Ultimaker Buildplate Camera

Use

Login to the CRM (https://makerspaceleiden.nl/crm) and select the 3rd menu option.

Setup

The ultimaker buildplate camera relies on a SSH tunnel provided by the service:

  [Unit]
  Description=Tunnel for the ultimaker camera

After=network.target

[Service] ExecStart=/usr/bin/ssh -i /etc/ultimaker-tunnel -l dirkx -p 222 -T -o ServerAliveInterval=60 -o ExitOnForwardFailure=yes -L 127.0.0.1:9998:192.168.6.12:8080 volmolengracht - RestartSec=30 Restart=always

[Install] WantedBy=multi-user.target

There is an extra tunnel tot port 8080 on the (statich-sh) IP address of the printer; and a 'permit' line for this has been added to the .ssh/authorized keys file on the space-side.

At this port on the Ultimaker; there is a webcam module that accepts two rest calls (AFAIK): ?action=stream en ?action=snapshot. We take the latter to not overload things (and not having to deal with async streaming, etc).

The connection is then reverse proxied by the ultimaker module in our CRM https://github.com/MakerSpaceLeiden/makerspaceleiden-crm. The key config is in views.py:

   def snapshot(request):
      img = requests.get("http://127.0.0.1:9998/?action=snapshot").content
      return HttpResponse(img, content_type="image/jpeg")

With the updating done by a few lines of javascript - see https://github.com/MakerSpaceLeiden/makerspaceleiden-crm -> ultimaker/templates and then index.html