You can use the default property to specify a default server in the server-list section. Valid values are true and false.
The following JSON configuration file example shows a default server.
{ "broker_list": { "Value": { "settings": { "server-list": [{ "server": "viewserver0.mydomain.com", "default": true, "description": "View Server 0", "username": "User0", "desktopId": "RDS2012R2DC", "domain": "TestDomain0" }]} } } }