fun connection(tenant: String, serverInstance: String): CumulocityConnectionFactory.CumulocityConnection
Returns a connection object for the given tenant and instance
tenant - the tenant that you registered with cumulocity e.g. frpresales
serverInstance - the url of the instance to which you want to connect e.g. cumulocity.com
Return
CumulocityConnection an instance that you can use to connect and run the services as shown above