//  ui hint is sender only = 0x2n
  uint8_t fbIdx = 0;
  bool active = true;
  uint8_t direction = 2;//bidirectional
  bool sender = true;   //sender only
  bool recv = false;    //
  uint8_t firstGroup = 0;
  uint8_t groupLength = 1;
  uint8_t midiCISupport = 0;
  uint8_t isMIDI1 = 0;
  uint8_t maxS8Streams = 1;

  std::array<uint32_t, 4> mess = UMPMessage::mtFFunctionBlockInfoNotify(fbIdx, active, direction, sender, recv, firstGroup, groupLength, midiCISupport, isMIDI1, maxS8Streams);
  tud_ump_write(BOARD_TUD_RHPORT, mess.data(), mess.size());