Hello, I am trying to achieve high throughput on a custom board. I partially replicated BLE_Throughput example for an initial testing.
I am receiving the BLE data in MATLAB. In CubeMX, I use a custom ble template. I am trying send a payload 1000x times, in MATLAB i receive > 3000x randomly. (I mean > (3000 x 244) Bytes of course, not 3000 Bytes).
This is the main task for notification. Why I am receiving > 3000 Bytes while the transfer is limited by transfer_count?
volatile uint8_t transfer_flow = 0;
uint8_t transfer_count = 0;
void SendActivityData_Task_Update(void) {
uint8_t activity_buffer[244] = {0};
tBleStatus status = BLE_STATUS_INVALID_PARAMS;
memset(activity_buffer, 0x11, sizeof(activity_buffer));
if (transfer_flow == 1 && transfer_count < 1000) {
status = Custom_STM_App_Update_Char(CUSTOM_STM_ACTIVITYDATA_CHARINDICATE,
(uint8_t *)activity_buffer);
if (status == BLE_STATUS_INSUFFICIENT_RESOURCES)
{
transfer_flow = 0;
}
else
{
SendActivityData_ResumeNotification();
transfer_count++;
}
}
__NOP();
}
void SendActivityData_ResumeNotification(void) {
UTIL_SEQ_SetTask(1 << CFG_TASK_SEND_ACTIVITY_DATA,
CFG_SCH_PRIO_0);
}
To control the data flow, I added this event to custom_stm.c switch case.
case ACI_GATT_TX_POOL_AVAILABLE_VSEVT_CODE:
{
transfer_flow = 1;
SendActivityData_ResumeNotification();
__NOP();
break;
}
I am sure this must be something obvious. When a notification is unsuccessfull (e.g. insufficient resources), are the data queued and transferred later? I dont know what else would explain the excess data received.
I am also changing connection parameters in these 2 tasks, the parameters are recommended here (interval 320 = 400 ms) https://community.st.com/t5/stm32-mcus-wireless/stm32wb-data-throughput-issues/td-p/319093 . Return val is successfull. Still getting only < 10 kBytes speed:
void update_conn_parameters(void) {
uint16_t interval_min = 320;
uint16_t interval_max = 320;
uint16_t peripheral_latency = L2CAP_PERIPHERAL_LATENCY;
uint16_t timeout_multiplier = L2CAP_TIMEOUT_MULTIPLIER;
tBleStatus result;
result = aci_l2cap_connection_parameter_update_req(BleApplicationContext.BleApplicationContext_legacy.connectionHandle,
interval_min, interval_max,
peripheral_latency, timeout_multiplier);
__NOP();
}
void update_le_length(void) {
tBleStatus result;
result = hci_le_set_data_length(BleApplicationContext.BleApplicationContext_legacy.connectionHandle,
251, 2120);
__NOP();
}
