How to transfer huge data over ble?

RE: How to transfer huge data over ble?

run_ar — Wed, 30 Sep 2020 13:26:57 GMT

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.

RE: How to transfer huge data over ble?

Sandeep singh — Tue, 29 Sep 2020 04:38:01 GMT

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??

RE: How to transfer huge data over ble?

balomueller — Mon, 28 Sep 2020 15:33:56 GMT

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!