There are a way to clean queued data on tx buffer?

[sotillo2409]

Hi everyone,

I am using nrfConnect 3.9.3, And SDK v1.7.0.

I am working on a project based on uart example.

My question is if there are some way for clean/discard all the data that a peer have buffered on nus tx characteristic through bt_nus_send().

The main reason is that i want to send only one packet per connection with the less delay possible, for that I turn on the Radio Notifications with MPSL_RADIO_NOTIFICATION_DISTANCE_5500US, and when is triggered i refresh the packet with the data of my sensors.

On add if there are some way to make longer this time MPSL_RADIO_NOTIFICATION_DISTANCE_5500US could be great.

Thank you Nordic Team,

regards

[sotillo2409]

Hi another time, I was trying to find a function to clean (&att->tx_queue), due to  this buffer is filled when bt_nus_send() -> gatt_notify() -> bt_att_send()

On the last function is filled the buffer with the function

net_buf_put(&att->tx_queue, buf);

So makes sense that att_reset() clean all the att->tx_queue

static void att_reset(struct bt_att *att)
{
	struct bt_att_req *req, *tmp;
	struct net_buf *buf;

#if CONFIG_BT_ATT_PREPARE_COUNT > 0
	/* Discard queued buffers */
	while ((buf = net_buf_get(&att->prep_queue, K_NO_WAIT))) {
		net_buf_unref(buf);
	}
#endif /* CONFIG_BT_ATT_PREPARE_COUNT > 0 */

	while ((buf = net_buf_get(&att->tx_queue, K_NO_WAIT))) {
		net_buf_unref(buf);
	}

	att->conn = NULL;

	/* Notify pending requests */
	SYS_SLIST_FOR_EACH_CONTAINER_SAFE(&att->reqs, req, tmp, node) {
		if (req->func) {
			req->func(NULL, BT_ATT_ERR_UNLIKELY, NULL, 0,
				  req->user_data);
		}

		bt_att_req_free(req);
	}

	k_mem_slab_free(&att_slab, (void **)&att);
}

Unfortunatelly isn't work, data queued keeps beeing sended.

sotillo2409 said:

My question is if there are some way for clean/discard all the data that a peer have buffered on nus tx characteristic through bt_nus_send().

Any suggestion is welcome, i think that what i am asking mustn't be an impossibble thing, no?

Thank you

[Priyanka]

Hi Daniel,

Kindly take a look at the MPSL RADIO NOTIFICATION DISTANCES. Hope this helps.

Regards,

Priyanka

[sotillo2409]

Hi, sorry but I have implemented the radio notification distances callback already. What I need is a way to clean the data queued on ble tx buffer as i explained on my first post

sotillo2409 said:

My question is if there are some way for clean/discard all the data that a peer have buffered on nus tx characteristic through bt_nus_send().

Thank you Priyanka

[sotillo2409]

Hi another tiime,

my question is same as:

https://devzone.nordicsemi.com/f/nordic-q-a/37627/reset-clear-hvn-tx-queue

But on the SDK 1.7.0 on a nrf52840 with softdevice s140.

Thank you

[sotillo2409]

As I know data is queued until data is sent or there is a disconnection.

There isn't a way to trigger the same function as a disconnection trigger to clean the ble tx buffer on softdevice?

Thank you

[Priyanka]

Hi Daniel,

I am afraid there is no way to achieve this. Once the data is uploaded in the stack it stays there until it is transmitted or disconnected.

Regards,

Priyanka