B4R Question how include Serial1.print in library

Michael1968 said:

Hi,
what is the best way to show log "messages" from library
i need it for debug library function code and want to show the message in the IDE log

adding "serial1.printf("test") in the *.cpp file give me an error ( error: 'serial1' was not declared in this scope)

best regards
Michael

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#include <Arduino.h>

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