void *cb_data, dev_close_t dev_close_fn,
struct sr_serial_dev_inst *serial, const char *prefix);
SR_PRIV int std_session_send_df_header(const struct sr_dev_inst *sdi,
void *cb_data, dev_close_t dev_close_fn,
struct sr_serial_dev_inst *serial, const char *prefix);
SR_PRIV int std_session_send_df_header(const struct sr_dev_inst *sdi,