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#define _MAX_PROTOCOL_LEN 25
#define _MAX_MODEL_LEN    25
...
   }
   OUTPUT:
       RETVAL

#define _MAX_PROTOCOL_LEN 25
#define _MAX_MODEL_LEN    25
...
   }
   OUTPUT:
       RETVAL

use feature qw( say );

...
      "sensorId: $rec->{id}",
      "dataTypes: $rec->{dataTypes}";
}