Notifications more than 20 bytes

Tue, 2019-09-24 15:40 -- amine_benamor


How can I send a norification that is more than 20 bytes ? I read that it is related to the MTU size and the possible notification length is MTU - 3 

I am using the SW Example: DA1468x BLE customer service as a start for my application and in the ble task there is a code segment where you can change the MTU size. I tried that but still I can only send 20 bytes with a notification.

AES-256-CBC & PKCS7 & OpenSSL

Sun, 2019-09-22 22:01 -- bobspam@free.fr


For the record the AES 256 CBC implementation of DA1463 does not do data padding. PKCS7 must be implemented by software to match other ciphering tools.

By doing so, its implementation matches OpenSSL one and the following command line succesfully decipher data produced by the coprocessor:

openssl enc -aes-256-cbc -d -K "$hex_key" -iv "$hex_iv" -in $msg -out $unciphered (replace $var by your file names)

Best Regards


Fri, 2019-09-20 21:43 -- bobspam@free.fr


I do need to transmit data from a DA14683 using HMAC-AES-256. I found the version in the board support package but it does not produce the same result than what does OpenSSL on the same data (same key & data). I am targeting a data control using : "openssl dgst -binary -hmac key_hex -sha256 -out hmac_file data_file" on a server that collect data.

Can you please confirm to me that this algorithm has been extensively tested ? (I am using it on data and not text)

What is the difference with OpenSSL implementation ?

Thank you in advance

can not broadcast

Thu, 2019-09-19 12:00 -- Ryon


I only change these parameters of dg_configUSE_USB_CHARGER & dg_configUSE_USB in the demo of ble_multi_link.

It can not broadcast when I change the parameter of dg_configUSE_USB_CHARGER & dg_configUSE_USB.

The two parameter are in the file of custom_config_qspi_h,I change as follows:

#define dg_configUSE_USB                                 1//0
#define dg_configUSE_USB_CHARGER                1//0

it can not broadcast now.

do you know why?


Demo: ble_multi_link


DA14681 Wearable kit for voice commands

Tue, 2019-09-17 15:11 -- vivek.vaid@swar...


Since there is a mic on-board the DA14681 Wearable kit, will it be possible for me to port the voice command encoder from Voice RCU software to the wearable kit ? Or will I run into a hardware issue (ex. wrong audio port), or software issue (low memory ? - i can cut other functions of the demo firmware for that hopefully).

Is there an eval kit with voice-command firmware for the new DA1469x devices planned ? (either voice RCU or wearable form factor ?)


Thank you,



Radio frequency interference

Mon, 2019-09-16 03:11 -- 魏文彬

Hi DA team,

Will the DA chip generate RF interference on the 1v8 or p1v8 power supply when Bluetooth is launched?

I found that when I used an external ADC (powered with p1v8) to capture audio data, it would cause the ADC to collect RF noise whenever Bluetooth transmitted data. There is no such noise when Bluetooth is not transmitting. Will it interfere with the P1V8 power supply when Bluetooth sends data? I used the battery to power the DA14682, using an LDO.

How can I solve this RF interference problem?

thanks very much!

Create multiple characteristics in a single BLE Service?

Mon, 2019-09-09 18:54 -- mahmed106

Hi dialog

I want to create multiple characteristics in a single service, right now i am working on pxp reporter and added my custom service from the dialog website tutorial. Its working great, but now i want to add more characteristics but cannot find an example code or tutorial.


Read only characteristic send notification

Mon, 2019-09-09 15:47 -- amine_benamor

Hello Dialog,

I have a system that will communicate with a mobile app through DA14681 BLE device.

This system is equipped with a smartcard reader and I have a read/notify characteristic that handles the smart card status (inserted or not). I need to generate a notification whenever a smart card is inserted knowing that the characteristic value is modified from the DA14681 firmware and not from the moblie application. Can you please guide me on how to do that ? 

Thank you 


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