# Where to see fprintf messages coming from voxl-tflite-server?

Source: https://forum.modalai.com/topic/4188/where-to-see-fprintf-messages-coming-from-voxl-tflite-server
Category: General Questions (https://forum.modalai.com/category/2/general-questions)
Posted: 2025-02-18 16:50:40 UTC by arcj
Replies: 3 · Views: 718

## arcj · 2025-02-18 16:50:40 UTC

I have trained a custom object detection model for VOXL2 and already deployed it using voxl-cross. To test it, I do voxl-configure-tflite and select my custom model to work with high-res camera. 

My custom model is based on mobilenetv2, trained using tflite mediapipe library exactly the way shown here: https://colab.research.google.com/github/googlesamples/mediapipe/blob/main/examples/customization/object_detector.ipynb#scrollTo=Mz3-eHe07FEX

The problem is that my model loads up and shows on the VOXL portal under tflite on multi-view page, but does not draw any bounding boxes around the objects. I'm not sure what's wrong and trying to debug it going through entire tflite source code. I wanted to see the outputs of fprintf(stderr,...) in the source code but not sure how to access that. Any suggestions?

Thanks

## Reply by tom (ModalAI staff) · 2025-02-18 18:27:21 UTC

@arcj voxl-tflite-server is likely running as a systemd service.

For debugging purposes I would disable it from running on boot with the following:

```
systemctl disable voxl-tflite-server
```

and also kill it

```
systemctl stop voxl-tflite-server
```

then run `voxl-tflite-server` from the command line to monitor the output

## Reply by arcj · 2025-02-18 20:58:35 UTC (in reply to tom)

@tom said in [Where to see fprintf messages coming from voxl\-tflite\-server?](/post/20988):
> systemctl stop voxl-tflite-server

Still I can't see the outputs of fprintf(stderr,...)

## Reply by tom (ModalAI staff) · 2025-02-18 21:16:12 UTC (in reply to arcj)

@arcj Try `voxl-tflite-server -d`