Prusa Connect Webcam upload

README.md

From Nunos great instructions

Instructions

1. Go to the Cameras section at https://connect.prusa3d.com
2. Add a new camera.
3. Click the QR code link
4. Click "Start Camera"
5. Open your browser's inspector window and look for the "/snapshot" request.
6. Copy the "Fingerprint" and "Token" headers into the file below.
7. Save prusaconnect_upload_cam.sh from below to /usr/local/bin/prusaconnect_upload_cam.sh and make it executable chmod +x /usr/local/bin/prusaconnect_upload_cam.sh.

Service

To run in the background, create /etc/systemd/system/prusaconnect_upload_cam.service and then start and enable it: systemctl enable --now prusaconnect_upload_cam.service.

prusaconnect_upload_cam.service

[Unit]
Description=Raspi Camera to Prusa Connect

[Service]
ExecStart=/usr/local/bin/prusaconnect_upload_cam.sh

[Install]
WantedBy=multi-user.target

prusaconnect_upload_cam.sh

#!/bin/bash

# Set default values for environment variables
: "${HTTP_URL:=https://webcam.connect.prusa3d.com/c/snapshot}"
: "${DELAY_SECONDS:=10}"
: "${LONG_DELAY_SECONDS:=60}"
: "${FINGERPRINT:=<fingerprint>}"
: "${TOKEN:=<token>}"

while true; do
    # Delete the previous image since libcamera-jpeg won't overwrite
    rm -f /tmp/prusa_output.jpg 2> /dev/null

    # Grab a frame from the Raspi Camera
    libcamera-jpeg -o /tmp/prusa_output.jpg -q 80 --width 800 --height 600 -n

    # If no error, upload it.
    if [ $? -eq 0 ]; then
        # POST the image to the HTTP URL using curl
        curl -X PUT "$HTTP_URL" \
            -H "accept: */*" \
            -H "content-type: image/jpg" \
            -H "fingerprint: $FINGERPRINT" \
            -H "token: $TOKEN" \
            --data-binary "@/tmp/prusa_output.jpg" \
            --no-progress-meter \
            --compressed

        # Reset delay to the normal value
        DELAY=$DELAY_SECONDS
    else
        echo "libcamera-jpeg returned an error. Retrying after ${LONG_DELAY_SECONDS}s..."

        # Set delay to the longer value
        DELAY=$LONG_DELAY_SECONDS
    fi

    sleep "$DELAY"
done

Works like a charm (with fswebcam), thank you! Btw - Fingerprint can be any value between 16 and 64 chars, more info here: falkorichter/prusa-connect-api#2

As a small addition: With a ping to the printer you can check if the printer is online and avoid unnecessary traffic during offline time:

if ping -c 1 $PRINTER_IP &> /dev/null