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simonvetter / modbus

Go modbus stack (client and server)
MIT License
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client.Close() #24

Closed saimirballeshi closed 1 year ago

saimirballeshi commented 1 year ago

Hello, I'm opening a tcp connection and at the end of execution block I close the connection every time. But after some opening/closing the connection I get dial tcp ip:port: connect: connection refused panic: runtime error: invalid memory address or nil pointer dereference [signal SIGSEGV: segmentation violation code=0x1 addr=0x18 pc=0x5a9ab0]

simonvetter commented 1 year ago

Hi there, the likely cause is that you're attempting to issue modbus requests on a client which failed to connect.

If you skip the Read/Write operations when Open() returns an error and jump right away to the next execution block, does that help ? Now why the target device rejects the TCP connection is another issue entirely... would that device have a limit of active modbus connections ? Or is its modbus task crashing after a couple of Open()/Close() ?

You may want to re-write your code to keep the connection open between executions.

simonvetter commented 1 year ago

Closing this for inactivity. Feel free to reopen if needed.