serial_source_add(serial, G_IO_IN, 50, atten_pps3xxx_receive_data, (void *)sdi);
std_session_send_df_header(cb_data, LOG_PREFIX);
serial_source_add(serial, G_IO_IN, 50, atten_pps3xxx_receive_data, (void *)sdi);
std_session_send_df_header(cb_data, LOG_PREFIX);