"Incoming bytes do not look like a GRAS message (header='%s' not '%.4s')",
hexa_str((unsigned char *) header, 4, 0), _GRAS_header);
if (header[4] != _GRAS_header[4])
"Incoming bytes do not look like a GRAS message (header='%s' not '%.4s')",
hexa_str((unsigned char *) header, 4, 0), _GRAS_header);
if (header[4] != _GRAS_header[4])