Transmitting large data (NRF5340 Audio DK)

[pal_722]

Hi,

I am currently working on creating a Custom Profile, and have used Peripheral Sample code. I tweaked the code and was able to send 512 bytes of data on 8 different characteristics each, but when i tried to send 1024 bytes and 2048 bytes, I loose data. 

I want to send 1024 bytes or more (basically 2's power data) of data for my Application.
Can someone help me with this?

Thank you 
Regards
Pallavi

[Susheel Nuguru]

Can you please give us more details on how exactly you are trying to send 1024 and 2048 bytes of data, and what do you mean by losing data? the data never appears in the application? BLE is an acknowledge based protocol, so it means that the data is received by the controller and mostly the host, it is most of the time application corner cases, where data is lost. If you give more specific details and probably some code snippets demonstrating what you are trying to do, then we can attempt to assist you.

[pal_722]

Hi Susheel Nuguru , Thanks for the reply.

Susheel Nuguru said:

the data never appears in the application?

Yes. I do not receive the data in the app. 

i am trying to send VND_MAX_LEN number of 1's to each characteristic.

I had used the existing Peripheral sample code to customize my application. 
Please let me know if you need any further details.

Thank you!
Regards
Pallavi

[Elfving]

Hi again Pollavi, 

Susheel is currently out of office, so I will take care of this case in the meantime. 

I just want to start off with some questions to clear things up for me. 

Could you tell me what peripheral sample you used? And my understanding is that you are using normal BLE for this, not LE Audio, is that correct?

Regards,

Elfving

[pal_722]

Hi Elfving 

Elfving said:

Susheel is currently out of office, so I will take care of this case in the meantime. 

Ok.

Elfving said:

Could you tell me what peripheral sample you used?

i have used Bluetooth: Peripheral, demonstrating the BLE Peripheral role.

Elfving said:

And my understanding is that you are using normal BLE for this, not LE Audio, is that correct?

Yes, I am using normal BLE.

I hope I have given you some clarity.

Thank you

[Elfving]

I see. 

I should also mention that our DevAcademy courses are a great resource, I bet the one about Bluetooth would be very interesting for you.

So you are sending this data array you created, could you expand a bit on the part about the characteristics? What are you using on the other end? A BLE central sample?

Regards,

Elfving

[pal_722]

Hi Elfving 

Elfving said:

should also mention that our DevAcademy courses are a great resource, I bet the one about Bluetooth would be very interesting for you.

OK. I'll look into the courses.

Elfving said:

So you are sending this data array you created, could you expand a bit on the part about the characteristics? What are you using on the other end? A BLE central sample?

The array is randomly generated and sent to the mobile using bt_nus_send() function and I receive the array in the TX characteristics under NUS, where the array is updated when the notification is enabled.

Regards
Pallavi

[Elfving]

pal_722 said:

OK. I'll look into the courses.

Great, I think that is a great resource and starting point 

pal_722 said:

The array is randomly generated and sent to the mobile using bt_nus_send() function and I receive the array in the TX characteristics under NUS, where the array is updated when the notification is enabled.

But on a separate DK, right?

[pal_722]

Elfving said:

But on a separate DK, right?

I am using nrf5340 Audio DK, configured as peripheral and Mobile as the central.

[Elfving]

Ah understood. Are you receiving this data with nRF Connect application?