PLC4X Kotlin

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>io.re-digital</groupId>
    <artifactId>plc4x-workshop</artifactId>
    <version>1.0-SNAPSHOT</version>

    <properties>
        <kotlin.version>1.6.10</kotlin.version>
        <kotlin.compiler.incremental>true</kotlin.compiler.incremental>
        <junit-jupiter.version>5.8.2</junit-jupiter.version>
        <plc4j.version>0.9.1</plc4j.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.jetbrains.kotlin</groupId>
            <artifactId>kotlin-stdlib</artifactId>
            <version>${kotlin.version}</version>
        </dependency>
        <dependency>
            <groupId>org.jetbrains.kotlin</groupId>
            <artifactId>kotlin-stdlib-jdk8</artifactId>
            <version>${kotlin.version}</version>
        </dependency>
        <dependency>
            <groupId>org.apache.plc4x</groupId>
            <artifactId>plc4j-api</artifactId>
            <version>${plc4j.version}</version>
        </dependency>
        <dependency>
            <groupId>org.apache.plc4x</groupId>
            <artifactId>plc4j-driver-modbus</artifactId>
            <version>${plc4j.version}</version>
            <scope>runtime</scope>
        </dependency>

        <!-- Testing Dependencies -->
        <dependency>
            <groupId>org.assertj</groupId>
            <artifactId>assertj-core</artifactId>
            <version>3.22.0</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.junit.jupiter</groupId>
            <artifactId>junit-jupiter-api</artifactId>
            <version>${junit-jupiter.version}</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.junit.jupiter</groupId>
            <artifactId>junit-jupiter-engine</artifactId>
            <version>${junit-jupiter.version}</version>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.jetbrains.kotlin</groupId>
                <artifactId>kotlin-maven-plugin</artifactId>
                <version>${kotlin.version}</version>
                <executions>
                    <execution>
                        <id>compile</id>
                        <goals>
                            <goal>compile</goal>
                        </goals>
                        <configuration>
                            <sourceDirs>
                                <sourceDir>${project.basedir}/src/main/kotlin</sourceDir>
                                <sourceDir>${project.basedir}/src/main/java</sourceDir>
                            </sourceDirs>
                        </configuration>
                    </execution>
                    <execution>
                        <id>test-compile</id>
                        <goals> <goal>test-compile</goal> </goals>
                        <configuration>
                            <sourceDirs>
                                <sourceDir>${project.basedir}/src/test/kotlin</sourceDir>
                                <sourceDir>${project.basedir}/src/test/java</sourceDir>
                            </sourceDirs>
                        </configuration>
                    </execution>
                </executions>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.5.1</version>
                <executions>
                    <!-- Replacing default-compile as it is treated specially by maven -->
                    <execution>
                        <id>default-compile</id>
                        <phase>none</phase>
                    </execution>
                    <!-- Replacing default-testCompile as it is treated specially by maven -->
                    <execution>
                        <id>default-testCompile</id>
                        <phase>none</phase>
                    </execution>
                    <execution>
                        <id>java-compile</id>
                        <phase>compile</phase>
                        <goals>
                            <goal>compile</goal>
                        </goals>
                    </execution>
                    <execution>
                        <id>java-test-compile</id>
                        <phase>test-compile</phase>
                        <goals>
                            <goal>testCompile</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-assembly-plugin</artifactId>
                <version>2.6</version>
                <executions>
                    <execution>
                        <id>make-assembly</id>
                        <phase>package</phase>
                        <goals> <goal>single</goal> </goals>
                        <configuration>
                            <archive>
                                <manifest>
                                    <mainClass>${main.class}</mainClass>
                                </manifest>
                            </archive>
                            <descriptorRefs>
                                <descriptorRef>jar-with-dependencies</descriptorRef>
                            </descriptorRefs>
                        </configuration>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>
</project>

ReadModbusPal.kt

fun main() {
    PlcDriverManager().getConnection("modbus://localhost:5002").use { conn ->
        if (!conn.metadata.canRead()) {
            println("Cannot read!!")
            return
        }

        val builder = conn.readRequestBuilder()
        builder.addItem("value-1", "coil:1")
        builder.addItem("value-2", "coil:3[4]")
        builder.addItem("value-3", "holding-register:1")
        builder.addItem("value-4", "holding-register:3[4]")
        val readRequest = builder.build()

        val response = readRequest.execute().get()
        for (fieldName in response.fieldNames) {
            if (response.getResponseCode(fieldName) === PlcResponseCode.OK) {
                val numValues = response.getNumberOfValues(fieldName)
                // If it's just one element, output just one single line.
                if (numValues == 1) {
                    println("Value[$fieldName]: ${response.getObject(fieldName)}")
                } else {
                    println("Value[$fieldName]:")
                    for (i in 0 until numValues) {
                        println(" - " + response.getObject(fieldName, i))
                    }
                }
            } else {
                println("Error[$fieldName]: ${response.getResponseCode(fieldName).name}")
            }
        }
    }
    // TODO: find out why it's required
    // without explicitly exiting here, the JVM will remain stuck here
    exitProcess(0)
}