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Linux/WL1835MOD: How to perform a passive scan of Bluetooth Low Energy using the Bluetopia stack

Thomas Thielemann
Intellectual 420 points
Part Number: WL1835MOD

Tool/software: Linux

Using a HW based on AM335X and WL1835MOD. Operating system is linux.

Bluetopia is  BluetopiaPM-4.2.1.0.1.

External device is a ambient sensor.

Bluetopia stack provides the method DEVM_StartDeviceScan but this is documented as "...Device discovery, in this case, means to perform an active scan of the Bluetooth Low Energy advertising channels." How can I perform a passive scan?

  • 0
    TI__Mastermind 27080 points
    You, can set scan type using the API: HCI_LE_Set_Scan_Parameters()


    BTPSAPI_DECLARATION int BTPSAPI HCI_LE_Set_Scan_Parameters ( unsigned int BluetoothStackID,
    Byte_t LE_Scan_Type,
    Word_t LE_Scan_Interval,
    Word_t LE_Scan_Window,
    Byte_t Own_Address_Type,
    Byte_t Scanning_Filter_Policy,
    Byte_t * StatusResult
    )

    Thanks
  • 0 in reply to Hari Nagalla
    Intellectual 420 points

    Thanks,

    has this command to be issued before every scan? Does this change the settings of other clients in case multiple clients are using the BTPM?

    How do I get the BluetoothStackID?

    Note: Until now I just use the APIs for BTPM, DEVM and GATT.

    Regards

  • 0 in reply to Thomas Thielemann
    TI__Mastermind 27080 points
    It depends how you would like to use it.. Typically, you flow should as below:
    a) set scan params, for ex: HCI_LE_Set_Scan_Parameters(..)
    b) enable scan, for ex: HCI_LE_Set_Scan_Enable()
    c) Wait for the amount of time you need
    d) Disable scan, for ex: HCI_LE_Set_Scan_Enable

    Yes, multiple threads try to access it can mangle the above steps.. From, application you would need to serialize for setting and enabling scans.