Please send your request to support@springsignage.com, or whomever supplied your Xibo for Android licences. Thanks.
I think you need to reconsider your architecture - it is not advisable to use Xibo for this sort of high-frequency update - it almost sounds like you want a video stream rather than a picture.
You can use the Xibo API to issue a media “edit” and replacement (see Peters excellent Guide: API Introduction with Postman). There is a PHP wrapper for the API which may also be of use: GitHub - xibosignage/oauth2-xibo-cms: Xibo CMS Provider for league/oauth2-client
However, I don’t think your delivery mechanism for this sort of frequency is correct and I would recommend looking at an alternative solution.