DA14531 BLE data rate

Dear all,

I am wondering what is the highest data rate you managed to achieve with a DA14531 using Bluetooth communication.

It seems I can't go higher than ~2kBytes/s:

——我using the template code from 6.0.14.1114,

——我using the USB dev kit,

- I have tried with the complete template or only keeping 1 service with 1 characteristic (the "ADC_val_1"), it doesn't change anything

- If I set "string_len" lower than 200, it works well; but if I set it to a higher value (e.g. 250), the connection with the chip only last a few seconds.

Here is the code used for the test:

uint16_t string_len = 250; uint8_t dataToSend[400]; //unsigned int j = 0; void scheduler(void); void user_on_connection(uint8_t connection_idx, struct gapc_connection_req_ind const *param) { default_app_on_connection(connection_idx, param); app_easy_timer(10, scheduler); } void user_on_disconnect( struct gapc_disconnect_ind const *param ) { default_app_on_disconnect(param); } void scheduler(void){ /*for (unsigned int i = 0; i < string_len; i++) { dataToSend[i] = j*string_len+i; }*/ struct custs1_val_ntf_ind_req* req = KE_MSG_ALLOC_DYN(CUSTS1_VAL_NTF_REQ, prf_get_task_from_id(TASK_ID_CUSTS1), TASK_APP, custs1_val_ntf_ind_req, string_len); req->conidx = 0; req->notification = true; req->handle = SVC1_IDX_ADC_VAL_1_VAL; req->length = string_len; memcpy(req->value, dataToSend, string_len); ke_msg_send(req); app_easy_timer(10, scheduler); //j++; }

Would you have any idea or advices on how to achieve a higher transmission rate?

提前谢谢!