Environment

Avatar SDK: 1.7.3-17 Production
Platform: Ubuntu 22.04, x86_64

Reproduction

1. Plug in the usb receiver.
2. Turn on the right glove. Start a session.
3. Stop the session. Turn off the right glove.
4. Start a new session.
5. Observe that get_device(DeviceType::GLOVE, DeviceSide::RIGHT), init("{}") and start() all can pass.

(before #1218):

[C++] SerialHand::start identity before tactile sn= side=RIGHT serial_open=true
[Avatar] right glove connected and streaming.

Observed behavior

The SDK returns a right-glove device, and both init() and start() succeed even though the glove is powered off.
The serial number is empty, but serial_open=true. No corresponding device is reported for the left glove.

Expected behavior

Either get_device() returns no device when the physical glove is unavailable;
start() reports that the glove is offline; or
the SDK provides a reliable API to distinguish an open serial channel from a glove actively streaming data.

Other

This issue is partially worked-around by #1218. If fixed, consider reverting the workaround.