Pair device address and BT_Characteristic Notify enable disable use unwanted flash space in NCS v1.4.2

[Sunil vignesh]

Hi,

I have develop the Code based on HID_KEYBOARD AND NUS code

here i also need to ADD NVS and DFU to nrf52840 device

1. Pair device address is stored in what manner. I am not able to read and delete the pair data. Is there any document for bond management

2. While using BLE NUS, BATTERY, and Custom service notification enable

I found that some data is writing on the flash . Its like increase the size of the flash . i need to control the unwanted storage . how it is possible

3. I have use storage that to be start F8000 and size is 8000 . is it possible to write and read the data in page wise ( entering direct address to write and read data).

[Sunil vignesh]

Hi Susheel,

Have you check this

[Susheel Nuguru]

This is a custom requirement so you need to change the GATT behavior for it.

Sunil vignesh said:

is it possible to write only CCCD enable to flash storage ?

 You then need to change the gatt.c->bt_gatt_attr_write_ccc and change the below if condition 

	/* Update cfg if don't match */
	if (cfg->value != ccc->value) {
		gatt_ccc_changed(attr, ccc);

#if defined(CONFIG_BT_SETTINGS_CCC_STORE_ON_WRITE)
		gatt_ccc_conn_enqueue(conn);
#endif
	}

to this

	/* Update cfg if don't match */
	if (cfg->value != ccc->value) {
		gatt_ccc_changed(attr, ccc);

#if defined(CONFIG_BT_SETTINGS_CCC_STORE_ON_WRITE)
    if (cfg->value)
		gatt_ccc_conn_enqueue(conn);
#endif
	}

Haven't tested, but i think it should work as you intend it.

[Sunil vignesh]

Sure, I will check this and update you shortly

[Sunil vignesh]

How to enable the required CCCD enable automatically from the device it is . means by default CCCD will be enable when the power is up or after ble connection established .

[Susheel Nuguru]

You cannot set it to enabled by default unless the devices are already bonded and the bonded device previously enabled the CCCD. Changing this behavior in gatt might need more changes than a one liner and I am not sure if it will be in compliance with the spec.