpected exception in websock sender: ${t.stackTraceToString()}" }
                     closeHandle.completeExceptionally(t)
                 }
@@ -94,7 +116,7 @@ fun <S> websocketClient(
                     if (closeHandle.isActive) closeHandle.complete(false)
                 }
             }
-                if(!closeHandle.await()) {
+            if (!closeHandle.await()) {
                 log.warning { "Client is closing with error" }
                 throw RemoteInterface.ClosedException()
             }
@@ -109,6 +131,6 @@ fun <S> websocketClient(
         closeHandle.complete(true)
 //            job.cancel()
     }
-        KiloConnectionData(device, sessionMaker())
-    }
+    return device
 }
+

src/commonMain/kotlin/net/sergeych/kiloparsec/commands.kt

@@ -1,3 +1,13 @@
+/*
+ * Copyright (c) 2025. Sergey S. Chernov - All Rights Reserved
+ *
+ *  You may use, distribute and modify this code under the
+ * terms of the private license, which you must obtain from the author
+ *
+ * To obtain the license, contact the author: https://t.me/real_sergeych or email to
+ * real dot sergeych at gmail.
+ */
+
 package net.sergeych.kiloparsec
 
 import kotlinx.serialization.Serializable

src/commonMain/kotlin/net/sergeych/kiloparsec/tools.kt

@@ -1,3 +1,13 @@
+/*
+ * Copyright (c) 2025. Sergey S. Chernov - All Rights Reserved
+ *
+ *  You may use, distribute and modify this code under the
+ * terms of the private license, which you must obtain from the author
+ *
+ * To obtain the license, contact the author: https://t.me/real_sergeych or email to
+ * real dot sergeych at gmail.
+ */
+
 package net.sergeych.kiloparsec
 
 import kotlinx.coroutines.sync.Mutex

src/commonTest/kotlin/KeysTest.kt

@@ -1,3 +1,13 @@
+/*
+ * Copyright (c) 2025. Sergey S. Chernov - All Rights Reserved
+ *
+ *  You may use, distribute and modify this code under the
+ * terms of the private license, which you must obtain from the author
+ *
+ * To obtain the license, contact the author: https://t.me/real_sergeych or email to
+ * real dot sergeych at gmail.
+ */
+
 import kotlinx.coroutines.test.runTest
 import net.sergeych.crypto2.IllegalSignatureException
 import net.sergeych.crypto2.SealedBox

src/commonTest/kotlin/PackTest.kt

@@ -1,3 +1,13 @@
+/*
+ * Copyright (c) 2025. Sergey S. Chernov - All Rights Reserved
+ *
+ *  You may use, distribute and modify this code under the
+ * terms of the private license, which you must obtain from the author
+ *
+ * To obtain the license, contact the author: https://t.me/real_sergeych or email to
+ * real dot sergeych at gmail.
+ */
+
 import kotlinx.coroutines.test.runTest
 import kotlinx.datetime.Instant
 import net.sergeych.bipack.BipackEncoder

src/commonTest/kotlin/ToolsTest.kt

@@ -1,3 +1,13 @@
+/*
+ * Copyright (c) 2025. Sergey S. Chernov - All Rights Reserved
+ *
+ *  You may use, distribute and modify this code under the
+ * terms of the private license, which you must obtain from the author
+ *
+ * To obtain the license, contact the author: https://t.me/real_sergeych or email to
+ * real dot sergeych at gmail.
+ */
+
 class ToolsTest {
 //    @Test
 //    fun testRemoceCmd() {

src/commonTest/kotlin/TransportTest.kt

@@ -1,3 +1,13 @@
+/*
+ * Copyright (c) 2025. Sergey S. Chernov - All Rights Reserved
+ *
+ *  You may use, distribute and modify this code under the
+ * terms of the private license, which you must obtain from the author
+ *
+ * To obtain the license, contact the author: https://t.me/real_sergeych or email to
+ * real dot sergeych at gmail.
+ */
+
 import kotlinx.coroutines.*
 import kotlinx.coroutines.channels.Channel
 import kotlinx.coroutines.channels.ReceiveChannel

src/commonTest/kotlin/assertThrows.kt

@@ -1,3 +1,13 @@
+/*
+ * Copyright (c) 2025. Sergey S. Chernov - All Rights Reserved
+ *
+ *  You may use, distribute and modify this code under the
+ * terms of the private license, which you must obtain from the author
+ *
+ * To obtain the license, contact the author: https://t.me/real_sergeych or email to
+ * real dot sergeych at gmail.
+ */
+
 import kotlin.test.fail
 
 inline fun <reified T: Throwable>assertThrows(f: ()->Unit): T {

src/jvmMain/kotlin/net/sergeych/kiloparsec/adapter/WebsocketServer.kt

@@ -1,3 +1,13 @@
+/*
+ * Copyright (c) 2025. Sergey S. Chernov - All Rights Reserved
+ *
+ *  You may use, distribute and modify this code under the
+ * terms of the private license, which you must obtain from the author
+ *
+ * To obtain the license, contact the author: https://t.me/real_sergeych or email to
+ * real dot sergeych at gmail.
+ */
+
 package net.sergeych.kiloparsec.adapter
 
 import io.ktor.server.application.*
@@ -10,25 +20,42 @@ import kotlinx.coroutines.channels.ClosedReceiveChannelException
 import kotlinx.coroutines.isActive
 import kotlinx.coroutines.launch
 import net.sergeych.crypto2.SigningKey
-import net.sergeych.crypto2.toDump
 import net.sergeych.kiloparsec.KiloInterface
 import net.sergeych.kiloparsec.KiloServerConnection
 import net.sergeych.kiloparsec.RemoteInterface
 import net.sergeych.mp_logger.*
 import net.sergeych.tools.AtomicCounter
-import java.time.Duration
+import kotlin.time.Duration.Companion.seconds
 
+/**
+ * Create a ktor-based websocket server.
+ * This call install Routing and WebSockets with proper configuration.
+ *
+ * The course of action is:
+ *
+ * - create LocalInterface and populate it with functionality
+ * - call this method with localInterface
+ * - optionally, connect the same interface with TCP or UDP providers on supported platforms,
+ * in which case it might be useful to hae session creating function [createSession] separate.
+ *
+ * _Note_: [KiloInterface] as for now does not contain session creation in it as we suggest
+ * session could be transport specific.
+ *
+ * @param localInterface where the actual work is performed.
+ * @param path default http path to the websocket.
+ * @param serverKey optional key to authenticate the connection. If the client specify expected
+ *      server key it should match of connection will not be established.
+ * @param createSession function to create a server session.
+ */
 fun <S> Application.setupWebsocketServer(
     localInterface: KiloInterface<S>,
     path: String = "/kp",
     serverKey: SigningKey? = null,
     createSession: () -> S,
 ) {
-
-    install(Routing)
     install(WebSockets) {
-        pingPeriod = Duration.ofSeconds(15)
-        timeout = Duration.ofSeconds(15)
+        pingPeriod = 60.seconds //Duration.ofSeconds(15)
+        timeout = 45.seconds
         maxFrameSize = Long.MAX_VALUE
         masking = false
     }
@@ -64,12 +91,9 @@ fun <S> Application.setupWebsocketServer(
             }
             log.debug { "KSC started, looking for incoming frames" }
             for (f in incoming) {
-                log.debug { "incoming frame: ${f.frameType}" }
                 if (f is Frame.Binary)
                     try {
-                        input.send(f.readBytes().toUByteArray().also {
-                            log.debug { "in frame\n${it.toDump()}" }
-                        })
+                        input.send(f.readBytes().toUByteArray())
                     } catch (_: RemoteInterface.ClosedException) {
                         log.warning { "caught local closed exception (strange!), closing" }
                         break

src/jvmTest/kotlin/net/sergeych/kiloparsec/ClientTest.kt

@@ -1,8 +1,19 @@
+/*
+ * Copyright (c) 2025. Sergey S. Chernov - All Rights Reserved
+ *
+ *  You may use, distribute and modify this code under the
+ * terms of the private license, which you must obtain from the author
+ *
+ * To obtain the license, contact the author: https://t.me/real_sergeych or email to
+ * real dot sergeych at gmail.
+ */
+
 package net.sergeych.kiloparsec
 
 import assertThrows
 import io.ktor.server.engine.*
 import io.ktor.server.netty.*
+import kotlinx.coroutines.delay
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.test.runTest
 import net.sergeych.crypto2.initCrypto
@@ -10,6 +21,7 @@ import net.sergeych.kiloparsec.adapter.setupWebsocketServer
 import net.sergeych.kiloparsec.adapter.websocketClient
 import net.sergeych.mp_logger.Log
 import java.net.InetAddress
+import kotlin.random.Random
 import kotlin.test.Test
 import kotlin.test.assertEquals
 import kotlin.test.assertFalse
@@ -50,11 +62,12 @@ class ClientTest {
             }
         }
 
-        val ns: NettyApplicationEngine = embeddedServer(Netty, port = 8080, host = "0.0.0.0", module = {
+        val port = Random.nextInt(8080,9090)
+        val ns = embeddedServer(Netty, port = port, host = "0.0.0.0", module = {
             setupWebsocketServer(serverInterface) { Session() }
         }).start(wait = false)
 
-        val client = websocketClient<Unit>("ws://localhost:8080/kp")
+        val client = websocketClient<Unit>("ws://localhost:$port/kp")
         val states = mutableListOf<Boolean>()
         val collector = launch {
             client.connectedStateFlow.collect {
@@ -75,6 +88,9 @@ class ClientTest {
         }
 
         // connection should now be closed
+        // the problem is: it needs some unspecified time to close
+        // as it is async process.
+        delay(100)
         assertFalse { client.connectedStateFlow.value }
 
         // this should be run on automatically reopen connection

src/ktorSocketMain/kotlin/net/sergeych/kiloparsec/adapter/TcpProvider.kt

@@ -1,8 +1,19 @@
+/*
+ * Copyright (c) 2025. Sergey S. Chernov - All Rights Reserved
+ *
+ *  You may use, distribute and modify this code under the
+ * terms of the private license, which you must obtain from the author
+ *
+ * To obtain the license, contact the author: https://t.me/real_sergeych or email to
+ * real dot sergeych at gmail.
+ */
+
 package net.sergeych.kiloparsec.adapter
 
 import io.ktor.network.selector.*
 import io.ktor.network.sockets.*
 import io.ktor.utils.io.*
+import io.ktor.utils.io.writeByte
 import kotlinx.coroutines.*
 import kotlinx.coroutines.CancellationException
 import kotlinx.coroutines.channels.Channel
@@ -12,14 +23,10 @@ import kotlinx.coroutines.flow.flow
 import kotlinx.coroutines.sync.Mutex
 import kotlinx.coroutines.sync.withLock
 import kotlinx.datetime.Clock
-import net.sergeych.kiloparsec.AsyncVarint
-import net.sergeych.kiloparsec.KiloClient
-import net.sergeych.kiloparsec.KiloServer
-import net.sergeych.kiloparsec.LocalInterface
+import net.sergeych.kiloparsec.*
 import net.sergeych.mp_logger.*
 import net.sergeych.mp_tools.globalLaunch
 import net.sergeych.tools.AtomicCounter
-import net.sergeych.tools.AtomicValue
 import kotlin.time.Duration.Companion.seconds
 
 private val logCounter = AtomicCounter(0)
@@ -33,10 +40,10 @@ internal val PING_INACTIVITY_TIME = 30.seconds
  * Listen for incoming TCP/IP connections on all local interfaces and the specified [port]
  * anc create flow of [InetTransportDevice] suitable for [KiloClient].
  */
-fun acceptTcpDevice(port: Int,localInterface: String = "0.0.0.0"): Flow<InetTransportDevice> {
+fun acceptTcpDevice(port: Int, localInterface: String = "0.0.0.0"): Flow<InetTransportDevice> {
     val selectorManager = SelectorManager(Dispatchers.IO)
-    val serverSocket = aSocket(selectorManager).tcp().bind(localInterface, port)
     return flow {
+        val serverSocket = aSocket(selectorManager).tcp().bind(localInterface, port)
         while (true) {
             serverSocket.accept().let { sock ->
                 emit(inetTransportDevice(sock, "srv"))
@@ -74,7 +81,7 @@ private fun inetTransportDevice(
     val outputBlocks = Channel<UByteArray>(4096)
 
     val log = LogTag("TCPT${logCounter.incrementAndGet()}:$suffix:$networkAddress")
-    val job = AtomicValue<Job?>(null)
+    val job = AtomicAsyncValue<Job?>(null)
 
     val sockOutput = sock.openWriteChannel()
     val sockInput = runCatching { sock.openReadChannel() }.getOrElse {
@@ -82,16 +89,16 @@ private fun inetTransportDevice(
         throw IllegalStateException("failed to open read channel")
     }
 
-    fun stop() {
+    suspend fun stop() {
         job.mutate {
-            if ( it != null ) {
+            if (it != null) {
                 log.debug { "stopping" }
                 runCatching { inputBlocks.close() }
                 runCatching { outputBlocks.close() }
                 // The problem: on mac platofrms closing the socket does not close its input
                 // and output channels!
                 runCatching { sockInput.cancel() }
-                runCatching { sockOutput.close() }
+                runCatching { sockOutput.flushAndClose() }
                 if (!sock.isClosed)
                     runCatching {
                         log.debug { "closing socket by stop" }
@@ -108,7 +115,8 @@ private fun inetTransportDevice(
     }
 
     var lastActiveAt = Clock.System.now()
-    job.value = globalLaunch {
+    globalLaunch {
+        job.reset(globalLaunch {
             launch {
 
                 log.debug { "opening read channel" }
@@ -140,14 +148,14 @@ private fun inetTransportDevice(
                     }
                 }
             }
-
+        })
         launch {
             val outAccess = Mutex()
             var lastSentAt = Clock.System.now()
             launch {
                 while (isActive && sock.isActive) {
                     delay(500)
-                    val activityTime = if(lastSentAt > lastActiveAt) lastSentAt else lastActiveAt
+                    val activityTime = if (lastSentAt > lastActiveAt) lastSentAt else lastActiveAt
                     if (Clock.System.now() - activityTime > PING_INACTIVITY_TIME) {
                         log.debug { "pinging for inactivity" }
                         val repeat = outAccess.withLock {

src/ktorSocketMain/kotlin/net/sergeych/kiloparsec/adapter/UdpBlock.kt

@@ -1,7 +1,18 @@
+/*
+ * Copyright (c) 2025. Sergey S. Chernov - All Rights Reserved
+ *
+ *  You may use, distribute and modify this code under the
+ * terms of the private license, which you must obtain from the author
+ *
+ * To obtain the license, contact the author: https://t.me/real_sergeych or email to
+ * real dot sergeych at gmail.
+ */
+
 package net.sergeych.kiloparsec.adapter
 
 import io.ktor.network.sockets.*
 import io.ktor.utils.io.core.*
+import kotlinx.io.readByteArray
 import net.sergeych.crypto2.toDump
 import net.sergeych.kiloparsec.adapter.UdpBlock.Companion.CANCEL_BLOCK
 import net.sergeych.kiloparsec.adapter.UdpBlock.Companion.ESCAPE_BYTE
@@ -97,6 +108,6 @@ sealed class UdpBlock {
         }
 
         fun decode(datagram: Datagram) =
-            decode(datagram.packet.readBytes().toUByteArray())
+            decode(datagram.packet.readByteArray().toUByteArray())
     }
 }

src/ktorSocketMain/kotlin/net/sergeych/kiloparsec/adapter/UdpConnector.kt

@@ -1,3 +1,13 @@
+/*
+ * Copyright (c) 2025. Sergey S. Chernov - All Rights Reserved
+ *
+ *  You may use, distribute and modify this code under the
+ * terms of the private license, which you must obtain from the author
+ *
+ * To obtain the license, contact the author: https://t.me/real_sergeych or email to
+ * real dot sergeych at gmail.
+ */
+
 package net.sergeych.kiloparsec.adapter
 
 import io.ktor.network.sockets.*

src/ktorSocketMain/kotlin/net/sergeych/kiloparsec/adapter/UdpProvider.kt

@@ -1,3 +1,13 @@
+/*
+ * Copyright (c) 2025. Sergey S. Chernov - All Rights Reserved
+ *
+ *  You may use, distribute and modify this code under the
+ * terms of the private license, which you must obtain from the author
+ *
+ * To obtain the license, contact the author: https://t.me/real_sergeych or email to
+ * real dot sergeych at gmail.
+ */
+
 package net.sergeych.kiloparsec.adapter
 
 import io.ktor.network.selector.*
@@ -87,7 +97,7 @@ fun acceptUdpDevice(
  *          the module automatically issues pings on inactivity when there is no data often enough
  *          to maintain the connection open.
  */
-fun connectUdpDevice(
+suspend fun connectUdpDevice(
     hostPort: String,
     maxInactivityTimeout: Duration = 2.minutes,
 ) = connectUdpDevice(hostPort.toNetworkAddress(), maxInactivityTimeout)
@@ -107,16 +117,16 @@ fun connectUdpDevice(
  *          the module automatically issues pings on inactivity when there is no data often enough
  *          to maintain the connection open.
  */
-fun connectUdpDevice(
+suspend fun connectUdpDevice(
     addr: NetworkAddress,
     maxInactivityTimeout: Duration = 2.minutes,
 ): InetTransportDevice {
     val selectorManager = SelectorManager(Dispatchers.IO)
     val remoteAddress = InetSocketAddress(addr.host, addr.port)
-    val socket = aSocket(selectorManager).udp().connect(remoteAddress)
 
     val done = CompletableDeferred<Unit>()
 
+    val socket = aSocket(selectorManager).udp().connect(remoteAddress)
     val transport = UdpSocketTransport(object : UdpConnector {
         override suspend fun sendBlock(block: UdpBlock, toAddress: SocketAddress) {
             socket.send(block.toDatagram(remoteAddress))

src/ktorSocketMain/kotlin/net/sergeych/kiloparsec/adapter/UdpServer.kt

@@ -1,3 +1,13 @@
+/*
+ * Copyright (c) 2025. Sergey S. Chernov - All Rights Reserved
+ *
+ *  You may use, distribute and modify this code under the
+ * terms of the private license, which you must obtain from the author
+ *
+ * To obtain the license, contact the author: https://t.me/real_sergeych or email to
+ * real dot sergeych at gmail.
+ */
+
 package net.sergeych.kiloparsec.adapter
 
 import io.ktor.network.selector.*
@@ -14,6 +24,7 @@ import net.sergeych.mp_logger.LogTag
 import net.sergeych.mp_logger.Loggable
 import net.sergeych.mp_logger.debug
 import net.sergeych.mp_logger.exception
+import net.sergeych.mp_tools.globalDefer
 import kotlin.time.Duration
 import kotlin.time.Duration.Companion.minutes
 
@@ -51,7 +62,9 @@ class UdpServer(val port: Int, localInterface: String = "0.0.0.0", maxInactivity
     private val access = Mutex()
 
     private val selectorManager = SelectorManager(Dispatchers.IO)
-    private val serverSocket = aSocket(selectorManager).udp().bind(InetSocketAddress(localInterface, port))
+    private val serverSocket = globalDefer {
+        aSocket(selectorManager).udp().bind(InetSocketAddress(localInterface, port))
+    }
 
     override suspend fun disconnectClient(address: SocketAddress) {
         access.withLock { sessions.remove(address) }
@@ -65,7 +78,7 @@ class UdpServer(val port: Int, localInterface: String = "0.0.0.0", maxInactivity
         flow {
             while (true) {
                 try {
-                    val datagram = serverSocket.receive()
+                    val datagram = serverSocket.await().receive()
                     val block = UdpBlock.decode(datagram)
                     val remoteAddress = datagram.address
 
@@ -97,10 +110,10 @@ class UdpServer(val port: Int, localInterface: String = "0.0.0.0", maxInactivity
     }
 
     override suspend fun sendBlock(block: UdpBlock, toAddress: SocketAddress) {
-        serverSocket.send(block.toDatagram(toAddress))
+        serverSocket.await().send(block.toDatagram(toAddress))
     }
 
-    val isClosed: Boolean get() = serverSocket.isClosed
+    suspend fun isClosed(): Boolean = serverSocket.await().isClosed
 
     /**
      * Close the UDP server. Calling it will cause:
@@ -113,8 +126,8 @@ class UdpServer(val port: Int, localInterface: String = "0.0.0.0", maxInactivity
      */
     suspend fun close() {
         access.withLock {
-            if (!isClosed) {
-                runCatching { serverSocket.close() }
+            if (!isClosed()) {
+                runCatching { serverSocket.await().close() }
             }
         }
         while (sessions.isNotEmpty()) {

src/ktorSocketMain/kotlin/net/sergeych/kiloparsec/adapter/UdpSocketTransport.kt

@@ -1,3 +1,13 @@
+/*
+ * Copyright (c) 2025. Sergey S. Chernov - All Rights Reserved
+ *
+ *  You may use, distribute and modify this code under the
+ * terms of the private license, which you must obtain from the author
+ *
+ * To obtain the license, contact the author: https://t.me/real_sergeych or email to
+ * real dot sergeych at gmail.
+ */
+
 package net.sergeych.kiloparsec.adapter
 
 import io.ktor.network.sockets.*

src/ktorSocketTest/kotlin/net/sergeych/kiloparsec/adapter/InternetTest.kt

@@ -1,3 +1,13 @@
+/*
+ * Copyright (c) 2025. Sergey S. Chernov - All Rights Reserved
+ *
+ *  You may use, distribute and modify this code under the
+ * terms of the private license, which you must obtain from the author
+ *
+ * To obtain the license, contact the author: https://t.me/real_sergeych or email to
+ * real dot sergeych at gmail.
+ */
+
 package net.sergeych.kiloparsec.adapter
 
 import assertThrows
@@ -10,7 +20,7 @@ import kotlin.test.Test
 import kotlin.test.assertEquals
 import kotlin.test.assertIs
 
-class InternetrTest {
+class InternetTest {
     class TestException : Exception("test1")
 
     @Test
@@ -26,9 +36,11 @@ class InternetrTest {
         val cmdSave by command<String, Unit>()
         val cmdLoad by command<Unit, String>()
         val cmdDrop by command<Unit, Unit>()
+        val cmdPing by command<String, String>()
         val cmdException by command<Unit, Unit>()
+        val cmdCallClient by command<String, String>()
 
-        val cli = KiloInterface<Session>().apply {
+        val serverInterface = KiloInterface<Session>().apply {
             registerError { TestException() }
             onConnected { session.data = "start" }
             on(cmdSave) { session.data = it }
@@ -41,15 +53,26 @@ class InternetrTest {
             on(cmdDrop) {
                 throw LocalInterface.BreakConnectionException()
             }
+            on(cmdCallClient) {
+                remote.call(cmdPing, it)
             }
-        val server = KiloServer(cli, acceptTcpDevice(port)) {
+        }
+        val server = KiloServer(serverInterface, acceptTcpDevice(port)) {
             Session("unknown")
         }
 
-        val client = KiloClient<Unit>() {
-            addErrors(cli)
+        data class LocalSession(val localFoo: String)
+
+        val client = KiloClient {
+            addErrors(serverInterface)
+            session { LocalSession("unknown") }
             // TODO: add register error variant
             connect { connectTcpDevice("localhost:$port") }
+            local {
+                on(cmdPing) {
+                    "pong! $it"
+                }
+            }
         }
 
         assertEquals("start", client.call(cmdLoad))
@@ -65,7 +88,7 @@ class InternetrTest {
 
         // reconnect?
         assertEquals("start", client.call(cmdLoad))
-
+        assertEquals("pong! 42", client.call(cmdCallClient, "42"))
         server.close()
     }