[I] [Bug]: modbus over serial port(com) could not closed successfully.

[via GitHub]

liudianwei opened a new issue, #1610:
URL: https://github.com/apache/plc4x/issues/1610

   ### What happened?
   
   modbus over serial port(com) could not closed successfully, try to call 
PlcConnection.close() when com disconnect, it will be in an endless loop. the 
major reason is that it will call channel close by netty automatically when 
shutdown NioEventLoop, and serial channel will put an doClose in eventLoop, it 
will call close again because eventLoopUp is not empty, and than, trapped in a 
dead cycle...
   temp solution:
   close method should only support call once.
   
![image](https://github.com/apache/plc4x/assets/28178193/60296db2-a662-4a4d-94f8-ec3423fb0ca8)
   
![image](https://github.com/apache/plc4x/assets/28178193/9a27019f-fe5c-47d8-a909-6961c095a057)
   
![image](https://github.com/apache/plc4x/assets/28178193/84244ee0-bc0d-4b2e-9832-c886d3b0b24b)
   file location 
plc4x\plc4j\transports\serial\src\main\java\org\apache\plc4x\java\transport\serial
   
   
   ### Version
   
   latest
   
   ### Programming Languages
   
   - [X] plc4j
   - [ ] plc4go
   - [ ] plc4c
   - [ ] plc4net
   
   ### Protocols
   
   - [ ] AB-Ethernet
   - [ ] ADS /AMS
   - [ ] BACnet/IP
   - [ ] CANopen
   - [ ] DeltaV
   - [ ] DF1
   - [ ] EtherNet/IP
   - [ ] Firmata
   - [ ] KNXnet/IP
   - [X] Modbus
   - [ ] OPC-UA
   - [ ] S7


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