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PR #386 did not add the C file to the makefile, causing the build to fail at the link stage due to the missing object file and the symbols that were supposed to be provided by it. Adding the file to the build fixes #472. Reported-by: CarpeNoctem <cryptomax@pm.me> Fixed-by: CarpeNoctem <cryptomax@pm.me> Reviewed-by: Matheus Afonso Martins Moreira <matheus@matheusmoreira.com> GitHub-Issue: https://github.com/joeycastillo/Sensor-Watch/issues/472