xp7777 opened a new issue, #1452:
URL: https://github.com/apache/plc4x/issues/1452
### What happened?
Hello Sir,
I hope this email finds you well. I am writing to seek assistance regarding
an issue I encountered while using PLC4X version 0.12.0. Following the examples
provided on the official website, I attempted to read the address %I0.2:BOOL.
However, I encountered an error. Could you please advise on the possible
reasons for this error?
Here is the code:
package com.yxp;
import org.apache.plc4x.java.api.PlcConnection;
import org.apache.plc4x.java.api.PlcDriverManager;
import org.apache.plc4x.java.api.messages.PlcReadRequest;
import org.apache.plc4x.java.api.messages.PlcReadResponse;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.concurrent.TimeUnit;
public class plc {
private static final Logger logger = LoggerFactory.getLogger(plc.class);
private static void read() {
String connectionString = "s7://192.168.1.181";
try (PlcConnection plcConnection =
PlcDriverManager.getDefault().getConnectionManager().getConnection(connectionString))
{
// Check if this connection support reading of data.
if (!plcConnection.getMetadata().isReadSupported()) {
logger.error("This connection doesn't support reading.");
return;
}
// Create a new read request:
// - Give the single item requested an alias name
PlcReadRequest.Builder builder =
plcConnection.readRequestBuilder();
builder.addTagAddress("value1","%I0.2:BOOL");
PlcReadRequest readRequest = builder.build();
PlcReadResponse response = readRequest.execute().get(5000,
TimeUnit.MILLISECONDS);
System.out.println(
response.getTagNames()+"---"+response.getResponseCode(response.getTagNames().toString()));
}catch (Exception e){
e.printStackTrace();
}
}
public static void main(String[] args) {
read();
}
}
Error message as follows：
io.netty.handler.codec.DecoderException:
io.netty.handler.codec.EncoderException: MessageToMessageCodec$1 must produce
at least one message.
at
io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:98)
at
io.netty.handler.codec.MessageToMessageCodec.channelRead(MessageToMessageCodec.java:111)
at
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:442)
at
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420)
at
io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:412)
at
io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:103)
at
io.netty.handler.codec.MessageToMessageCodec.channelRead(MessageToMessageCodec.java:111)
at
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:442)
at
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420)
at
io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:412)
at
io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:346)
at
io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:318)
at
io.netty.handler.codec.ByteToMessageCodec.channelRead(ByteToMessageCodec.java:103)
at
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:442)
at
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420)
at
io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:412)
at
io.netty.handler.logging.LoggingHandler.channelRead(LoggingHandler.java:280)
at
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:442)
at
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420)
at
io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:412)
at
org.apache.plc4x.java.s7.readwrite.protocol.S7HMuxImpl.decode(S7HMuxImpl.java:145)
at
org.apache.plc4x.java.s7.readwrite.protocol.S7HMuxImpl.decode(S7HMuxImpl.java:1)
at
io.netty.handler.codec.MessageToMessageCodec$2.decode(MessageToMessageCodec.java:81)
at
io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:88)
at
io.netty.handler.codec.MessageToMessageCodec.channelRead(MessageToMessageCodec.java:111)
at
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:442)
at
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420)
at
io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:412)
at
io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1410)
at
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:440)
at
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420)
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:788)
at
io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:724)
at
io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:650)
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:562)
at
io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:997)
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:834)
Caused by: io.netty.handler.codec.EncoderException: MessageToMessageCodec$1
must produce at least one message.
at
io.netty.handler.codec.MessageToMessageEncoder.write(MessageToMessageEncoder.java:99)
at
io.netty.handler.codec.MessageToMessageCodec.write(MessageToMessageCodec.java:116)
at
io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:891)
at
io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:875)
at
io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:984)
at
io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:868)
at
io.netty.handler.logging.LoggingHandler.write(LoggingHandler.java:288)
at
io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:891)
at
io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:875)
at
io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:984)
at
io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:868)
at
io.netty.handler.codec.MessageToByteEncoder.write(MessageToByteEncoder.java:113)
at
io.netty.handler.codec.ByteToMessageCodec.write(ByteToMessageCodec.java:108)
at
io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:891)
at
io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:875)
at
io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:984)
at
io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:868)
at
io.netty.handler.codec.MessageToMessageEncoder.write(MessageToMessageEncoder.java:113)
at
io.netty.handler.codec.MessageToMessageCodec.write(MessageToMessageCodec.java:116)
at
io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:891)
at
io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:875)
at
io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:984)
at
io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:868)
at
io.netty.handler.codec.MessageToMessageEncoder.write(MessageToMessageEncoder.java:113)
at
io.netty.handler.codec.MessageToMessageCodec.write(MessageToMessageCodec.java:116)
at
io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:891)
at
io.netty.channel.AbstractChannelHandlerContext.invokeWriteAndFlush(AbstractChannelHandlerContext.java:956)
at
io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:982)
at
io.netty.channel.AbstractChannelHandlerContext.writeAndFlush(AbstractChannelHandlerContext.java:950)
at
io.netty.channel.AbstractChannelHandlerContext.writeAndFlush(AbstractChannelHandlerContext.java:1000)
at
io.netty.channel.DefaultChannelPipeline.writeAndFlush(DefaultChannelPipeline.java:1025)
at
io.netty.channel.AbstractChannel.writeAndFlush(AbstractChannel.java:306)
at
org.apache.plc4x.java.spi.internal.DefaultConversationContext.sendToWire(DefaultConversationContext.java:70)
at
org.apache.plc4x.java.spi.internal.DefaultSendRequestContext.handle(DefaultSendRequestContext.java:107)
at
org.apache.plc4x.java.spi.internal.DefaultSendRequestContext.handle(DefaultSendRequestContext.java:1)
at
org.apache.plc4x.java.s7.readwrite.protocol.S7ProtocolLogic.lambda$8(S7ProtocolLogic.java:231)
at
java.base/java.util.function.Consumer.lambda$andThen$0(Consumer.java:65)
at
org.apache.plc4x.java.spi.Plc4xNettyWrapper.decode(Plc4xNettyWrapper.java:183)
at
io.netty.handler.codec.MessageToMessageCodec$2.decode(MessageToMessageCodec.java:81)
at
io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:88)
... 40 more
org.apache.plc4x.java.api.exceptions.PlcInvalidTagException: [value1] invalid
at
org.apache.plc4x.java.spi.messages.DefaultPlcReadResponse.getResponseCode(DefaultPlcReadResponse.java:100)
at com.yxp.plc.read(plc.java:39)
at com.yxp.plc.main(plc.java:49)
Looking forward to your guidance and support.
Could you please advise on the possible reasons for this error and provide
guidance on how to resolve it?
Thank you for your assistance.
Best regards
### Version
0.12.0
### Programming Languages
- [ ] plc4j
- [ ] plc4go
- [ ] plc4c
- [ ] plc4net
### Protocols
- [ ] AB-Ethernet
- [ ] ADS /AMS
- [ ] BACnet/IP
- [ ] CANopen
- [ ] DeltaV
- [ ] DF1
- [ ] EtherNet/IP
- [ ] Firmata
- [ ] KNXnet/IP
- [ ] Modbus
- [ ] OPC-UA
- [X] S7
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