The R9250 rear derailleur can pair directly via Bluetooth with Shimano’s E-Tube app on a phone or tablet, for example, allowing for customisation of the groupset from the off.
Per:
Sounds like what you want is already covered (including firmware like the current Di2 wireless setup can do, and the new setup should offer completely stock).
- Once this is installed, you simply charge via the port on the rear derailleur. How is that much different than connecting a charge cable to the pod(s) for the Assioma pedals?