If for any reason you need to temporarily halt service at your machines (while keeping them paired), you may do so remotely by stopping the Lamassu server process.
To do so, log into the terminal of your DigitalOcean droplet and run the command:
supervisorctl stop lamassu-server
To resume service, run:
supervisorctl start lamassu-server
When stopped, the machine will display a screen reading: 'Sorry, we're down for the moment. Please contact the operator.'