UART expect v extract

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Nick Vandehey

• August 25, 2023 20:55

What happens with an 'expect' and 'extract' clause in the same UART command?

I ask in that I'm getting unexpected behaivor. 

With the following test plan:

- ident: FW
  title: Firmware Revision 
  steps:   
  - uartcmd: uart UART0 
    send: 'info fwver\r\n' #needs parsing
    expect: '+RES 0'
    extract: 'VAL val\[(.*)]\r\n'
    extractKey: FWVER
    timeoutms: 20000

And the following UART log:

CLI>info fwver
+VAL val[0.0.5.5]
+RES 1
CLI>

I'm getting a "PASS". This is troubling in that the expected string ("RES 1") didn't come. Can I imply that if the EXTRACT clause is satisified then the EXPECT clause is ignored?

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  Jeremy Wood

  • August 25, 2023 21:32

  To clarify, was that a typo in your comment above, where you said "This is troubling in that the expected string ("RES 1") didn't come". Did you mean that "+RES 0" didn't come?

  I think this may be a limitation of the uart command. Generally the expect value is used before extraction. The idea being, watch the input coming in, go until an expected string is found, then extract a value out.

  Looking into it...

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  Nick Vandehey

  • August 25, 2023 21:46

  Yes. That was indeed a typo. Without "RES 0" in the response, I would think that a response with "RES 1" would fail this step. I think I can proceed with the understanding that 'expect' fields will go ignored if 'extract' is satisfied.

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  Jeremy Wood

  • August 25, 2023 22:01

  You shouldn't rely on this behavior, because I think this is a bug. We don't intend to have this command PASS when expect isn't satisfied.

  My advice with this command at the moment would be to write it something like:

  - ident: FW
    title: Firmware Revision 
    steps:   
    - uartcmd: uart UART0 
      send: 'info fwver\r\n' #needs parsing
      expect: 'VAL val'
      extract: 'VAL val\[(.*)]\r\n'
      extractKey: FWVER
      timeoutms: 20000

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