How to transfer huge data over ble?

[Sandeep singh]

Hi,

I currently need to stream 1000 data samples over BLE, each data sample is 14 bit value, hence i'll be using a short integer but i'm confused as to how to send it over BLE,

i have looked and read many comments with similar query but all of the seem a tad confusing. I am fairly new to BLE so would appreciate any help or suggestions that you can provide.

As i understand we'll have to divide the 1000 samples into small chunks and send it but i'm not quite sure what that process entails.

I am using a nrf52832 board with sdk 16 on segger embedded studio.

Thanks  :)

[balomueller]

Hi Sandeep,

you are right, splitting up the data into chunks and combining them afterwards is the right way.

You can have a look into the dfu code in the SDK. There it is already implemented. So you could copy that code for your own purposes.

All the best!

[Sandeep singh]

Hi  balomuller, thank you  for your reply. One more doubt i have, this is the code what you were referring to if i'm not wrong?

memset(&hvx_params, 0, sizeof(hvx_params));

hvx_len = len;
hvx_data[0] = DFU_OP_RESPONSE_CODE;
hvx_data[1] = (uint8_t)op_code;
hvx_data[2] = (uint8_t)rsp_code;

Here the MAX_CTRL_POINT_RESP_PARAM_LEN macro is set to 3, what is the max number that we can provide??

is it 20??

[run_ar]

If you want to use dfu as a base you probably want to look at the DFU Packet, and not the control point for the datatransfer part. Note that DFU is designed to transfer data from the gatt client to the gatt server.. Other alternatives could be the Experimental: ATT_MTU Throughput Example but this does not handle dividing and combining data, as it just sends garbage.