Reads the standard output of the VPCS process.
        Only use when the process has been stopped or has crashed.

def read_vpcs_stdout(self):
        """
        Reads the standard output of the VPCS process.
        Only use when the process has been stopped or has crashed.
        """

        output = ""
        if self._vpcs_stdout_file:
            try:
                with open(self._vpcs_stdout_file, "rb") as file:
                    output = file.read().decode("utf-8", errors="replace")
            except OSError as e:
                log.warn("Could not read {}: {}".format(self._vpcs_stdout_file, e))
        return output