# Send the qr code to register new device
curl -i -F "mac=01:21:33:44:55:66" -F "imageFile=@frame.png" http://rataaa.com/postbox/upload.php

# send the reference image
curl -i -F "mac=01:21:33:44:55:66" -F "battery=40" \
    -F "imageFile=@../python/sample_images/inside_withflash.jpg" http://rataaa.com/postbox/upload.php

# send the image with letter
curl -i -F "mac=01:22:33:44:55:66" -F "battery=40" \
    -F "imageFile=@../python/sample_images/inside_with_letter.jpg" http://rataaa.com/postbox/upload.php