JoonasC opened a new issue, #1780:
URL: https://github.com/apache/plc4x/issues/1780
### What happened?
It seems like PLC4X does not wait for a response from the Ethernet/IP server
when reading data (specifically using the Ethernet/IP scanner device in
Beckhoff Twincat3 PLCs)
I'm using the following code to test reading:
```java
public class Main {
public static void main(String[] args) {
String connectionString = "eip://10.50.100.216:44818?bigEndian=false";
try (PlcConnection plcConnection =
PlcDriverManager.getDefault().getConnectionManager().getConnection(connectionString))
{
PlcReadRequest.Builder readBuilder =
plcConnection.readRequestBuilder();
readBuilder.addTagAddress("Var1", "%Var1");
PlcReadRequest readRequest = readBuilder.build();
System.out.println("--- Reading data ---");
PlcReadResponse readResponse = readRequest.execute().get();
System.out.println("--- Read complete ---");
System.out.println(readResponse.getResponseCode("Var1"));
System.out.println(readResponse.getObject("Var1"));
} catch (Exception e) {
System.out.println("Connection failed");
e.printStackTrace();
}
}
}
```
Stacktrace:
> org.apache.plc4x.java.api.exceptions.PlcInvalidTagException: Var1 invalid
> at
org.apache.plc4x.java.spi.messages.DefaultPlcReadResponse.getResponseCode(DefaultPlcReadResponse.java:100)
> at org.example.Main.main(Main.java:20)
Looking at Wireshark, PLC4X closes the connection before the PLC has a
chance to respond to the read request:
[Capture.pcapng.gz](https://github.com/user-attachments/files/17098250/Capture.pcapng.gz)
I can workaround this bug by adding a manual `Thread.sleep` before trying to
interact with the read response object:
```java
System.out.println("--- Reading data ---");
PlcReadResponse readResponse = readRequest.execute().get();
Thread.sleep(1000);
System.out.println("--- Read complete ---");
```
Here is my Twincat3 Ethernet/IP explicit messaging configuration:
### Version
0.12.0
### Programming Languages
- [X] plc4j
- [ ] plc4go
- [ ] plc4c
- [ ] plc4net
### Protocols
- [ ] AB-Ethernet
- [ ] ADS /AMS
- [ ] BACnet/IP
- [ ] CANopen
- [ ] DeltaV
- [ ] DF1
- [X] EtherNet/IP
- [ ] Firmata
- [ ] KNXnet/IP
- [ ] Modbus
- [ ] OPC-UA
- [ ] S7
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