bt_nus_send() failed with error code 0xffffff80

RE: bt_nus_send() failed with error code 0xffffff80

snowuyl — Mon, 19 Jun 2023 13:38:35 GMT

Thanks for your reply!

RE: bt_nus_send() failed with error code 0xffffff80

Susheel Nuguru — Mon, 19 Jun 2023 12:01:00 GMT

sounds very similar to this thread.

Make sure to set the callback handler set. It seems like you are passing NULL to uart_callback_set

RE: bt_nus_send() failed with error code 0xffffff80

snowuyl — Wed, 14 Jun 2023 06:44:27 GMT

devzone.nordicsemi.com/.../2766.minimal_5F00_log_5F00_nus.zip

RE: bt_nus_send() failed with error code 0xffffff80

snowuyl — Wed, 14 Jun 2023 06:43:29 GMT

devzone.nordicsemi.com/.../0333.custom_5F00_nrf52832.zip

RE: bt_nus_send() failed with error code 0xffffff80

snowuyl — Wed, 14 Jun 2023 06:38:26 GMT

Thanks for your suggestion! I have integrated source code of peripheral_uart project. But now I encounter another problem. That is "<err> nus: Cannot initialize UART callback -88". What is meaning of error code -88? And how can I fix this issue?

The following is log messages.

00> *** Booting Zephyr OS build v3.2.99-ncs2 ***
00> Starting button Test example
00> configure AFE4900_RDY pin as input
00> configure AFE4900_RESET pin as output
00> configure POWER_UP pin as output
00> configure LED_G pin as output
00> set POWER_UP pin
00> clear AFE4900_RESET pin, 0
00> set AFE4900_RESET pin
00> [00:00:00.010,986] <err> nus: Cannot initialize UART callback -88
00> btInit() e
00> bt_passkey_set(123456)
00> _btReady(0) e
00> Bluetooth initialized

Function that prints "<err> nus: Cannot initialize UART callback -88".

int uart_init(void) {
int err;
int pos;
uart_data_t *rx;
uart_data_t *tx;

if (!device_is_ready(uart)) {
printk("uart device isn't ready\n");
return -ENODEV;
}

if (IS_ENABLED(CONFIG_USB_DEVICE_STACK)) {
err = usb_enable(NULL);
if (err && (err != -EALREADY)) {
LOG_ERR("Failed to enable USB");
return err;
}
}

rx = k_malloc(sizeof(*rx));
if (rx) {
rx->len = 0;
} else {
return -ENOMEM;
}

k_work_init_delayable(&uart_work, uart_work_handler);

if (IS_ENABLED(CONFIG_BT_NUS_UART_ASYNC_ADAPTER) && !uart_test_async_api(uart)) {
/* Implement API adapter */
uart_async_adapter_init(async_adapter, uart);
uart = async_adapter;
}

err = uart_callback_set(uart, uart_cb, NULL);
if (err) {
k_free(rx);
LOG_ERR("Cannot initialize UART callback %d", err);
return err;
}

if (IS_ENABLED(CONFIG_UART_LINE_CTRL)) {
LOG_INF("Wait for DTR");
while (true) {
uint32_t dtr = 0;

uart_line_ctrl_get(uart, UART_LINE_CTRL_DTR, &dtr);
if (dtr) {
break;
}
/* Give CPU resources to low priority threads. */
k_sleep(K_MSEC(100));
}
LOG_INF("DTR set");
err = uart_line_ctrl_set(uart, UART_LINE_CTRL_DCD, 1);
if (err) {
LOG_WRN("Failed to set DCD, ret code %d", err);
}
err = uart_line_ctrl_set(uart, UART_LINE_CTRL_DSR, 1);
if (err) {
LOG_WRN("Failed to set DSR, ret code %d", err);
}
}

tx = k_malloc(sizeof(*tx));

if (tx) {
pos = snprintf(tx->data, sizeof(tx->data), "Starting Nordic UART service example\r\n");
if ((pos < 0) || (pos >= sizeof(tx->data))) {
k_free(rx);
k_free(tx);
LOG_ERR("snprintf returned %d", pos);
return -ENOMEM;
}

tx->len = pos;
} else {
k_free(rx);
return -ENOMEM;
}

err = uart_tx(uart, tx->data, tx->len, SYS_FOREVER_MS);
if (err) {
k_free(rx);
k_free(tx);
LOG_ERR("Cannot display welcome message (err: %d)", err);
return err;
}

err = uart_rx_enable(uart, rx->data, sizeof(rx->data), 50);
if (err) {
LOG_ERR("Cannot enable uart reception (err: %d)", err);
/* Free the rx buffer only because the tx buffer will be handled in the callback */
k_free(rx);
}

return err;
}

RE: bt_nus_send() failed with error code 0xffffff80

snowuyl — Tue, 13 Jun 2023 11:46:08 GMT

k_fifo_put(&fifo_uart_rx_data, buf) is called in uart_cb(). But I don't have any idea when

uart_cb() is called?

static int uart_init(void)
{

...

err = uart_callback_set(uart, uart_cb, NULL);

...

}

static void uart_cb(const struct device *dev, struct uart_event *evt, void *user_data)
{

...

case UART_RX_BUF_RELEASED:
LOG_DBG("UART_RX_BUF_RELEASED");
buf = CONTAINER_OF(evt->data.rx_buf.buf, struct uart_data_t,
data);

if (buf->len > 0) {
k_fifo_put(&fifo_uart_rx_data, buf);
} else {
k_free(buf);
}

break;

...

}

RE: bt_nus_send() failed with error code 0xffffff80

Susheel Nuguru — Tue, 13 Jun 2023 11:19:58 GMT

Establishing the connection is not the problem. Your application that you shared can already connect to the central. The issue fencing your bt_nus_send with logic that would not unnecessarily try to send the notification when not needed. It also seems like you have no proper trigger to send the notification.

In our samples

void ble_write_thread(void)
{
	/* Don't go any further until BLE is initialized */
	k_sem_take(&ble_init_ok, K_FOREVER);

	for (;;) {
		/* Wait indefinitely for data to be sent over bluetooth */
		struct uart_data_t *buf = k_fifo_get(&fifo_uart_rx_data,
						     K_FOREVER);

		if (bt_nus_send(NULL, buf->data, buf->len)) {
			LOG_WRN("Failed to send data over BLE connection");
		}

		k_free(buf);
	}
}

you see that we use k_fifos to both change the context, serialize data and not call notification when there is no data. You have that part missing.

There are few threads in your application that I do not understand as well. I would recommend you to take the peripheral_uart sample as template and build your code on top of it.

RE: bt_nus_send() failed with error code 0xffffff80

snowuyl — Tue, 13 Jun 2023 11:11:00 GMT

_gBtNusThread is created after connected() callback function is called. Do you mean no connection exist even connected() callback function is called? Do you have sample code for establishing a connection?

BT_CONN_CB_DEFINE(conn_callbacks) = {
.connected = connected,
.disconnected = disconnected,
#ifdef CONFIG_BT_NUS_SECURITY_ENABLED
.security_changed = security_changed,
#endif
};

static void connected(struct bt_conn* conn, uint8_t err) {
char addr[BT_ADDR_LE_STR_LEN];

if (err) {
printk("Connection failed (err %u)", err);
return;
}

bt_addr_le_to_str(bt_conn_get_dst(conn), addr, sizeof(addr));
printk("Connected %s\n", addr);

_gCurrentConn = bt_conn_ref(conn);

const int ret = bt_conn_set_security(conn, BT_SECURITY_L2);
if (ret != 0) {
printk("Failed to set security (err %d)\n", ret);
}

btNusSetState(BT_NUS_STATE_CONNECT);
btNusThreadCreate();
}

RE: bt_nus_send() failed with error code 0xffffff80

Susheel Nuguru — Tue, 13 Jun 2023 11:04:37 GMT

It looks like you are trying to send a notification even without any connection established.

I do not understand the state machine of your application. You cannot just loop sending the notification without establishing a connection. You also need to wait for the notifications to be enabled.

If you look at the nrf\subsys\bluetooth\services\nus.c you see that bt_nus_send receives the data from the buffer allocated in the message queue. This is a correct way to to create a consumer/producer situation for the data to be handled. If you have problem designing an architecture for your application, then I strongly recommend you to take the NUS sample as a template and build on the top of it. I am not sure why you need to create your own library for NUS if this is already handled by our service library in nrf\subsys\bluetooth\services\nus.c

RE: bt_nus_send() failed with error code 0xffffff80

snowuyl — Mon, 12 Jun 2023 13:51:18 GMT

Thanks for your great support!

RE: bt_nus_send() failed with error code 0xffffff80

Susheel Nuguru — Mon, 12 Jun 2023 10:06:39 GMT

I managed to compile your application, I will try to debug this later today and comeback to you when I have some findings to share.

RE: bt_nus_send() failed with error code 0xffffff80

snowuyl — Mon, 12 Jun 2023 09:28:22 GMT

ret = bt_nus_send(btGetConnectHandle(), sbuf, len); // return error code -22

ret = bt_nus_send(NULL, sbuf, len); // return error code 0xffffff80

You can see code snippet by doing the following procedure.

1. Unzipping 8055.minimal_log_nus.zip

2. Checking function _btNusSend() of src/bt_nus.c

uint32_t _btNusSend(void) {

...

    ret = bt_nus_send(btGetConnectHandle(), sbuf, len);
    if (ret < 0) {
       printk("bt_nus_send(%p, %p, len=%u) failed, %d\n", btGetConnectHandle(), sbuf, len, ret);
       return ret;
    } else {
       printk("bt_nus_send(%p, %p, len=%u) ok\n", btGetConnectHandle(), sbuf, len);
   }

...

}

RE: bt_nus_send() failed with error code 0xffffff80

Susheel Nuguru — Mon, 12 Jun 2023 08:46:32 GMT

In your other thread you have

00> BT NUS thread starts running
00> bt_nus_send(0x20001db0, len=128) failed, -22

Why do you have two different prints giving different error value in your two different runs?

-22 means EINVAL 22 /* Invalid argument */

You need to check your arguments sent to bt_nus_send function to see if they are valid arguments as documented.

There is another thread that helps you with similar issue.

I do not see any source files in the project you attached. Can you please provide the code snippet for bt_nus_send so that I can focus on the contents of what you are sending through nus.

RE: bt_nus_send() failed with error code 0xffffff80

snowuyl — Mon, 12 Jun 2023 06:42:22 GMT

RE: bt_nus_send() failed with error code 0xffffff80

snowuyl — Mon, 12 Jun 2023 06:41:42 GMT

RE: bt_nus_send() failed with error code 0xffffff80

snowuyl — Mon, 12 Jun 2023 06:36:55 GMT

devzone.nordicsemi.com/.../8055.minimal_5F00_log_5F00_nus.zip

RE: bt_nus_send() failed with error code 0xffffff80

snowuyl — Mon, 12 Jun 2023 06:36:16 GMT

devzone.nordicsemi.com/.../7673.custom_5F00_nrf52832.zip