std_session_send_df_header(cb_data, LOG_PREFIX);
usb_source_add(sdi->session, drvc->sr_ctx, 100,
handle_events, (void *)sdi);
std_session_send_df_header(cb_data, LOG_PREFIX);
usb_source_add(sdi->session, drvc->sr_ctx, 100,
handle_events, (void *)sdi);