Use the Skykit contentId or fallbackContentId to set the desired content or fallback content for the Skykit Media Player for all supplied devices. The Skykit Content GID can be obtained by loading the content in Beam. The url for the content item will contain the ID after the last slash. If access to Beam is not possible please contact Skykit support for the content id. In this request please supply one of contentId or fallbackContentId. A DeviceQuery may contain one collection of deviceIds, serials, labelIds or deviceKeys. Schedule is optional.