Bring your Mocopi trackers into SteamVR!

Built on the battle-tested algorithms and runtime of SlimeVR, this project aims to improve and extend the Mocopi on PC experience. No first-party app required.

Official Support Discord - https://discord.gg/vCQ2xP8KZb

This third-party software is deemed alpha quality, provided as is, and without warranty. Mocopi is a trademark owned by the Sony Corporation. MoSlime is not endorsed by the Sony Corporation nor SlimeVR, nor are they affiliated with the MoSlime developers. This software does not modify the firmware of your Mocopi trackers and should not break them. However, only use this software if you agree to assume the risks therein.

Update: Sony has fixed the issue with the Mocopi firmware and MoSlime can now work on Windows. We are currently working on a rewrite that will support even more devices but in the meantime you can use this rewrite: https://booth.pm/en/items/6524059

In order to use it, you must update the firmware on your trackers to the latest version using the Mocopi app. We are looking into providing firmware updates without having to use a phone.

If you'd like to look into this yourself, you can find the firmware in the Mocopi APK (it ends with a .img extension) and it can be flashed with this: https://play.google.com/store/apps/details?id=com.dialog.suota
Leave all the flash/pin settings as their default. Modifying them might permanently damage your Mocopi.

• Auto-connect to trackers (manual pairing still needed)
• Send IMU rotation data to SlimeVR
• Auto discovery and paring of trackers (Partially complete)
• Auto reconnect when trackers disconnect
• SlimeVR Server auto discovery
• Send IMU acceleration data to SlimeVR (Doesn't help with drift currently, only allows for gesture controls)
• Battery and Firmware version reporting
• UI to allow easy configuration

Setup and usage instructions can be found in the Wiki

With MoSlime, the trackers can be placed and assigned to any body part you want. Assuming you're using MoSlime alongside a VR headset, here are the recommended tracker positions:

• Head - Place on your chest. For some people, the head strap should be big enough to strech over your chest.

• Hip - Should still be used for hip

• Wrists - Use these for your upper legs/knees. You may need to make some custom straps for these (you can use the original mount, just take the 2 screws off the back)

• Ankles - Should still be used for ankles

  • If you're lucky, you might be able to strech the wrist straps around your ankles and your ankle straps around your knees

• Intel 8265NGW - Combo WiFi/BT card
• tp-link UB500
• Raspberry Pi 3B/3B+/4B
• Steam Deck (OLED Version is untested, YMMV)

• Intel 18260NGW - unusable when more than one tracker is connected
• SENA UD100 - has issues connecting to more than 4 trackers

• @lmore377 - Original Bluetooth reverse-engineering work, Python code, quaternion correction math
• @PlatinumVsReality - Slime packet generation code, Rust code, wip web interface, graphics, moral support
• @itstait - Helped optimize multithreading (trust me it used to be much worse)

Special thanks to the SlimeVR team for making their amazing software in the first place and for answering our endless questions!

• https://github.com/lmore377/mocopi-reverse-engineering - Initial reverse engineering work
• https://github.com/SlimeVR/SlimeVR-Tracker-ESP - Used to figure out networking / packet structure
• https://github.com/carl-anders/slimevr-wrangler - Used to figure out networking / packet structure
• https://www.creativefabrica.com/product/coffeecake/ - Font used for the logo. Special thanks to Khurasan!
• https://www.dafont.com/dripping.font - Additional font used, Dripping by Woodcutter