The Bluetooth keyboard sample does not work in an IOS 14.3 environment.

[leejuhyuk]

The Bluetooth keyboard sample does not work in an ipad(IOS 14.3)

The development board I used was nrf52840dk_nrf52840 (PCA10056).

I built nRF Connect SDK v1.4.2 through SEGGER Embedded Studio in desktop.

The sources are as follows:
( github.com/.../main.c)
Pairing works well in window10 (Desktop) android (galaxy20) environments, and "hello" messages are sent well when the switch button is pressed.
However, the pairing was successful in the ipad (IOS) environment, but the data failed to transmit.
And if the device is disconnected, pairing on other devices is not possible.

Why doesn't it work normally in IOS?

What else should I do?

I'd really appreciate it if you could answer.

[Carl Richard]

Hello!

Can you try to add the following to your prj.conf: 

CONFIG_BT_GATT_HIDS_DEFAULT_PERM_RW_ENCRYPT=y

This is a known issue in NCS. You can read more about it in this thread.

Best regards,
Carl Richard

[leejuhyuk]

CONFIG_BT_GATT_HIDS_DEFAULT_PERM_RW_ENCRYPT=y

(changed to CONFIG_BT_HIDS_DEFAULT_PERM_ENCRYPT) is already set.
I read the article you sent me, but there is still a problem with data transmission.
Connection between devices is not a problem, but there seems to be a problem with data transfer.
I tested it with ipad (4th generation) and iphone 11pro, but both devices had problems.

[Sunil vignesh]

I am receiving this error

Disconnected from 88:19:08:77:0e:aa (public) (reason 19)
Advertising failed to start (err -12)

when i directly ble off on user device

CONFIG_BT_MAX_CONN=1
CONFIG_BT_MAX_PAIRED=1

CONFIG_BT_HIDS_MAX_CLIENT_COUNT=1

[Carl Richard]

Hello! 

Did you add the configurations described earlier in this thread?

CONFIG_BT_GATT_HIDS_DEFAULT_PERM_RW_ENCRYPT=y
CONFIG_BT_SETTINGS_CCC_STORE_ON_WRITE=y

Error -12 means ENOMEM, which suggests your advertising data may be bigger than the maximum of 31 bytes. Please check this. 

If none of the above helps open a new case, so that we can give you more dedicated help.

Best regards,
Carl Richard

[Sunil vignesh]

Hi carl, Thanks for reply

I have already opened query https://devzone.nordicsemi.com/f/nordic-q-a/77588/advertising-failed-to-start-err--12

but still not getting any response

and i try to

enable this CONFIG_BT_GATT_HIDS_DEFAULT_PERM_RW_ENCRYPT in prj.confg

but the project reload is failed. without this it's working

after changes in prj.confg file i do reload and then runcMake

I am using nrf connect sdk 1.4.2 . SES 5.10d

[Carl Richard]

Hello again!

I'll ping the engineer assigned to your case. And I see now that the configuration option has changed, please try the following instead:

CONFIG_BT_HIDS_DEFAULT_PERM_RW_ENCRYPT=y

Best regards,
Carl Richard

[Sunil vignesh]

Carl Richard said:

I'll ping the engineer assigned to your case

Thank you Carl

[Sunil vignesh]

Hi Carl,

Hope you are fine,

I have a question related to this issue.

As you said i have enabled CONFIG_BT_SETTINGS_CCC_STORE_ON_WRITE=y

so after power cycle the device automatically connects with iphone and the service also works fine

after this

I found that RAM flash memory

gets increase at every disconnect and connect

Example

I connect the device with nrf connect app desktop -> programmer

i read the device and found

flash NVM size  25 bytes from F8000

                          24 bytes from F8FF7.

after connected and paired with iphone 8 plus

flash NVM size  158 bytes from F8000

                          72 bytes from F8FF7.

again read the device

flash NVM size  195 bytes from F8000

                          104 bytes from F8FF7.

I need to work on DFU and also NVM flash storage to store 5KB data. My concern is because of this memory increase . where it get collapse or not

to memories the CCCD where only enable is memorize and disable is not to be memorize is it possible

because

when device is out of bound then it will disconnect at the time memory will increase and then in bound it auto connect and that also write .

i want to control this only write the enable function

[Carl Richard]

Hello!

I'm doing well, thanks! Hope you are fine too. I must ask you to please open a new ticket for this. It's straying away from the initial question, so I think it's better to handle it elsewhere.

Best regards,
Carl Richard

[Sunil vignesh]

Ok, I'm doing well too, I will create new ticket hope i see you soon there.