hand-tracking-sdk 1.0.2

Python SDK for Hand Tracking Streamer telemetry

Python SDK for consuming telemetry from Hand Tracking Streamer (HTS)

Hand Tracking SDK is a Python package for consuming HTS hand-tracking telemetry (UDP/TCP), parsing wrist/landmark data into typed frames, and providing conversion, visualization, and integration-ready APIs.

This SDK is hosted on PyPI, with API documentation Here

Installation

pip install hand-tracking-sdk

Optional visualization support with Rerun:

pip install "hand-tracking-sdk[visualization]"

Quickstart

from hand_tracking_sdk import HTSClient, HTSClientConfig, StreamOutput

client = HTSClient(
    HTSClientConfig(
        output=StreamOutput.BOTH,  # packets + assembled frames
    )
)

for event in client.iter_events():
    print(event)

What HTS Sends

HTS emits UTF-8 CSV lines:

• wrist packet: 7 floats (x, y, z, qx, qy, qz, qw)
• landmarks packet: 63 floats (21 x [x, y, z])

The SDK validates packet labels, hand side, and exact value counts.

Core APIs

• Streaming client:
  • HTSClient, HTSClientConfig
  • output modes: packets, frames, both
  • transport modes: udp, tcp_server, tcp_client
• Frame assembly:
  • HandFrameAssembler
  • emits a frame only when both wrist and landmarks are available
• Coordinate conversion:
  • unity_left_to_right_position
  • unity_left_to_right_quaternion
  • convert_wrist_pose_unity_left_to_right
  • convert_landmarks_unity_left_to_right
  • convert_hand_frame_unity_left_to_right
• Parsing:
  • parse_line

Observability

HTSClient exposes runtime counters and structured log hooks:

• get_stats() / reset_stats()
• ClientStats
• log_hook via HTSClientConfig

ROS2-Friendly Data Model

The SDK is designed so ROS2 adapters can be layered cleanly without a hard ROS dependency:

• explicit timestamps (recv_ts_ns, recv_time_unix_ns, source_ts_ns)
• explicit frame_id and per-side sequencing
• deterministic serialization helpers:
  • WristPose.to_dict() / from_dict()
  • HandLandmarks.to_dict() / from_dict()
  • HandFrame.to_dict() / from_dict()

Frame Structure

A HandFrame includes:

• side: Left or Right
• frame_id: frame name for downstream systems
• wrist: WristPose(x, y, z, qx, qy, qz, qw)
• landmarks.points: tuple of 21 (x, y, z) points
• timing/sequence metadata (sequence_id, recv_ts_ns, recv_time_unix_ns, source_ts_ns)

To get telemetry for a specific joint from a frame, use get_joint(...). Joint names and order follow the HTS streamed contract (wrist is JointName.WRIST).

from hand_tracking_sdk import HTSClient, HTSClientConfig, JointName, StreamOutput

client = HTSClient(HTSClientConfig(output=StreamOutput.FRAMES))

for frame in client.iter_events():
    x, y, z = frame.get_joint(JointName.INDEX_TIP)
    print(
        f"side={frame.side.value} joint={JointName.INDEX_TIP.value} "
        f"xyz=({x:.5f}, {y:.5f}, {z:.5f}) recv_ts_ns={frame.recv_ts_ns}"
    )

You can also query by finger group:

index_points = frame.get_finger("index")
# returns dict[JointName, tuple[float, float, float]]
# keys include JointName.INDEX_PROXIMAL, JointName.INDEX_TIP, ...

Examples

• Rerun visualization:
  • install extra: pip install "hand-tracking-sdk[visualization]"
  • uv run python examples/visualize_rerun.py --transport tcp_server --host 0.0.0.0 --port 8000
• Frame-only stream:
  • uv run python examples/stream_frames.py --transport tcp_server --host 0.0.0.0 --port 8000
• JSONL logging:
  • uv run python examples/log_to_jsonl.py --transport tcp_server --host 0.0.0.0 --port 8000 --output both --path runs/hand_tracking.jsonl

Protocol and Docs

• HTS protocol reference:
  • hand-tracking-streamer/README.md
  • hand-tracking-streamer/CONNECTIONS.md
• SDK docs:
  • https://hand-tracking-sdk.readthedocs.io/

License

Apache-2.0