RE: Scanner and advertising options questions

dejans — Wed, 06 Apr 2022 14:09:24 GMT

Hi Glen,

[quote user=""]1) Bluetooth peripheral - when advertising: They wanted a mode where the device will advertise using the 1MBPS phy and then change to whatever PHY a connecting device uses when a connection is established (I'm using NUS once connected). I don't see an option to do this automatically - is this possible?[/quote]

There should be nothing preventing the change of the phy after the connection has been established. bt_conn_get_info gives information from where it is possible to check (info->le->phy) which physical in ON on tx and rx. Additionally, it is possible to update to a different physical after the connection is established using bt_conn_le_phy_update.

[quote user=""]

2) Bluetooth central - when scanning, they want to be able to choose some phy specifics as follows:

a) Scan using the 1 MBPS phy. -- I don't see an option to specify this.

b) Scan using the 2MBPS phy for the "secondary extended advertising portion". -- I'm not sure what that means - does this apply to scanning at all? Maybe they mean the scan response?

c) Scan using the Coded phy -- no problem here - I found the option bit for this, BT_LE_SCAN_OPT_CODED

d) Automatically scan through the various PHY modes. -- I don't think the auto scanning thing is provided by the library - is there any way to do this?

[/quote]

These are available enumerators

enum {

/** Convenience value when no options are specified. */

BT_LE_SCAN_OPT_NONE = 0,

/** Filter duplicates. */

BT_LE_SCAN_OPT_FILTER_DUPLICATE = BIT(0),

/** Filter using filter accept list. */

BT_LE_SCAN_OPT_FILTER_ACCEPT_LIST = BIT(1),

/** Enable scan on coded PHY (Long Range).*/

BT_LE_SCAN_OPT_CODED = BIT(2),

/**

* @brief Disable scan on 1M phy.

* @note Requires @ref BT_LE_SCAN_OPT_CODED.

BT_LE_SCAN_OPT_NO_1M = BIT(3),

};

* @brief Helper macro to enable active scanning to discover new devices.

* Include scanning on Coded PHY in addition to 1M PHY.

#define BT_LE_SCAN_CODED_ACTIVE \

BT_LE_SCAN_PARAM(BT_LE_SCAN_TYPE_ACTIVE, \

BT_LE_SCAN_OPT_CODED | \

BT_LE_SCAN_OPT_FILTER_DUPLICATE, \

BT_GAP_SCAN_FAST_INTERVAL, \

BT_GAP_SCAN_FAST_WINDOW)

There are following Kconfig options
CONFIG_BT_CTLR_PHY_2M=y (2Mbps PHY support in the controller)
CONFIG_BT_CTLR_PHY_CODED=y (coded phy support in the controller)

[quote user=""]3) They want to be able to set which advertising channel the scanner is scanning, 37, 38, or 39. There are options for picking your channel when advertising (BT_LE_ADV_OPT_DISABLE_CHAN_38), but I don't see these options for scanning. Is this possible?[/quote]

It is not possible to set advertising channel which scanner should scan.

Best regards;
Dejan