[jira] [Created] (PLC4X-334) SocketCAN transport disconnections

["Łukasz Dywicki (Jira)" <ji...@apache.org>]

Łukasz Dywicki created PLC4X-334:
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             Summary: SocketCAN transport disconnections
                 Key: PLC4X-334
                 URL: https://issues.apache.org/jira/browse/PLC4X-334
             Project: Apache PLC4X
          Issue Type: Bug
          Components: Driver-CANopen, PLC4J
    Affects Versions: 0.8.0
            Reporter: Łukasz Dywicki
            Assignee: Łukasz Dywicki


SocketCAN transport can silently die due to swallowed exceptions:

{code}
2022-02-16 18:28:11.134 [WARN ] [io.netty.channel.DefaultChannelPipeline] - An exceptionCaught() event was fired, and it reached at the tail of the pipeline. It usually means the last handler in the pipeline did not handle the exception.
tel.schich.javacan.linux.LinuxNativeOperationException: Unable to read from the socket - errorNumber=100, errorMessage='Network is down'
    at tel.schich.javacan.SocketCAN.read(Native Method)
    at tel.schich.javacan.AbstractCanChannel.readSocket(AbstractCanChannel.java:160)
    at tel.schich.javacan.RawCanChannelImpl.readUnsafe(RawCanChannelImpl.java:82) 
    at org.apache.plc4x.java.transport.socketcan.netty.SocketCANChannel.lambda$doConnect$0(SocketCANChannel.java:118)
    at java.lang.Thread.run(Thread.java:834) [?:?]
{code}
This error happened within an hour of application start so its most likely related to some CAN instability, however what's important is lack of proper handling of error. The connection in theory was still alive, however there was no data coming over it any more.



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