Hi Steven,
the rtsps server and the asc8851a are independent. I assume you are using an i.MX processor with it. If you are generating the i.MX image with Yocto you can use bitbake -s │ gerp rtsps command to find the Yocto package you may need to include this service.
If you are not using i.MX processor please let me know.
Regards,
Carlos
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