static bool elm327_tx_hook(CANPacket_t *to_send) {
  bool tx = true;
  int addr = GET_ADDR(to_send);
  int len = GET_LEN(to_send);

  // All ISO 15765-4 messages must be 8 bytes long
  if (len != 8) {
    tx = false;
  }

  // Check valid 29 bit send addresses for ISO 15765-4
  // Check valid 11 bit send addresses for ISO 15765-4
  if ((addr != 0x18DB33F1) && ((addr & 0x1FFF00FF) != 0x18DA00F1) &&
      ((addr & 0x1FFFFF00) != 0x600) && ((addr & 0x1FFFFF00) != 0x700)) {
    tx = false;
  }
  return tx;
}

// If current_board->has_obd and safety_param == 0, bus 1 is multiplexed to the OBD-II port
const safety_hooks elm327_hooks = {
  .init = nooutput_init,
  .rx = default_rx_hook,
  .tx = elm327_tx_hook,
  .fwd = default_fwd_hook,
};