Guillermo Hinojosa
Reputation: 31
"Unsupported case for discriminated type" when reading tag from Allen Bradley's Micro820 PLC, using Apache's PLC4X
I’m using Apache’s PLC4X library in order to read some tags from an Allen Bradley’s Micro820 PLC (2080-LC20-20QWB). So far, I am able to establish a connection with the device but when I try to execute a read request I’m getting the error shown in the stack trace bellow.
I’m running a Java maven based project with the following dependencies:
<dependency>
<groupId>org.apache.plc4x</groupId>
<artifactId>plc4j-api</artifactId>
<version>0.9.1</version>
</dependency>
<!-- Ethernet / IP driver -->
<dependency>
<groupId>org.apache.plc4x</groupId>
<artifactId>plc4j-driver-eip</artifactId>
<version>0.9.1</version>
</dependency>
This is the code I'm running on a Ubuntu 18.04 width JDK 11
package com.example.plctest;
import org.apache.plc4x.java.PlcDriverManager;
import org.apache.plc4x.java.api.PlcConnection;
import org.apache.plc4x.java.api.messages.PlcReadRequest;
import org.apache.plc4x.java.api.messages.PlcReadResponse;
import org.apache.plc4x.java.eip.readwrite.field.EipField;
import org.apache.plc4x.java.eip.readwrite.types.CIPDataTypeCode;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class ReadPlcDemo {
private static final Logger LOGGER = LoggerFactory.getLogger(ReadPlcDemo.class);
private static String connectionString = "eip://192.168.1.100?backplane=0&slot=0";
public static void main(String[] args) {
// Establish a connection with the PLC
try (PlcConnection connection = new PlcDriverManager().getConnection(connectionString)) {
if (connection.getMetadata().canRead()) {
LOGGER.info("PLC can read!");
}
// Create the read request
EipField field = new EipField("Sensor1", CIPDataTypeCode.BOOL);
// EipField field = new EipField("Sensor2", CIPDataTypeCode.SINT);
// EipField field = new EipField("Sensor3", CIPDataTypeCode.SINT);
PlcReadRequest.Builder builder = connection.readRequestBuilder();
builder.addItem("value-" + field.getTag(), field);
PlcReadRequest readRequest = builder.build();
// Execute the request
PlcReadResponse response;
try {
response = readRequest.execute().get();
} catch (Exception e) {
e.printStackTrace();
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
This is the result from my stack trace, I set the log level to 'trace' in order to get a better insight of what's going on:
/home/ghinojosa/.jdks/corretto-11.0.14.1/bin/java -Dio.netty.tryReflectionSetAccessible=true --add-opens java.base/jdk.internal.misc=ALL-UNNAMED -javaagent:/home/ghinojosa/.local/share/JetBrains/Toolbox/apps/IDEA-C/ch-0/213.6777.52/lib/idea_rt.jar=44017:/home/ghinojosa/.local/share/JetBrains/Toolbox/apps/IDEA-C/ch-0/213.6777.52/bin -Dfile.encoding=UTF-8 -classpath /home/ghinojosa/IdeaProjects/plc-test/target/classes:/home/ghinojosa/Downloads/eeip-library.jar:/home/ghinojosa/.m2/repository/org/apache/plc4x/plc4j-api/0.9.1/plc4j-api-0.9.1.jar:/home/ghinojosa/.m2/repository/org/apache/commons/commons-lang3/3.12.0/commons-lang3-3.12.0.jar:/home/ghinojosa/.m2/repository/com/fasterxml/jackson/core/jackson-annotations/2.12.5/jackson-annotations-2.12.5.jar:/home/ghinojosa/.m2/repository/org/apache/plc4x/plc4j-driver-eip/0.9.1/plc4j-driver-eip-0.9.1.jar:/home/ghinojosa/.m2/repository/org/apache/plc4x/plc4j-spi/0.9.1/plc4j-spi-0.9.1.jar:/home/ghinojosa/.m2/repository/io/netty/netty-codec/4.1.67.Final/netty-codec-4.1.67.Final.jar:/home/ghinojosa/.m2/repository/io/netty/netty-common/4.1.67.Final/netty-common-4.1.67.Final.jar:/home/ghinojosa/.m2/repository/io/netty/netty-transport/4.1.67.Final/netty-transport-4.1.67.Final.jar:/home/ghinojosa/.m2/repository/io/netty/netty-resolver/4.1.67.Final/netty-resolver-4.1.67.Final.jar:/home/ghinojosa/.m2/repository/commons-beanutils/commons-beanutils/1.9.4/commons-beanutils-1.9.4.jar:/home/ghinojosa/.m2/repository/commons-logging/commons-logging/1.2/commons-logging-1.2.jar:/home/ghinojosa/.m2/repository/commons-collections/commons-collections/3.2.2/commons-collections-3.2.2.jar:/home/ghinojosa/.m2/repository/com/fasterxml/jackson/core/jackson-core/2.12.5/jackson-core-2.12.5.jar:/home/ghinojosa/.m2/repository/com/fasterxml/jackson/core/jackson-databind/2.12.5/jackson-databind-2.12.5.jar:/home/ghinojosa/.m2/repository/io/vavr/vavr/0.10.4/vavr-0.10.4.jar:/home/ghinojosa/.m2/repository/io/vavr/vavr-match/0.10.4/vavr-match-0.10.4.jar:/home/ghinojosa/.m2/repository/com/github/jinahya/bit-io/1.4.3/bit-io-1.4.3.jar:/home/ghinojosa/.m2/repository/commons-codec/commons-codec/1.15/commons-codec-1.15.jar:/home/ghinojosa/.m2/repository/org/apache/plc4x/plc4j-transport-tcp/0.9.1/plc4j-transport-tcp-0.9.1.jar:/home/ghinojosa/.m2/repository/io/netty/netty-buffer/4.1.67.Final/netty-buffer-4.1.67.Final.jar:/home/ghinojosa/.m2/repository/org/slf4j/slf4j-api/1.8.0-beta4/slf4j-api-1.8.0-beta4.jar:/home/ghinojosa/.m2/repository/org/slf4j/slf4j-simple/1.8.0-beta4/slf4j-simple-1.8.0-beta4.jar com.example.plctest.ReadPlcDemo
[main] INFO org.apache.plc4x.java.PlcDriverManager - Instantiating new PLC Driver Manager with class loader jdk.internal.loader.ClassLoaders$AppClassLoader@5c8da962
[main] INFO org.apache.plc4x.java.PlcDriverManager - Registering available drivers...
[main] INFO org.apache.plc4x.java.PlcDriverManager - Registering driver for Protocol eip (EthernetIP)
[main] DEBUG io.netty.util.internal.logging.InternalLoggerFactory - Using SLF4J as the default logging framework
[main] DEBUG io.netty.util.ResourceLeakDetector - -Dio.netty.leakDetection.level: simple
[main] DEBUG io.netty.util.ResourceLeakDetector - -Dio.netty.leakDetection.targetRecords: 4
[main] DEBUG io.netty.util.ResourceLeakDetectorFactory - Loaded default ResourceLeakDetector: io.netty.util.ResourceLeakDetector@4de5031f
[main] DEBUG io.netty.util.internal.PlatformDependent0 - -Dio.netty.noUnsafe: false
[main] DEBUG io.netty.util.internal.PlatformDependent0 - Java version: 11
[main] DEBUG io.netty.util.internal.PlatformDependent0 - sun.misc.Unsafe.theUnsafe: available
[main] DEBUG io.netty.util.internal.PlatformDependent0 - sun.misc.Unsafe.copyMemory: available
[main] DEBUG io.netty.util.internal.PlatformDependent0 - java.nio.Buffer.address: available
WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by io.netty.util.internal.ReflectionUtil (file:/home/ghinojosa/.m2/repository/io/netty/netty-common/4.1.67.Final/netty-common-4.1.67.Final.jar) to constructor java.nio.DirectByteBuffer(long,int)
WARNING: Please consider reporting this to the maintainers of io.netty.util.internal.ReflectionUtil
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release
[main] DEBUG io.netty.util.internal.PlatformDependent0 - direct buffer constructor: available
[main] DEBUG io.netty.util.internal.PlatformDependent0 - java.nio.Bits.unaligned: available, true
[main] DEBUG io.netty.util.internal.PlatformDependent0 - jdk.internal.misc.Unsafe.allocateUninitializedArray(int): available
[main] DEBUG io.netty.util.internal.PlatformDependent0 - java.nio.DirectByteBuffer.<init>(long, int): available
[main] DEBUG io.netty.util.internal.PlatformDependent - sun.misc.Unsafe: available
[main] DEBUG io.netty.util.internal.PlatformDependent - maxDirectMemory: 8390705152 bytes (maybe)
[main] DEBUG io.netty.util.internal.PlatformDependent - -Dio.netty.tmpdir: /tmp (java.io.tmpdir)
[main] DEBUG io.netty.util.internal.PlatformDependent - -Dio.netty.bitMode: 64 (sun.arch.data.model)
[main] DEBUG io.netty.util.internal.PlatformDependent - -Dio.netty.maxDirectMemory: 8390705152 bytes
[main] DEBUG io.netty.util.internal.PlatformDependent - -Dio.netty.uninitializedArrayAllocationThreshold: 1024
[main] DEBUG io.netty.util.internal.CleanerJava9 - java.nio.ByteBuffer.cleaner(): available
[main] DEBUG io.netty.util.internal.PlatformDependent - -Dio.netty.noPreferDirect: false
[main] DEBUG io.netty.util.internal.PlatformDependent - org.jctools-core.MpscChunkedArrayQueue: available
[main] DEBUG io.netty.channel.MultithreadEventLoopGroup - -Dio.netty.eventLoopThreads: 8
[main] DEBUG io.netty.util.internal.InternalThreadLocalMap - -Dio.netty.threadLocalMap.stringBuilder.initialSize: 1024
[main] DEBUG io.netty.util.internal.InternalThreadLocalMap - -Dio.netty.threadLocalMap.stringBuilder.maxSize: 4096
[main] DEBUG io.netty.channel.nio.NioEventLoop - -Dio.netty.noKeySetOptimization: false
[main] DEBUG io.netty.channel.nio.NioEventLoop - -Dio.netty.selectorAutoRebuildThreshold: 512
[main] TRACE io.netty.channel.nio.NioEventLoop - instrumented a special java.util.Set into: sun.nio.ch.EPollSelectorImpl@76505305
[main] TRACE io.netty.channel.nio.NioEventLoop - instrumented a special java.util.Set into: sun.nio.ch.EPollSelectorImpl@7b98f307
[main] TRACE io.netty.channel.nio.NioEventLoop - instrumented a special java.util.Set into: sun.nio.ch.EPollSelectorImpl@4802796d
[main] TRACE io.netty.channel.nio.NioEventLoop - instrumented a special java.util.Set into: sun.nio.ch.EPollSelectorImpl@34123d65
[main] TRACE io.netty.channel.nio.NioEventLoop - instrumented a special java.util.Set into: sun.nio.ch.EPollSelectorImpl@59474f18
[main] TRACE io.netty.channel.nio.NioEventLoop - instrumented a special java.util.Set into: sun.nio.ch.EPollSelectorImpl@65fb9ffc
[main] TRACE io.netty.channel.nio.NioEventLoop - instrumented a special java.util.Set into: sun.nio.ch.EPollSelectorImpl@3e694b3f
[main] TRACE io.netty.channel.nio.NioEventLoop - instrumented a special java.util.Set into: sun.nio.ch.EPollSelectorImpl@1bb5a082
[main] INFO org.apache.plc4x.java.transport.tcp.TcpChannelFactory - Configuring Bootstrap with org.apache.plc4x.java.eip.readwrite.configuration.EIPConfiguration@5aa9e4eb
[main] DEBUG io.netty.channel.DefaultChannelId - -Dio.netty.processId: 10908 (auto-detected)
[main] DEBUG io.netty.util.NetUtil - -Djava.net.preferIPv4Stack: false
[main] DEBUG io.netty.util.NetUtil - -Djava.net.preferIPv6Addresses: false
[main] DEBUG io.netty.util.NetUtilInitializations - Loopback interface: lo (lo, 0:0:0:0:0:0:0:1%lo)
[main] DEBUG io.netty.util.NetUtil - /proc/sys/net/core/somaxconn: 4096
[main] DEBUG io.netty.channel.DefaultChannelId - -Dio.netty.machineId: f4:06:69:ff:fe:d6:97:69 (auto-detected)
[main] DEBUG io.netty.buffer.PooledByteBufAllocator - -Dio.netty.allocator.numHeapArenas: 8
[main] DEBUG io.netty.buffer.PooledByteBufAllocator - -Dio.netty.allocator.numDirectArenas: 8
[main] DEBUG io.netty.buffer.PooledByteBufAllocator - -Dio.netty.allocator.pageSize: 8192
[main] DEBUG io.netty.buffer.PooledByteBufAllocator - -Dio.netty.allocator.maxOrder: 11
[main] DEBUG io.netty.buffer.PooledByteBufAllocator - -Dio.netty.allocator.chunkSize: 16777216
[main] DEBUG io.netty.buffer.PooledByteBufAllocator - -Dio.netty.allocator.smallCacheSize: 256
[main] DEBUG io.netty.buffer.PooledByteBufAllocator - -Dio.netty.allocator.normalCacheSize: 64
[main] DEBUG io.netty.buffer.PooledByteBufAllocator - -Dio.netty.allocator.maxCachedBufferCapacity: 32768
[main] DEBUG io.netty.buffer.PooledByteBufAllocator - -Dio.netty.allocator.cacheTrimInterval: 8192
[main] DEBUG io.netty.buffer.PooledByteBufAllocator - -Dio.netty.allocator.cacheTrimIntervalMillis: 0
[main] DEBUG io.netty.buffer.PooledByteBufAllocator - -Dio.netty.allocator.useCacheForAllThreads: true
[main] DEBUG io.netty.buffer.PooledByteBufAllocator - -Dio.netty.allocator.maxCachedByteBuffersPerChunk: 1023
[main] DEBUG io.netty.buffer.ByteBufUtil - -Dio.netty.allocator.type: pooled
[main] DEBUG io.netty.buffer.ByteBufUtil - -Dio.netty.threadLocalDirectBufferSize: 0
[main] DEBUG io.netty.buffer.ByteBufUtil - -Dio.netty.maxThreadLocalCharBufferSize: 16384
[main] TRACE org.apache.plc4x.java.spi.connection.DefaultNettyPlcConnection - Channel was created, firing ChannelCreated Event
[nioEventLoopGroup-2-1] DEBUG org.apache.plc4x.java.spi.Plc4xNettyWrapper - User Event triggered org.apache.plc4x.java.spi.events.ConnectEvent@645e8927
[nioEventLoopGroup-2-1] DEBUG org.apache.plc4x.java.eip.readwrite.protocol.EipProtocolLogic - Sending RegisterSession EIP Package
[nioEventLoopGroup-2-1] TRACE org.apache.plc4x.java.spi.Plc4xNettyWrapper - Adding Response Handler ...
[nioEventLoopGroup-2-1] TRACE org.apache.plc4x.java.spi.Plc4xNettyWrapper - Sending to wire EipConnectionRequest[sessionHandle=0,status=0,senderContext={0,0,0,0,0,0,0,0},options=0]
[nioEventLoopGroup-2-1] DEBUG org.apache.plc4x.java.spi.Plc4xNettyWrapper - Forwarding request to plc EipConnectionRequest[sessionHandle=0,status=0,senderContext={0,0,0,0,0,0,0,0},options=0]
[nioEventLoopGroup-2-1] DEBUG io.netty.util.Recycler - -Dio.netty.recycler.maxCapacityPerThread: 4096
[nioEventLoopGroup-2-1] DEBUG io.netty.util.Recycler - -Dio.netty.recycler.maxSharedCapacityFactor: 2
[nioEventLoopGroup-2-1] DEBUG io.netty.util.Recycler - -Dio.netty.recycler.linkCapacity: 16
[nioEventLoopGroup-2-1] DEBUG io.netty.util.Recycler - -Dio.netty.recycler.ratio: 8
[nioEventLoopGroup-2-1] DEBUG io.netty.util.Recycler - -Dio.netty.recycler.delayedQueue.ratio: 8
[nioEventLoopGroup-2-1] DEBUG io.netty.buffer.AbstractByteBuf - -Dio.netty.buffer.checkAccessible: true
[nioEventLoopGroup-2-1] DEBUG io.netty.buffer.AbstractByteBuf - -Dio.netty.buffer.checkBounds: true
[nioEventLoopGroup-2-1] DEBUG io.netty.util.ResourceLeakDetectorFactory - Loaded default ResourceLeakDetector: io.netty.util.ResourceLeakDetector@20edcbc7
[nioEventLoopGroup-2-1] DEBUG org.apache.plc4x.java.spi.GeneratedDriverByteToMessageCodec - Sending bytes to PLC for message EipConnectionRequest[sessionHandle=0,status=0,senderContext={0,0,0,0,0,0,0,0},options=0] as data 65000400000000000000000000000000000000000000000001000000
[nioEventLoopGroup-2-1] TRACE org.apache.plc4x.java.spi.GeneratedDriverByteToMessageCodec - Receiving bytes, trying to decode Message...
[nioEventLoopGroup-2-1] TRACE org.apache.plc4x.java.spi.Plc4xNettyWrapper - Decoding EipConnectionRequest[sessionHandle=3604940806,status=0,senderContext={0,0,0,0,0,0,0,0},options=0]
[nioEventLoopGroup-2-1] TRACE org.apache.plc4x.java.spi.Plc4xNettyWrapper - Checking handler HandlerRegistration#0 for Object of type EipConnectionRequest
[nioEventLoopGroup-2-1] TRACE org.apache.plc4x.java.spi.Plc4xNettyWrapper - Handler HandlerRegistration#0 has right expected type EipPacket, checking condition
[nioEventLoopGroup-2-1] TRACE org.apache.plc4x.java.spi.Plc4xNettyWrapper - Handler HandlerRegistration#0 accepts element EipConnectionRequest[sessionHandle=3604940806,status=0,senderContext={0,0,0,0,0,0,0,0},options=0], calling handle method
[nioEventLoopGroup-2-1] DEBUG org.apache.plc4x.java.eip.readwrite.protocol.EipProtocolLogic - Got assigned with Session 3604940806
[nioEventLoopGroup-2-1] TRACE org.apache.plc4x.java.spi.Plc4xNettyWrapper - Firing Connected!
[main] INFO com.example.plctest.ReadPlcDemo - PLC can read!
[main] TRACE org.apache.plc4x.java.spi.transaction.RequestTransactionManager - Submission of transaction 0
[pool-2-thread-1] TRACE org.apache.plc4x.java.spi.transaction.RequestTransactionManager - Start execution of transaction 0
[pool-2-thread-1] TRACE org.apache.plc4x.java.spi.Plc4xNettyWrapper - Adding Response Handler ...
[pool-2-thread-1] TRACE org.apache.plc4x.java.spi.transaction.RequestTransactionManager - Completed execution of transaction 0
[nioEventLoopGroup-2-1] DEBUG org.apache.plc4x.java.spi.Plc4xNettyWrapper - Forwarding request to plc CipRRData[sessionHandle=3604940806,status=0,senderContext={0,0,0,0,0,0,0,0},options=0,exchange=CipExchange[service=CipUnconnectedRequest[unconnectedService=CipReadRequest[RequestPathSize=5,tag={-111,7,83,101,110,115,111,114,49,0},elementNb=1],backPlane=0,slot=0]]]
[nioEventLoopGroup-2-1] DEBUG org.apache.plc4x.java.spi.GeneratedDriverByteToMessageCodec - Sending bytes to PLC for message CipRRData[sessionHandle=3604940806,status=0,senderContext={0,0,0,0,0,0,0,0},options=0,exchange=CipExchange[service=CipUnconnectedRequest[unconnectedService=CipReadRequest[RequestPathSize=5,tag={-111,7,83,101,110,115,111,114,49,0},elementNb=1],backPlane=0,slot=0]]] as data 6f002c000608dfd600000000000000000000000000000000000000000000020000000000b2001c00520220062401059d0e004c05910753656e736f723100010001000000
[nioEventLoopGroup-2-1] TRACE org.apache.plc4x.java.spi.GeneratedDriverByteToMessageCodec - Receiving bytes, trying to decode Message...
[nioEventLoopGroup-2-1] INFO org.apache.plc4x.java.eip.readwrite.io.CipRRDataIO - Expected constant value 0 but got 5 for reserved field.
[nioEventLoopGroup-2-1] WARN org.apache.plc4x.java.spi.GeneratedDriverByteToMessageCodec - Error decoding package with content [6f0016000608dfd600000000000000000000000000000000000000000500020000000000b2000600d20001011103]: Unsupported case for discriminated type
org.apache.plc4x.java.spi.generation.ParseException: Unsupported case for discriminated type
at org.apache.plc4x.java.eip.readwrite.io.CipServiceIO.staticParse(CipServiceIO.java:100)
at org.apache.plc4x.java.eip.readwrite.io.CipExchangeIO.staticParse(CipExchangeIO.java:96)
at org.apache.plc4x.java.eip.readwrite.io.CipRRDataIO.staticParse(CipRRDataIO.java:80)
at org.apache.plc4x.java.eip.readwrite.io.EipPacketIO.staticParse(EipPacketIO.java:101)
at org.apache.plc4x.java.eip.readwrite.io.EipPacketIO.parse(EipPacketIO.java:48)
at org.apache.plc4x.java.eip.readwrite.io.EipPacketIO.parse(EipPacketIO.java:42)
at org.apache.plc4x.java.spi.GeneratedDriverByteToMessageCodec.decode(GeneratedDriverByteToMessageCodec.java:79)
at io.netty.handler.codec.ByteToMessageCodec$1.decode(ByteToMessageCodec.java:42)
at io.netty.handler.codec.ByteToMessageDecoder.decodeRemovalReentryProtection(ByteToMessageDecoder.java:507)
at io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:446)
at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:276)
at io.netty.handler.codec.ByteToMessageCodec.channelRead(ByteToMessageCodec.java:103)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357)
at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1410)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:919)
at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:166)
at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:719)
at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:655)
at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:581)
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:493)
at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:986)
at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
at java.base/java.lang.Thread.run(Thread.java:829)
I'd appreciate any help or if someone could point me in the right direction, in terms of how to solve this. Thanks in advance! Guillermo
Upvotes: 1
Views: 355
Answers (1)
Guillermo Hinojosa
Reputation: 31
For anyone having the same issue: Apparently, from what I've read, the Micro820 series have limitations reading tags. In the case of the PLC I was using (2080-LC20-20QWB) I had to:
- Establish a session by sending a "Forward_Open" request. The details of the request is in page 105 of the CIP specification.
- Once the connection is established, multiple "Read Data" requests can be send with the names of the tags that you wish the read.
- Finally, a "Forward_Close" request is send in order to close the connection.
And that's it.
I cloned this project and implemented the steps that I just described. You can find my version here. And here's an example showing how to use it:
try {
EtherNetIP plc = new EtherNetIP("10.0.1.100", 0);
plc.connectTcp();
List<TagReadReply> tags = plc.connectAndReadTags("Sensor1", "Sensor2" , "Sensor10");
tags.forEach(each -> {
logger.info("Tag name:" + each.getTag() + " is valid ? " + each.isValid());
});
} catch (Exception e) {
e.printStackTrace();
logger.severe("Exception occurred:" + e.getMessage());
}
Upvotes: 1
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