mudra-sdk 0.2.3

Python SDK for Mudra with native library support

Mudra API Python

Python SDK for Mudra with native library support. This SDK enables you to connect to and interact with Mudra devices via Bluetooth Low Energy (BLE).

For more detailed documentation, visit: https://wearable-devices.github.io/#welcome

Features

• 🔌 Bluetooth Low Energy (BLE) Support - Connect to Mudra devices wirelessly
• 📱 Cross-Platform - Supports Windows, macOS
• 🎯 Device Discovery - Scan and discover nearby Mudra devices
• 📊 Multiple Sensor Data Types - SNC, IMU (Accelerometer/Gyroscope), Pressure, Navigation, Gestures
• 🎮 Firmware Targets - Control where data is sent (App, HID)
• 🤚 Hand Configuration - Set device for left or right hand
• 🔄 Event-Driven Architecture - Use delegates for handling device events
• 🔐 Cloud License Management - Retrieve licenses from cloud

Requirements

• Python 3.7 or higher
• Bluetooth-enabled computer
• Mudra device

Installation

pip install mudra-sdk

Platform Support

The SDK includes native libraries for the following platforms:

• Windows
• macOS

The appropriate library is automatically loaded based on your platform.

API Reference

MudraDelegate Interface

Implement this interface to handle device events:

• on_device_discovered(device: MudraDevice) - Called when a device is discovered
• on_mudra_device_connected(device: MudraDevice) - Called when a device connects
• on_mudra_device_disconnected(device: MudraDevice) - Called when a device disconnects
• on_mudra_device_connecting(device: MudraDevice) - Called when a device is connecting
• on_mudra_device_disconnecting(device: MudraDevice) - Called when a device is disconnecting
• on_mudra_device_connection_failed(device: MudraDevice, error: str) - Called when connection fails
• on_bluetooth_state_changed(state: bool) - Called when Bluetooth state changes

Mudra Class

Main entry point for the SDK.

• set_delegate(delegate: MudraDelegate) - Set the delegate for handling device events
• scan() - Start scanning for Mudra devices (async)
• stop_scan() - Stop scanning for devices (async)

Basic Setup

import asyncio
from mudra_sdk import Mudra, MudraDevice
from mudra_sdk.models.callbacks import MudraDelegate

# Create Mudra instance
mudra = Mudra()

# Implement delegate to handle device events
class MyMudraDelegate(MudraDelegate):
    def on_device_discovered(self, device: MudraDevice):
        print(f"Discovered: {device.name} ({device.address})")

    def on_mudra_device_connected(self, device: MudraDevice):
        print(f"Device connected: {device.name}")

    def on_mudra_device_disconnected(self, device: MudraDevice):
        print(f"Device disconnected: {device.name}")

    def on_mudra_device_connecting(self, device: MudraDevice):
        print(f"Device connecting: {device.name}...")

    def on_mudra_device_disconnecting(self, device: MudraDevice):
        print(f"Device disconnecting: {device.name}...")

    def on_mudra_device_connection_failed(self, device: MudraDevice, error: str):
        print(f"Connection failed: {device.name}, Error: {error}")

    def on_bluetooth_state_changed(self, state: bool):
        print(f"Bluetooth state changed: {'On' if state else 'Off'}")

# Set the delegate
mudra.set_delegate(MyMudraDelegate())

Sign in (required before connecting)

Before connecting to the band, you must sign in via the API to obtain licenses to use the device. Use the cloud client and sign-in request as follows:

from mudra_sdk.cloud import MudraServerClient, SigninRequest

mudra_server_client = MudraServerClient()

signin_request = SigninRequest(
    email="[e-mail]",
    password="your_password",
    platform="your_platform",
    application="your_application",
)
response = mudra_server_client.sign_in_api_call(signin_request.to_json())

After a successful sign-in, you can scan for and connect to the band.

Scanning for Devices

mudra = Mudra()

async def start():
    mudra.set_delegate(MyMudraDelegate())
    
    # Start scanning for Mudra devices
    await mudra.scan()
    
    # Wait for devices to be discovered
    await asyncio.sleep(10)

async def stop():
    # Stop scanning when done
    await mudra.stop_scan()

MudraDevice Class

Represents a discovered or connected Mudra device.

Connection Methods

• connect() - Connect to the device (async)
• disconnect() - Disconnect from the device (async)

Data Feature Callbacks

All data callbacks can be enabled by passing a callback function, or disabled by passing None.

• set_on_snc_ready(callback) - Enable/disable SNC (Sensor Neural Control) data (async)

  • Callback signature: (timestamp: int, data_list: List[float], frequency: int, frequency_std: float, rms_list: List[float]) -> None

• set_on_imu_acc_ready(callback) - Enable/disable IMU Accelerometer data (async)

  • Callback signature: (timestamp: int, data_list: List[float], frequency: int, frequency_std: float, rms_list: List[float]) -> None

• set_on_imu_gyro_ready(callback) - Enable/disable IMU Gyroscope data (async)

  • Callback signature: (timestamp: int, data_list: List[float], frequency: int, frequency_std: float, rms_list: List[float]) -> None

• set_on_pressure_ready(callback, pressure_type: PressureType) - Enable/disable pressure sensing (async)

  • Callback signature: (pressure_data: float) -> None
  • Pressure values range from 0 to 100 (normalized 0–1 in callback)
  • pressure_type: PressureType.direct (continuous hand pressure) or PressureType.pinch (pressure only on tap and press-and-hold; otherwise 0)

• set_on_navigation_axis_ready(callback) - Enable/disable navigation axis (delta) data (async)

  • Callback signature: (delta_x: int, delta_y: int) -> None

• set_on_navigation_direction_ready(callback) - Enable/disable navigation direction (gesture) data (async)

  • Callback signature: (direction: NavigationDirectionGesture) -> None

• set_on_gesture_ready(callback) - Enable/disable gesture recognition (async)

  • Callback signature: (gesture_type: GestureType) -> None

• set_on_button_changed(callback) - Enable/disable Air Touch Button change notifications (async)

  • Callback signature: (air_touch_button: AirMouseButton) -> None

• set_on_charging_state_changed(callback) - Enable/disable charging state change notifications (async)

  • Callback signature: (is_charging: bool) -> None

• set_on_battery_level_changed(callback) - Enable/disable battery level change notifications (async)

  • Callback signature: (level: int) -> None
  • Battery level values range from 0 to 100

Firmware Configuration

• set_firmware_target(target: FirmwareTarget, active: bool) - Enable/disable firmware targets (async)

  • Targets: FirmwareTarget.navigation_to_app, FirmwareTarget.gesture_to_hid, FirmwareTarget.navigation_to_hid

• set_hand(hand_type: HandType) - Set device hand configuration (async)

  • Options: HandType.left, HandType.right

• set_air_touch_active(active: bool) - Enable/disable embedded AirTouch feature (async)

Device Properties

• firmware_status - Access to FirmwareStatus object with current device state
  • Properties include: is_snc_enabled, is_acc_enabled, is_gyro_enabled, is_pressure_enabled, is_pinch_pressure_enabled, is_navigation_enabled, is_gesture_enabled, is_air_touch_enabled, is_sends_navigation_to_app_enabled, is_sends_gesture_to_hid_enabled, is_sends_navigation_to_hid_enabled

Device Information Methods

• get_is_charging() -> bool - Get the current charging state of the device
• get_serial_number() -> Optional[int] - Get the device serial number (returns None if not available)
• get_firmware_version() -> Optional[str] - Get the device firmware version (returns None if not available)

Enums

• FirmwareTarget - Firmware target options: navigation_to_app, gesture_to_hid, navigation_to_hid
• HandType - Hand configuration: left, right
• GestureType - Gesture recognition types
• AirMouseButton - Air Touch Button states
• PressureType - Pressure sensing mode: direct (hand pressure all the time), pinch (pressure only on tap and press-and-hold; otherwise zero)
• NavigationDirectionGesture - Navigation direction gestures (e.g. none, right, left, up, down, roll_left, roll_right, inward, outward, and reverse variants)

Getting Started

Connecting to a Device

# Store discovered devices
discovered_devices = []

class MyMudraDelegate(MudraDelegate):
    def on_device_discovered(self, device: MudraDevice):
        discovered_devices.append(device)
        print(f"Discovered: {device.name}")

async def main():
    mudra = Mudra()
    mudra.set_delegate(MyMudraDelegate())
    
    # Start scanning
    await mudra.scan()
    await asyncio.sleep(5)  # Wait for discovery
    
    # Connect to the first discovered device
    if discovered_devices:
        device = discovered_devices[0]
        await device.connect()
        print(f"Connected to {device.name}")
        
        # ... use the device ...
        
        # Disconnect when done
        await device.disconnect()

asyncio.run(main())

Current Connection Limitation

Important: At the moment, the only supported way to connect to a MudraDevice is by first discovering it via scan(). After your application closes, you must unpair the Mudra device from the operating system’s Bluetooth settings before you can discover and reconnect to it again using scan().
This is a temporary limitation and will be fixed in an upcoming release.

Usage Examples

SNC (Sensor Neural Control) Data

Enable SNC data to receive neural control signals with RMS values.

data_list contains 54 values in total, one block per SNC channel:

• Indices [0–18) → SNC channel 1
• Indices [18–36) → SNC channel 2
• Indices [36–54) → SNC channel 3

Each channel has 18 samples; use these ranges to read per-channel data from data_list.

def on_snc_ready(timestamp: int, data_list: list, frequency: int, frequency_std: float, rms_list: list):
    print(f"SNC - Frequency: {frequency} Hz, RMS: {rms_list}")

async def enable_snc():
    await device.set_on_snc_ready(on_snc_ready)

async def disable_snc():
    await device.set_on_snc_ready(None)

IMU Data (Accelerometer & Gyroscope)

Enable IMU data to receive motion sensor information.

For both accelerometer and gyroscope callbacks, data_list contains 24 values in interleaved order (channel 1, then 2, then 3, repeated 8 times):

• Channel 1 → indices [0, 3, 6, 9, 12, 15, 18, 21]
• Channel 2 → indices [1, 4, 7, 10, 13, 16, 19, 22]
• Channel 3 → indices [2, 5, 8, 11, 14, 17, 20, 23]

To get one channel’s 8 samples in Python:
e.g. channel 1 → [data_list[i] for i in range(0, 24, 3)].

def on_imu_acc_ready(timestamp: int, data_list: list, frequency: int, frequency_std: float, rms_list: list):
    print(f"IMU Acc - Frequency: {frequency:.2f} Hz")

def on_imu_gyro_ready(timestamp: int, data_list: list, frequency: int, frequency_std: float, rms_list: list):
    print(f"IMU Gyro - Frequency: {frequency:.2f} Hz")

async def enable_imu():
    await device.set_on_imu_acc_ready(on_imu_acc_ready)
    await device.set_on_imu_gyro_ready(on_imu_gyro_ready)

async def disable_imu():
    await device.set_on_imu_acc_ready(None)
    await device.set_on_imu_gyro_ready(None)

Pressure Data

Enable pressure sensing to receive real-time pressure data from the device. Pass a PressureType when enabling:

• PressureType.direct – Reports hand pressure continuously (all the time).
• PressureType.pinch – Reports pressure only when the user performs a tap and press-and-hold; otherwise the callback receives zero.

from mudra_sdk.models.enums import PressureType

def on_pressure_ready(pressure_data: float):
    print(f"Pressure: {pressure_data}")  # Normalized 0-1 (or 0-100 depending on firmware)

async def enable_pressure():    
    # Continuous hand pressure
    await device.set_on_pressure_ready(on_pressure_ready, PressureType.direct)
    # Or: only on tap and press-and-hold (otherwise 0)
    # await device.set_on_pressure_ready(on_pressure_ready, PressureType.pinch)

async def disable_pressure():
    await device.set_on_pressure_ready(None)

Navigation Data (Axis and Direction)

Navigation is split into two APIs:

• Navigation Axis – raw cursor deltas (delta_x, delta_y)
• Navigation Direction – discrete direction gestures (NavigationDirectionGesture)

Navigation Axis (deltas)

from mudra_sdk.models.enums import FirmwareTarget

def on_navigation_axis_ready(delta_x: int, delta_y: int):
    print(f"Navigation delta: X={delta_x}, Y={delta_y}")

async def enable_navigation_axis():
    await device.set_firmware_target(FirmwareTarget.navigation_to_app, True)
    await device.set_on_navigation_axis_ready(on_navigation_axis_ready)

async def disable_navigation_axis():
    await device.set_on_navigation_axis_ready(None)
    await device.set_firmware_target(FirmwareTarget.navigation_to_app, False)

Navigation Direction (gestures)

from mudra_sdk.models.enums import NavigationDirectionGesture

def on_navigation_direction_ready(direction: NavigationDirectionGesture):
    print(f"Navigation direction: {direction.description if hasattr(direction, 'description') else direction}")

async def enable_navigation_direction():
    await device.set_firmware_target(FirmwareTarget.navigation_to_app, True)
    await device.set_on_navigation_direction_ready(on_navigation_direction_ready)

async def disable_navigation_direction():
    await device.set_on_navigation_direction_ready(None)
    await device.set_firmware_target(FirmwareTarget.navigation_to_app, False)

Gesture Recognition

Enable gesture recognition to detect hand gestures:

from mudra_sdk.models.enums import GestureType

def on_gesture_ready(gesture_type: GestureType):
    print(f"Gesture detected: {gesture_type}")

async def enable_gesture():
    await device.set_on_gesture_ready(on_gesture_ready)

async def disable_gesture():
    await device.set_on_gesture_ready(None)

Air Touch Button

Monitor Air Touch Button state changes:

from mudra_sdk.models.enums import AirMouseButton

def on_button_changed(air_touch_button: AirMouseButton):
    print(f"Air Touch Button: {air_touch_button}")

async def enable_button_monitoring():
    await device.set_on_button_changed(on_button_changed)

async def disable_button_monitoring():
    await device.set_on_button_changed(None)

Battery Level Monitoring

Monitor battery level changes:

def on_battery_level_changed(level: int):
    print(f"Battery level: {level}%")  # Range: 0-100

async def enable_battery_monitoring():
    await device.set_on_battery_level_changed(on_battery_level_changed)

async def disable_battery_monitoring():
    await device.set_on_battery_level_changed(None)

Charging State Monitoring

Monitor charging state changes:

def on_charging_state_changed(is_charging: bool):
    status = "Charging" if is_charging else "Not charging"
    print(f"Charging state: {status}")

async def enable_charging_monitoring():
    await device.set_on_charging_state_changed(on_charging_state_changed)

async def disable_charging_monitoring():
    await device.set_on_charging_state_changed(None)

Firmware Targets

Control where firmware sends data (to your app or to HID):

from mudra_sdk.models.enums import FirmwareTarget

async def configure_firmware_targets():
    # Enable navigation data to be sent to your app
    await device.set_firmware_target(FirmwareTarget.navigation_to_app, True)
    
    # Enable gesture data to be sent to HID (Human Interface Device)
    await device.set_firmware_target(FirmwareTarget.gesture_to_hid, True)
    
    # Enable navigation data to be sent to HID
    await device.set_firmware_target(FirmwareTarget.navigation_to_hid, True)

async def disable_firmware_targets():
    await device.set_firmware_target(FirmwareTarget.navigation_to_app, False)
    await device.set_firmware_target(FirmwareTarget.gesture_to_hid, False)
    await device.set_firmware_target(FirmwareTarget.navigation_to_hid, False)

Hand Configuration

Set the device for left or right hand:

from mudra_sdk.models.enums import HandType

async def set_hand_configuration():
    # Set for left hand
    await device.set_hand(HandType.left)
    
    # Or set for right hand
    await device.set_hand(HandType.right)

Embedded AirTouch

Enable/disable the embedded AirTouch feature:

async def enable_embedded_airtouch():
    await device.set_air_touch_active(True)

async def disable_embedded_airtouch():
    await device.set_air_touch_active(False)

Device Discovery

Discover GATT services and characteristics on a connected device:

async def discover_device():
    await mudra.ble_service.discover_services_and_characteristics(device)
    print("Device discovery completed")

Checking Device Status

Access the device's firmware status to check which features are enabled:

# After connecting to a device
if device.firmware_status.is_pressure_enabled:
    print("Pressure sensing is enabled")
    
if device.firmware_status.is_pinch_pressure_enabled:
    print("Pinch Pressure sensing is enabled")

if device.firmware_status.is_navigation_enabled:
    print("Navigation is enabled")

if device.firmware_status.is_sends_navigation_to_app_enabled:
    print("Navigation data is being sent to app")

Accessing Device Information

Get device information such as serial number, firmware version, and charging state:

# After connecting to a device
# Get charging state
is_charging = device.get_is_charging()
print(f"Device is charging: {is_charging}")

# Get serial number (may be None if not yet available)
serial_number = device.get_serial_number()
if serial_number is not None:
    print(f"Serial number: {serial_number}")

# Get firmware version (may be None if not yet available)
firmware_version = device.get_firmware_version()
if firmware_version is not None:
    print(f"Firmware version: {firmware_version}")

Support

For issues, questions, or contributions please contact [e-mail]