Receiver Mode (BlueRetro) Guide - GrechTech/RetroRosetta GitHub Wiki
V2 Hardware Receiver Quick Start
V1 Hardware Receiver Quick Start
For general use with BlueRetro, check the BlueRetro documentation use here.
For configuring the unit, including remapping, rumble options and much more, check the BlueRetro Web Config user manual here.
For console/system configuration options, including multitap, keyboard, and mouse options, see here BlueRetro System Specific user manual here.