This is a service which is configured in Monnraker update manager and which allows Karmen developers to install improvements and fixes which will be performed by simply clicking on "update" button.
ssh pi@<your-printer-address>
curl -s https://raw.githubusercontent.com/fragaria/karmen-pws-connector/main/install.sh | sudo bash -s
Replace <your-printer-address> with real ip address of you printer.