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LUIS ON/OFF

This block controls the LUIS (Local User Interface System) Bluetooth interface. Use it to enable or disable mobile app access to your device for configuration, monitoring, and diagnostics.

LUIS Bluetooth Interface Block

Overview​

The LUIS Bluetooth Interface block enables or disables the LUIS mobile app connection, allowing users to connect via Bluetooth to view variables, modify settings, and access device logs without requiring network connectivity.

Configuration​

  • Action: Choose whether to enable or disable the LUIS interface
    • Enable: Turn on Bluetooth interface for LUIS mobile app
    • Disable: Turn off Bluetooth interface to prevent connections

When to Enable LUIS​

Enable LUIS when:

  • Field technicians need device access
  • Customers require self-service configuration
  • Maintenance and troubleshooting is needed
  • Demo or presentation mode is active
  • No network connectivity is available

When to Disable LUIS​

Disable LUIS for:

  • Enhanced security in production environments
  • Reducing wireless interference
  • Compliance with wireless-restricted areas
  • Preventing unauthorized access

Dynamic Control​

Control LUIS dynamically based on conditions:

Button-Activated​

Enable LUIS when physical button is pressed:

  1. Button Input triggers
  2. Enable LUIS for 10 minutes
  3. Auto-disable after timeout

Security Mode​

Disable LUIS when in secure operating mode:

  1. Check operational mode variable
  2. Disable if "secure" or "production"
  3. Enable only in "maintenance" mode

Conditional Access​

Enable based on authentication:

  1. Require PIN or credential verification
  2. Enable LUIS only after validation
  3. Log access attempts

Use Cases​

Common LUIS control scenarios:

  • Installation Mode: Enable LUIS during device setup and commissioning
  • Maintenance Window: Temporarily enable for scheduled maintenance
  • Emergency Access: Enable LUIS when device is unreachable via network
  • Security Compliance: Disable wireless features in restricted environments
  • Power Saving: Disable when device is battery-powered
  • Authorized Access Only: Enable only when physical button is pressed

Bluetooth Requirements​

LUIS requires:

  • Bluetooth feature enabled in device configuration
  • LUIS mobile app installed on smartphone or tablet
  • Bluetooth pairing (if security is configured)

Mobile App Connection​

Once enabled, users can:

  1. Launch LUIS mobile app
  2. Scan for nearby devices
  3. Select and connect to device
  4. View variables and telemetry
  5. Modify exposed settings
  6. View event logs

See LUIS Mobile App documentation for details.

Settings and Variables​

Control what LUIS can access:

  • Expose settings for mobile configuration
  • Share variables for real-time monitoring
  • Configure access permissions
  • Hide sensitive data from mobile interface

Security Considerations​

When enabling LUIS:

  • Enable Bluetooth pairing for authentication
  • Use PIN codes for additional security
  • Monitor connection logs
  • Implement session timeouts
  • Disable when not actively needed
  • Restrict sensitive settings from exposure

Power Consumption​

LUIS interface affects battery life:

  • Bluetooth radio consumes power when enabled
  • Active connections increase power usage
  • Disable LUIS to extend battery life
  • Consider enabling only on-demand

Integration Flow​

Typical LUIS integration:

1. Device boots
2. Check if maintenance mode
3. If yes, enable LUIS
4. If no, keep LUIS disabled
5. Allow authorized users to temporarily enable
6. Auto-disable after timeout period

Notifications​

Inform users of LUIS state:

  • Update OLED display to show LUIS status
  • Flash LED when LUIS is enabled
  • Send notification when connection established
  • Log LUIS enable/disable events

Troubleshooting​

Common LUIS issues:

  • Cannot connect from app: Verify LUIS is enabled and Bluetooth is on
  • Connection drops: Check Bluetooth range and interference
  • Settings not visible: Ensure settings are properly exposed
  • High power usage: Disable LUIS when not in use

Performance​

LUIS performance considerations:

  • Minimal impact when enabled but not connected
  • Active connections use CPU and memory
  • Large variable lists may slow app responsiveness
  • Limit number of exposed variables for best performance

Comparison with Web Console​

LUIS vs Web Console:

FeatureLUISWeb Console
ConnectionBluetoothWiFi/Ethernet
Internet RequiredNoNo
Range10-30 metersNetwork dependent
Mobile AppYesBrowser
Offline UseFullFull
Setup ComplexityLowMedium

Use both for comprehensive device access options.

See Also​