Fix for BluetoothGattCallback.onConnectionStateChange being called more than once

    return p_tcb->att_lcid != 0;

  }

  // Already connected, send the callback, mark the link as used

  // Already connected, mark the link as used

  if (gatt_get_ch_state(p_tcb) == GATT_CH_OPEN) {

    /*  very similar to gatt_send_conn_cback, but no good way to reuse the code

     */

    /* notifying application about the connection up event */

    for (int i = 0; i < GATT_MAX_APPS; i++) {

      tGATT_REG* p_reg = &gatt_cb.cl_rcb[i];

      if (!p_reg->in_use || p_reg->gatt_if != gatt_if) continue;

      gatt_update_app_use_link_flag(p_reg->gatt_if, p_tcb, true, true);

      if (p_reg->app_cb.p_conn_cb) {

        uint16_t conn_id = GATT_CREATE_CONN_ID(p_tcb->tcb_idx, p_reg->gatt_if);

        (*p_reg->app_cb.p_conn_cb)(p_reg->gatt_if, p_tcb->peer_bda, conn_id,

                                   true, 0, p_tcb->transport);

      }

    }

    gatt_update_app_use_link_flag(gatt_if, p_tcb, true, true);

    return true;

  }