Choosing a trigger
Why does Bluetooth 'connected' not prove a device is next to the PC?
Connected means that a logical link exists; it does not prove an exact physical distance. Walls, the human body, transmit power, power-saving behavior, and radio interference all affect connection state and signal strength.
Each Bluetooth signal represents a different fact
Pairing means the devices established trust before. Connection means a usable logical link currently exists. Advertising means a device is transmitting discovery information. Signal strength represents received radio energy at that moment. None of these alone provides reliable physical distance.
A device behind a wall may remain connected, while headphones next to the PC may sleep and briefly stop activity. Body obstruction, device orientation, battery level, and radio interference can also change signal strength without any movement.
- Paired does not mean currently present
- Connected does not mean very close
- Signal strength is not precise ranging
- Headphone sleep can change connection behavior
Use conservative decisions for privacy triggers
A Bluetooth privacy trigger should not perform a high-impact action because of one state change or one signal reading. A safer approach observes a short sequence of changes, allows brief recovery, and starts with an easily reversible result such as Windows lock.
If Bluetooth remains unstable in the real environment, choose a clearer trigger such as a shortcut, manual protection, or USB removal. The software does not decide what the user is protecting; the user chooses lawful content, triggers, and actions.
- Do not depend on one sample
- Allow confirmation time for brief fluctuations
- Start with reversible protection actions
- Change the trigger when the environment is unstable