I need a batch command to stop the process and exit immediately when it finds this error

[raspberry109]

I need a batch command to stop the process and exit immediately when it finds this error:

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connection error

the batch works with a certain tool and these are some benchmarks if they help something
The script I own closes the process in these situations and I want someone to help me add a new situation

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:: Controll stopping
:: (1=enable,0=disable;)

and

1'st exit situation:

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:: Check if the file exists
IF NOT EXIST "%filep%" (
   ECHO File "%filep%" was not found. Assuming we ran out.
   ECHO We did not find.
   SET /A errno=%ERROR_NO_MORE_DICTS%
   GOTO END
)

Another exit situation:

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) ELSE (
   :: tool did not run ok. No ideea why. The multitude of checks should have
   :: prevented this.
   ECHO %tool% exited with non-zero exit code. No ideea why. Contact dev.
   SET /A errno=%ERROR_UNKNOWN%
   GOTO END
)

The 3'rd situation:

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:: Call command
%composedcmd%

:: Check if we ran ok
IF /I "%ERRORLEVEL%" EQU "%ERROR_OK%" (
   :: Check if we found mamammia
   FIND "Discovered mamammia" "%tooloutfile%" >NUL 2>&1 && (
      ECHO mamammia.
      GOTO END

I want to add new exit,so when finds this error EXIT:

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connection error

THANK YOU!

[aGerman]

I want to add new exit,so when finds this error EXIT:

Where would it be found? In "%tooloutfile%"?
You may replace FIND with FINDSTR in your third snipped in order to be able to check for several strings at once.

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FINDSTR /c:"Discovered mamammia" /c:"connection error" "%tooloutfile%" >NUL 2>&1 && (

Steffen