Why does automatic discovery fail?

It requires exactly one usable candidate. With multiple devices, run discover_exos() and set an explicit port.

Is name the hardware name?

No. ExoConfig.name is an application-level logical name. ExoDeviceInfo.hardware_name and serial_number are read-only device information.

Why is an IMU or handset missing?

Products and firmware expose different capabilities. Inspect get_device_info().capabilities and components; optional IMU fields may be None.

Why did subscription callbacks stop?

Keep the Subscription alive, start the Exo domain, and make sure a runtime driver is advancing.

Does Exo SDK expose assistance or calibration?

Version 1.0.0 does not expose raw QnTP, firmware/DFU, encoder-zero calibration, wireless provisioning, active assistance, algorithm targets, retargeting, or skeleton APIs.