PS4 Trainer engine / RTE I no longer work on PS4 so I cannot help but to thoughs still into this scene it might be helpful. this contains source code from multiple developers which includes me, Goldz and DeathRGH

Look here http://ps4trainer.com/

this link may contain information to help you with your development, this was functional the last time i worked on it but things like payloads might have changed since then