};
struct culfw_dev *culfw_init(char *device, uint32_t speed, culfw_cb_fn cb, void *data);
-int culfw_send(struct culfw_dev *dev, char *cmd, int cmdlen);
+int culfw_send(struct culfw_dev *dev, const char *cmd, int cmdlen);
int culfw_poll(struct culfw_dev *dev, int timeout);
void culfw_close(struct culfw_dev *dev);
void culfw_flush(struct culfw_dev *dev);