Protobuf Java and Kotlin code generation. (#64)

Co-authored-by: Stian Brandt <stian.brandt@it-smurfan.no>

Makefile

@@ -15,6 +15,9 @@ version:
 	sed -i 's/"version.*/"version": "$(VERSION)",/g' ./api/js/package.json
 	sed -i 's/version.*/version = "$(VERSION)",/g' ./api/python/src/setup.py
 	sed -i 's/^version.*/version = "$(VERSION)"/g' ./api/rust/Cargo.toml
+	sed -i 's/^version.*/version = "$(VERSION)"/g' ./api/java/build.gradle.kts
+	sed -i 's/^version.*/version = "$(VERSION)"/g' ./api/kotlin/build.gradle.kts
+
 	cd api && make
 	make build-ui
 	make test

api/Dockerfile-java

@@ -0,0 +1,7 @@
+FROM amazoncorretto:8
+
+ENV PROJECT_PATH=/chirpstack/api
+RUN yum install -y make git bash
+
+RUN mkdir -p $PROJECT_PATH
+WORKDIR $PROJECT_PATH

api/Dockerfile-kotlin

@@ -0,0 +1,7 @@
+FROM amazoncorretto:8
+
+ENV PROJECT_PATH=/chirpstack/api
+RUN yum install -y make git bash
+
+RUN mkdir -p $PROJECT_PATH
+WORKDIR $PROJECT_PATH

api/Makefile

@@ -1,4 +1,4 @@
-.PHONY: rust grpc-web go js python md
+.PHONY: rust grpc-web go js python md java kotlin
 
 all:
 	docker-compose up
@@ -20,3 +20,9 @@ python:
 
 md:
 	docker-compose run --rm chirpstack-api-md
+
+java:
+	docker-compose run --rm chirpstack-api-java
+
+kotlin:
+	docker-compose run --rm chirpstack-api-kotlin

api/docker-compose.yml

@@ -42,3 +42,17 @@ services:
     command: bash -c "cd md && make all"
     volumes:
       - ./:/chirpstack/api
+  chirpstack-api-java:
+    build:
+      context: .
+      dockerfile: Dockerfile-java
+    command: bash -c "cd java && make all"
+    volumes:
+      - ./:/chirpstack/api
+  chirpstack-api-kotlin:
+    build:
+      context: .
+      dockerfile: Dockerfile-kotlin
+    command: bash -c "cd kotlin && make all"
+    volumes:
+      - ./:/chirpstack/api

api/java/Makefile

@@ -0,0 +1,23 @@
+.PHONY: build
+
+all: clean build jar
+
+clean:
+	@echo "Cleaning..."
+	@./gradlew clean
+	@echo "Clean."
+
+build:
+	@echo "Building..."
+	@./gradlew build
+	@echo "Build complete."
+
+jar: build
+	@echo "Generating jar..."
+	@./gradlew jar
+	@echo "Jar generated in build/libs."
+
+install: build
+	@echo "Installing artifact in local repository..."
+	@./gradlew publishToMavenLocal
+	@echo "Artifact installed in local repository ~/.m2"

api/java/README.md

@@ -0,0 +1,76 @@
+# chirpstack-api
+
+ChirpStack gRPC API message and service wrappers for Java.
+
+## Install
+
+An artifact is not yet public on Maven Central. You can build your own jar with
+
+```sh
+make jar
+```
+
+or install the artifact in your local Maven repository `$HOME/.m2` with
+
+```sh
+make install
+```
+
+## Usage
+
+All messages, services, constants, etc. are auto-generated from the ChirpStack protobuf definitions. The result is that
+this package structure matches that of the protobuf definitions.
+
+The protobuf definitions can be found here: https://github.com/chirpstack/chirpstack/tree/master/api/proto
+
+### Example
+
+#### Maven
+
+```xml
+<dependency>
+  <groupId>io.chirpstack</groupId>
+  <artifactId>chirpstack-api</artifactId>
+  <version>1.0-SNAPSHOT</version>
+</dependency>
+```
+
+#### Gradle
+
+```gradle
+dependencies {
+    implementation("io.chirpstack:chirpstack-api:1.0-SNAPSHOT")
+}
+```
+
+#### Example #1: List tenants
+
+```java
+import io.chirpstack.api.*;
+import io.grpc.ManagedChannel;
+import io.grpc.ManagedChannelBuilder;
+import io.grpc.Metadata;
+import io.grpc.stub.MetadataUtils;
+
+public class ChirpStack {
+    public static void main(String[] args) {
+        ManagedChannel channel = ManagedChannelBuilder
+            .forAddress("localhost", 8080)
+            .usePlaintext()
+            .build();
+        Metadata metadata = new Metadata();
+        Metadata.Key<String> key = Metadata.Key.of("authorization", Metadata.ASCII_STRING_MARSHALLER);
+        String token = "Bearer <INSERT_TOKEN_HERE>";
+        metadata.put(key, token);
+        TenantServiceGrpc.TenantServiceBlockingStub stub = TenantServiceGrpc
+            .newBlockingStub(channel)
+            .withInterceptors(MetadataUtils.newAttachHeadersInterceptor(metadata));
+        ListTenantsRequest request = ListTenantsRequest.newBuilder()
+            .setLimit(10)
+            .build();
+        ListTenantsResponse response = stub.list(request);
+        System.out.println("Number of tenants: " + response.getResultCount());
+    }
+}
+
+```

api/java/build.gradle.kts

@@ -0,0 +1,78 @@
+import com.google.protobuf.gradle.*
+
+plugins {
+    id("java")
+    id("com.google.protobuf") version("0.9.1")
+    `java-library`
+    `maven-publish`
+}
+
+group = "io.chirpstack"
+version = "4.0.4"
+
+repositories {
+    mavenCentral()
+}
+
+buildscript {
+    dependencies {
+        classpath("com.google.protobuf:protobuf-gradle-plugin:0.9.1")
+    }
+}
+
+dependencies {
+    api("io.grpc:grpc-protobuf:1.51.0")
+    api("io.grpc:grpc-api:1.51.0")
+    api("io.grpc:grpc-stub:1.51.0")
+    api("io.grpc:grpc-netty:1.51.0")
+    implementation("javax.annotation:javax.annotation-api:1.3.2")
+}
+
+sourceSets {
+    main {
+        proto {
+            srcDir("$projectDir/../proto")
+        }
+    }
+}
+
+tasks {
+    getByName<Delete>("clean") {
+        delete.add("$projectDir/src/main/grpc")
+        delete.add("$projectDir/src/main/java/internal")
+        delete.add("$projectDir/src/main/java/io")
+    }
+    getByName("processResources") {
+        dependsOn("generateProto")
+    }
+}
+
+protobuf {
+    protoc {
+        artifact = "com.google.protobuf:protoc:3.21.9"
+    }
+    generatedFilesBaseDir = "$projectDir/src"
+    plugins {
+        id("grpc"){
+            artifact = "io.grpc:protoc-gen-grpc-java:1.51.0"
+        }
+    }
+    generateProtoTasks {
+        all().forEach {
+            it.plugins {
+                id("grpc")
+            }
+        }
+    }
+}
+
+publishing {
+    publications {
+        create<MavenPublication>("maven") {
+            groupId = project.group.toString()
+            artifactId = "chirpstack-api"
+            version = project.version.toString()
+            from(components["java"])
+        }
+    }
+}

api/java/gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,5 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.4-bin.zip
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

api/java/gradlew

@@ -0,0 +1,234 @@
+#!/bin/sh
+
+#
+# Copyright © 2015-2021 the original authors.
+#
+# 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
+#
+#      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.
+#
+
+##############################################################################
+#
+#   Gradle start up script for POSIX generated by Gradle.
+#
+#   Important for running:
+#
+#   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
+#       noncompliant, but you have some other compliant shell such as ksh or
+#       bash, then to run this script, type that shell name before the whole
+#       command line, like:
+#
+#           ksh Gradle
+#
+#       Busybox and similar reduced shells will NOT work, because this script
+#       requires all of these POSIX shell features:
+#         * functions;
+#         * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
+#           «${var#prefix}», «${var%suffix}», and «$( cmd )»;
+#         * compound commands having a testable exit status, especially «case»;
+#         * various built-in commands including «command», «set», and «ulimit».
+#
+#   Important for patching:
+#
+#   (2) This script targets any POSIX shell, so it avoids extensions provided
+#       by Bash, Ksh, etc; in particular arrays are avoided.
+#
+#       The "traditional" practice of packing multiple parameters into a
+#       space-separated string is a well documented source of bugs and security
+#       problems, so this is (mostly) avoided, by progressively accumulating
+#       options in "$@", and eventually passing that to Java.
+#
+#       Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
+#       and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
+#       see the in-line comments for details.
+#
+#       There are tweaks for specific operating systems such as AIX, CygWin,
+#       Darwin, MinGW, and NonStop.
+#
+#   (3) This script is generated from the Groovy template
+#       https://github.com/gradle/gradle/blob/master/subprojects/plugins/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       within the Gradle project.
+#
+#       You can find Gradle at https://github.com/gradle/gradle/.
+#
+##############################################################################
+
+# Attempt to set APP_HOME
+
+# Resolve links: $0 may be a link
+app_path=$0
+
+# Need this for daisy-chained symlinks.
+while
+    APP_HOME=${app_path%"${app_path##*/}"}  # leaves a trailing /; empty if no leading path
+    [ -h "$app_path" ]
+do
+    ls=$( ls -ld "$app_path" )
+    link=${ls#*' -> '}
+    case $link in             #(
+      /*)   app_path=$link ;; #(
+      *)    app_path=$APP_HOME$link ;;
+    esac
+done
+
+APP_HOME=$( cd "${APP_HOME:-./}" && pwd -P ) || exit
+
+APP_NAME="Gradle"
+APP_BASE_NAME=${0##*/}
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD=maximum
+
+warn () {
+    echo "$*"
+} >&2
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+} >&2
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "$( uname )" in                #(
+  CYGWIN* )         cygwin=true  ;; #(
+  Darwin* )         darwin=true  ;; #(
+  MSYS* | MINGW* )  msys=true    ;; #(
+  NONSTOP* )        nonstop=true ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD=$JAVA_HOME/jre/sh/java
+    else
+        JAVACMD=$JAVA_HOME/bin/java
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD=java
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
+    case $MAX_FD in #(
+      max*)
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+    esac
+    case $MAX_FD in  #(
+      '' | soft) :;; #(
+      *)
+        ulimit -n "$MAX_FD" ||
+            warn "Could not set maximum file descriptor limit to $MAX_FD"
+    esac
+fi
+
+# Collect all arguments for the java command, stacking in reverse order:
+#   * args from the command line
+#   * the main class name
+#   * -classpath
+#   * -D...appname settings
+#   * --module-path (only if needed)
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if "$cygwin" || "$msys" ; then
+    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
+    CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
+
+    JAVACMD=$( cygpath --unix "$JAVACMD" )
+
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    for arg do
+        if
+            case $arg in                                #(
+              -*)   false ;;                            # don't mess with options #(
+              /?*)  t=${arg#/} t=/${t%%/*}              # looks like a POSIX filepath
+                    [ -e "$t" ] ;;                      #(
+              *)    false ;;
+            esac
+        then
+            arg=$( cygpath --path --ignore --mixed "$arg" )
+        fi
+        # Roll the args list around exactly as many times as the number of
+        # args, so each arg winds up back in the position where it started, but
+        # possibly modified.
+        #
+        # NB: a `for` loop captures its iteration list before it begins, so
+        # changing the positional parameters here affects neither the number of
+        # iterations, nor the values presented in `arg`.
+        shift                   # remove old arg
+        set -- "$@" "$arg"      # push replacement arg
+    done
+fi
+
+# Collect all arguments for the java command;
+#   * $DEFAULT_JVM_OPTS, $JAVA_OPTS, and $GRADLE_OPTS can contain fragments of
+#     shell script including quotes and variable substitutions, so put them in
+#     double quotes to make sure that they get re-expanded; and
+#   * put everything else in single quotes, so that it's not re-expanded.
+
+set -- \
+        "-Dorg.gradle.appname=$APP_BASE_NAME" \
+        -classpath "$CLASSPATH" \
+        org.gradle.wrapper.GradleWrapperMain \
+        "$@"
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+#   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
+#   set -- "${ARGS[@]}" "$@"
+#
+# but POSIX shell has neither arrays nor command substitution, so instead we
+# post-process each arg (as a line of input to sed) to backslash-escape any
+# character that might be a shell metacharacter, then use eval to reverse
+# that process (while maintaining the separation between arguments), and wrap
+# the whole thing up as a single "set" statement.
+#
+# This will of course break if any of these variables contains a newline or
+# an unmatched quote.
+#
+
+eval "set -- $(
+        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
+        xargs -n1 |
+        sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
+        tr '\n' ' '
+    )" '"$@"'
+
+exec "$JAVACMD" "$@"

api/java/gradlew.bat

@@ -0,0 +1,89 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
+@if "%DEBUG%" == "" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%" == "" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if "%ERRORLEVEL%" == "0" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if "%ERRORLEVEL%"=="0" goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+exit /b 1
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega

api/java/settings.gradle.kts

@@ -0,0 +1,2 @@
+rootProject.name = "chirpstack-api"
+

api/kotlin/Makefile

@@ -0,0 +1,23 @@
+.PHONY: build
+
+all: clean build jar
+
+clean:
+	@echo "Cleaning..."
+	@./gradlew clean
+	@echo "Clean."
+
+build:
+	@echo "Building..."
+	@./gradlew build
+	@echo "Build complete."
+
+jar: build
+	@echo "Generating jar..."
+	@./gradlew jar
+	@echo "Jar generated in build/libs."
+
+install: build
+	@echo "Installing artifact in local repository..."
+	@./gradlew publishToMavenLocal
+	@echo "Artifact installed in local repository ~/.m2"

api/kotlin/README.md

@@ -0,0 +1,79 @@
+# chirpstack-api
+
+ChirpStack gRPC API message and service wrappers for Kotlin.
+
+## Install
+
+An artifact is not yet public on Maven Central. You can build your own jar with
+
+```sh
+make jar
+```
+
+or install the artifact in your local Maven repository `$HOME/.m2` with
+
+```sh
+make install
+```
+
+## Usage
+
+All messages, services, constants, etc. are auto-generated from the ChirpStack protobuf definitions. The result is that
+this package structure matches that of the protobuf definitions.
+
+The protobuf definitions can be found here: https://github.com/chirpstack/chirpstack/tree/master/api/proto
+
+### Example
+
+#### Maven
+
+```xml
+<dependency>
+  <groupId>io.chirpstack</groupId>
+  <artifactId>chirpstack-api-kotlin</artifactId>
+  <version>1.0-SNAPSHOT</version>
+</dependency>
+```
+
+#### Gradle
+
+```gradle
+dependencies {
+    implementation("io.chirpstack:chirpstack-api-kotlin:1.0-SNAPSHOT")
+}
+```
+
+#### Example #1: List tenants
+
+Note: To make this example work you will also need to add kotlin coroutines as a dependency
+
+```gradle
+dependencies {
+    implementation("org.jetbrains.kotlinx:kotlinx-coroutines-core:1.6.4")
+}
+```
+
+```kotlin
+import io.chirpstack.api.TenantServiceGrpcKt
+import io.chirpstack.api.listTenantsRequest
+import io.grpc.ManagedChannelBuilder
+import io.grpc.Metadata
+import kotlinx.coroutines.runBlocking
+
+fun main() {
+    val channel = ManagedChannelBuilder
+        .forAddress("localhost", 8080)
+        .usePlaintext()
+        .build()
+    val token = "Bearer <INSERT_TOKEN_HERE>"
+    val metadata = Metadata()
+    val key = Metadata.Key.of("authorization", Metadata.ASCII_STRING_MARSHALLER)
+    metadata.put(key, token)
+    val stub = TenantServiceGrpcKt.TenantServiceCoroutineStub(channel)
+    val request = listTenantsRequest {
+        limit=10
+    }
+    val response = runBlocking { stub.list(request, metadata) }
+    println("Number of tenants: ${response.totalCount}")
+}
+```

api/kotlin/build.gradle.kts

@@ -0,0 +1,100 @@
+import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
+import com.google.protobuf.gradle.*
+
+plugins {
+    kotlin("jvm") version "1.7.21"
+    id("com.google.protobuf") version("0.9.1")
+    `java-library`
+    `maven-publish`
+}
+
+group = "io.chirpstack"
+version = "4.0.4"
+
+repositories {
+    mavenCentral()
+}
+
+kotlin {
+    kotlinDaemonJvmArgs = listOf("-Xmx2048m", "-Xms1024m", "-XX:+UseParallelGC")
+}
+
+buildscript {
+    dependencies {
+        classpath("com.google.protobuf:protobuf-gradle-plugin:0.9.1")
+    }
+}
+
+dependencies {
+    api("io.grpc:grpc-protobuf:1.51.0")
+    api("io.grpc:grpc-netty:1.51.0")
+    api("io.grpc:grpc-kotlin-stub:1.3.0")
+    implementation("com.google.protobuf:protobuf-kotlin:3.21.9")
+    implementation("io.grpc:grpc-api:1.51.0")
+    implementation("io.grpc:grpc-stub:1.51.0")
+    implementation("io.grpc:protoc-gen-grpc-kotlin:1.3.0")
+    implementation("org.jetbrains.kotlinx:kotlinx-coroutines-core:1.6.4")
+}
+
+sourceSets {
+    main {
+        proto {
+            srcDir("$projectDir/../proto")
+        }
+    }
+}
+
+tasks {
+    getByName<Delete>("clean") {
+        delete.add("$projectDir/src/main/grpc")
+        delete.add("$projectDir/src/main/grpckt")
+        delete.add("$projectDir/src/main/java/internal")
+        delete.add("$projectDir/src/main/java/io")
+        delete.add("$projectDir/src/main/kotlin/internal")
+        delete.add("$projectDir/src/main/kotlin/io")
+    }
+    getByName("processResources") {
+        dependsOn("generateProto")
+    }
+}
+
+tasks.withType<KotlinCompile> {
+    kotlinOptions.jvmTarget = JavaVersion.VERSION_1_8.toString()
+}
+
+protobuf {
+    protoc {
+        artifact = "com.google.protobuf:protoc:3.21.9"
+    }
+    generatedFilesBaseDir = "$projectDir/src"
+    plugins {
+        id("grpc"){
+            artifact = "io.grpc:protoc-gen-grpc-java:1.51.0"
+        }
+        id("grpckt") {
+            artifact = "io.grpc:protoc-gen-grpc-kotlin:1.3.0:jdk8@jar"
+        }
+    }
+    generateProtoTasks {
+        all().forEach {
+            it.plugins {
+                id("grpc")
+                id("grpckt")
+            }
+            it.builtins {
+                id("kotlin")
+            }
+        }
+    }
+}
+
+publishing {
+    publications {
+        create<MavenPublication>("maven") {
+            groupId = project.group.toString()
+            artifactId = "chirpstack-api-kotlin"
+            version = project.version.toString()
+            from(components["kotlin"])
+        }
+    }
+}

api/kotlin/gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,5 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.4-bin.zip
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

api/kotlin/gradlew

@@ -0,0 +1,234 @@
+#!/bin/sh
+
+#
+# Copyright © 2015-2021 the original authors.
+#
+# 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
+#
+#      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.
+#
+
+##############################################################################
+#
+#   Gradle start up script for POSIX generated by Gradle.
+#
+#   Important for running:
+#
+#   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
+#       noncompliant, but you have some other compliant shell such as ksh or
+#       bash, then to run this script, type that shell name before the whole
+#       command line, like:
+#
+#           ksh Gradle
+#
+#       Busybox and similar reduced shells will NOT work, because this script
+#       requires all of these POSIX shell features:
+#         * functions;
+#         * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
+#           «${var#prefix}», «${var%suffix}», and «$( cmd )»;
+#         * compound commands having a testable exit status, especially «case»;
+#         * various built-in commands including «command», «set», and «ulimit».
+#
+#   Important for patching:
+#
+#   (2) This script targets any POSIX shell, so it avoids extensions provided
+#       by Bash, Ksh, etc; in particular arrays are avoided.
+#
+#       The "traditional" practice of packing multiple parameters into a
+#       space-separated string is a well documented source of bugs and security
+#       problems, so this is (mostly) avoided, by progressively accumulating
+#       options in "$@", and eventually passing that to Java.
+#
+#       Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
+#       and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
+#       see the in-line comments for details.
+#
+#       There are tweaks for specific operating systems such as AIX, CygWin,
+#       Darwin, MinGW, and NonStop.
+#
+#   (3) This script is generated from the Groovy template
+#       https://github.com/gradle/gradle/blob/master/subprojects/plugins/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       within the Gradle project.
+#
+#       You can find Gradle at https://github.com/gradle/gradle/.
+#
+##############################################################################
+
+# Attempt to set APP_HOME
+
+# Resolve links: $0 may be a link
+app_path=$0
+
+# Need this for daisy-chained symlinks.
+while
+    APP_HOME=${app_path%"${app_path##*/}"}  # leaves a trailing /; empty if no leading path
+    [ -h "$app_path" ]
+do
+    ls=$( ls -ld "$app_path" )
+    link=${ls#*' -> '}
+    case $link in             #(
+      /*)   app_path=$link ;; #(
+      *)    app_path=$APP_HOME$link ;;
+    esac
+done
+
+APP_HOME=$( cd "${APP_HOME:-./}" && pwd -P ) || exit
+
+APP_NAME="Gradle"
+APP_BASE_NAME=${0##*/}
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD=maximum
+
+warn () {
+    echo "$*"
+} >&2
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+} >&2
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "$( uname )" in                #(
+  CYGWIN* )         cygwin=true  ;; #(
+  Darwin* )         darwin=true  ;; #(
+  MSYS* | MINGW* )  msys=true    ;; #(
+  NONSTOP* )        nonstop=true ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD=$JAVA_HOME/jre/sh/java
+    else
+        JAVACMD=$JAVA_HOME/bin/java
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD=java
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
+    case $MAX_FD in #(
+      max*)
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+    esac
+    case $MAX_FD in  #(
+      '' | soft) :;; #(
+      *)
+        ulimit -n "$MAX_FD" ||
+            warn "Could not set maximum file descriptor limit to $MAX_FD"
+    esac
+fi
+
+# Collect all arguments for the java command, stacking in reverse order:
+#   * args from the command line
+#   * the main class name
+#   * -classpath
+#   * -D...appname settings
+#   * --module-path (only if needed)
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if "$cygwin" || "$msys" ; then
+    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
+    CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
+
+    JAVACMD=$( cygpath --unix "$JAVACMD" )
+
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    for arg do
+        if
+            case $arg in                                #(
+              -*)   false ;;                            # don't mess with options #(
+              /?*)  t=${arg#/} t=/${t%%/*}              # looks like a POSIX filepath
+                    [ -e "$t" ] ;;                      #(
+              *)    false ;;
+            esac
+        then
+            arg=$( cygpath --path --ignore --mixed "$arg" )
+        fi
+        # Roll the args list around exactly as many times as the number of
+        # args, so each arg winds up back in the position where it started, but
+        # possibly modified.
+        #
+        # NB: a `for` loop captures its iteration list before it begins, so
+        # changing the positional parameters here affects neither the number of
+        # iterations, nor the values presented in `arg`.
+        shift                   # remove old arg
+        set -- "$@" "$arg"      # push replacement arg
+    done
+fi
+
+# Collect all arguments for the java command;
+#   * $DEFAULT_JVM_OPTS, $JAVA_OPTS, and $GRADLE_OPTS can contain fragments of
+#     shell script including quotes and variable substitutions, so put them in
+#     double quotes to make sure that they get re-expanded; and
+#   * put everything else in single quotes, so that it's not re-expanded.
+
+set -- \
+        "-Dorg.gradle.appname=$APP_BASE_NAME" \
+        -classpath "$CLASSPATH" \
+        org.gradle.wrapper.GradleWrapperMain \
+        "$@"
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+#   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
+#   set -- "${ARGS[@]}" "$@"
+#
+# but POSIX shell has neither arrays nor command substitution, so instead we
+# post-process each arg (as a line of input to sed) to backslash-escape any
+# character that might be a shell metacharacter, then use eval to reverse
+# that process (while maintaining the separation between arguments), and wrap
+# the whole thing up as a single "set" statement.
+#
+# This will of course break if any of these variables contains a newline or
+# an unmatched quote.
+#
+
+eval "set -- $(
+        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
+        xargs -n1 |
+        sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
+        tr '\n' ' '
+    )" '"$@"'
+
+exec "$JAVACMD" "$@"

api/kotlin/gradlew.bat

@@ -0,0 +1,89 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
+@if "%DEBUG%" == "" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%" == "" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if "%ERRORLEVEL%" == "0" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if "%ERRORLEVEL%"=="0" goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+exit /b 1
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega

api/kotlin/settings.gradle.kts

@@ -0,0 +1,2 @@
+rootProject.name = "chirpstack-api"
+

api/proto/integration/integration.proto

@@ -3,7 +3,7 @@ syntax = "proto3";
 package integration;
 
 option go_package = "github.com/brocaar/chirpstack/api/go/v4/integration";
-option java_package = "io.chirpstack.api.as.integration";
+option java_package = "io.chirpstack.api.integration";
 option java_multiple_files = true;
 option java_outer_classname = "IntegrationProto";