Changing DEVICE_MANAGER_MAX_BONDS in device_manager_cnfg.h

[MANGO]

Custom Board with MCU NordicSemi nRF51822-QFAA

• Softdevice S110 7.1

• IAR for ARM 7.1

• SDK 7.2 using a merged service (HID keyboard example + NUS example + HRS example)

• Testing with iPhone 5S, 6 and iPad air (iOS 8.1.3)

  / Nexus 5 and Galaxy Note 3 (Android 4.4.2).

/******************************************************************************************************************/

I want to change DEVICE_MANAGER_MAX_BONDS.

/**
* @brief Maximum bonds that Device Manager should manage.
*
* @details Maximum bonds that Device Manager should manage.
*          Minimum value : 1
*          Maximum value : 254.
*          Dependencies  : None.
* @note In case of GAP Peripheral role, the Device Manager will accept bonding procedure 
*       requests from peers even if this limit is reached, but bonding information will not 
*       be stored. In such cases, application will be notified with DM_DEVICE_CONTEXT_FULL 
*       as event result at the completion of the security procedure.
*/
#define DEVICE_MANAGER_MAX_BONDS         7

As you see, there are no dependencies. So I changed the number to 80.

However, the program fell into assert_error loop before connecting to any centrals.

After the pointer passes here, it returns err_code 7 (NRF_ERROR_INVALID_PARAM).

If I keep use 7 as MAX_BONDS, it is fine though.

What could be the problem?

Regards, Mango922

[Petter Myhre]

Please see this question.

@Mango922: One page is 1024. The size of on bond is 128. 80 bonds will be 80*128 = 10240 which is exactly 10 pages (10240/1024). You can increase the size of each bond to 256 or 512 (since both 1024%256 and 1024%512 is 0), but I don't understand why you would do that.

[MANGO]

Thanks for the link.

In the link, you changed

#define ALL_CONTEXT_SIZE 128

.

I didn't understand clearly.

Why setting this to 128 ensure that a bond are not stored in two separate pages?

Can't I set it to 256 or 512 (since in my case I want to store like 80 bond info)?

--Edited

Oh, you mean

#define BOND_SIZE                  (sizeof(bond_context_t))

this value is 128 ?

You meant since the bond's size is 128, setting to the exact size will ensure that they will be in the

same page? At first, I didn't understand why you set the value to 128.

[Petter Myhre]

ALL_CONTEXT_SIZE is the size that is given to pstorage (param.block_size = ALL_CONTEXT_SIZE;), setting it to 128 ensures no blocks (or bonds) will be split across two pages.

[MANGO]

Before changing ALL_CONTEXT_SIZE, this value was 88.

(DEVICE_CONTEXT_SIZE + SERVICE_CONTEXT_SIZE + APP_CONTEXT_SIZE)

Since, 1024 mod 88 != 0, why did the code worked when I set

DEVICE_MANAGER_MAX_BONDS to 7 and ALL_CONTEXT_SIZE to 88?

[Petter Myhre]

Because 88*7 is 616. It is less than the size of one page.