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HCI PSCAN Keeper

These scripts work around the PSCAN state problem with Bluetooth HCI devices on some Linux machines.

Observed on some machines, though the state of a Bluetooth HCI device is set to "UP RUNNING PSCAN" at start-up, it is changed to "UP RUNNING" when the Bluetooth adapter connects or is connected to another Bluetooth device. This problem is found on:

  • Hardware platform: Raspberry Pi Model B
  • Operating system: Raspbian / Linux 3.18.11+
  • Bluetooth daemon: BlueZ 4.99
  • Bluetooth adapter: CSR Bluetooth Dongle (HCI mode) / USB 0a12:0001

This keeper will periodically call hciconfig to scan all HCI devices for their states, and reset the PSCAN state for those who have lost it.

Installation

Copy the ruby script to /home and copy the executatble to /etc/init.d.

If you would like the daemon to start automatically, configure it as you usually do with a Linux service, i.e. update-rc.d hci_pscan_daemon defaults.