Several questions about sparkfun nrf52840 BLE connections

RE: Several questions about sparkfun nrf52840 BLE connections

Simonr — Fri, 21 Feb 2020 08:01:02 GMT

Okay, I think this is due to the connection handles not being handled correctly. In the on_connected() function in main of the original multiperipheral example, where nrf_ble_qwr_conn_handle_assign() is called in this example, the connection handle is an array. You can see how this connection handle is used in the led_status_send_to_all() function. This is how the connection handle should be sent into ble_nusdata_send() in your example as well.

Best regards,

Simon

RE: Several questions about sparkfun nrf52840 BLE connections

BMG — Thu, 20 Feb 2020 14:41:56 GMT

Yes, you're right.

I don't have an extra nRF5x DK, but I know that on ble_app_uart, sending a string from peripheral to central has no problem.

I verified better in ble_nus_data_send() and I get NRF_ERROR_NOT_FOUND from sd_ble_gatts_value_get().

I saw that this error means Attribute not found, but I really don't know how to solve it because in ble_app_uart, I don't have this problem

RE: Several questions about sparkfun nrf52840 BLE connections

Simonr — Thu, 20 Feb 2020 14:24:53 GMT

In that case, there must be something wrong in your ble_nus_data_send() function. If you have an extra nRF5x DK you can sniff the connection, to see if the data is sent at all, and what exactly happens to it using our nRFSniffer for Bluetooth LE.

Best regards,

Simon

RE: Several questions about sparkfun nrf52840 BLE connections

Simonr — Tue, 18 Feb 2020 07:42:16 GMT

I suggest you take a look at the ble_app_uart (peripheral) and ble_app_uart_c (central) examples for a better look at how the Nordic UART service works and how it should be handled, etc. as the documentation explains it better than I'm able to in a single comment.

Best regards,

Simon

RE: Several questions about sparkfun nrf52840 BLE connections

BMG — Mon, 17 Feb 2020 10:22:20 GMT

Hi,

I'm flashing using the USB cable and running some adafruit commands from terminal.

I want to find out where in the code of ble_app_uart (peripheral), I write something to the central so that is called BLE_NUS_C_EVT_NUS_TX_EVT in central (ble_app_uart_c). I really need this information because I want to do the same in ble_app_multiperipheral.

RE: Several questions about sparkfun nrf52840 BLE connections

Simonr — Mon, 17 Feb 2020 06:58:31 GMT

The BLE_NUS_C_EVT_NUS_TX_EVT should be called to indicate that the central received something from a peer, so when you write something to the central from the peripheral, this event should be called.

Out of curiosity, how are you flashing the applications onto your boards as you don't use a J-Link debugger of some kind?

Best regards,

Simon

RE: Several questions about sparkfun nrf52840 BLE connections

BMG — Fri, 14 Feb 2020 14:51:30 GMT

I don't have a debugger or emulator(J-Link) to see the error code, but the problem came from

err_code = sd_ble_uuid_vs_add(&nus_base_uuid, &p_nus->uuid_type);

Fortunately, I solved this problem by modifying:

static void services_init(void)

{

ret_code_t err_code;

ble_nus_init_t nus_init;

ble_lbs_init_t init;

nrf_ble_qwr_init_t qwr_init = {0};

// Initialize Queued Write Module instances.

qwr_init.error_handler = nrf_qwr_error_handler;

for (uint32_t i = 0; i < LINK_TOTAL; i++)

{

err_code = nrf_ble_qwr_init(&m_qwr[i], &qwr_init);

APP_ERROR_CHECK(err_code);

}

/* comment these lines */

// Initialize LBS.

// init.led_write_handler = led_write_handler;

//err_code = ble_lbs_init(&m_lbs, &init);

//APP_ERROR_CHECK(err_code);

// Initialize NUS.

memset(&nus_init, 0, sizeof(nus_init));

nus_init.data_handler = nus_data_handler;

err_code = ble_nus_init(&m_nus, &nus_init);

APP_ERROR_CHECK(err_code);

}

and in advertising_init I've added:

ble_uuid_t adv_uuids[] = {{BLE_UUID_NUS_SERVICE, NUS_SERVICE_UUID_TYPE}};

instead of

//ble_uuid_t adv_uuids[] = {{LBS_UUID_SERVICE, m_lbs.uuid_type}};

The problem is that now in ble_app_uart_c, in ble_nus_c_evt_handler(),

BLE_NUS_C_EVT_NUS_TX_EVT is not called, but

BLE_NUS_C_EVT_DISCOVERY_COMPLETE is called

. Do I have to enable something in the peripheral (ble_app_multiperipheral with NUS) to be called that event?

RE: Several questions about sparkfun nrf52840 BLE connections

Simonr — Fri, 14 Feb 2020 13:58:18 GMT

What error is it that you're getting? There should be an error code telling you what exactly is wrong. Have you included the necessary files for the NUS to work properly for example?

Best regards,

Simon

RE: Several questions about sparkfun nrf52840 BLE connections

BMG — Fri, 14 Feb 2020 11:37:22 GMT

Thank you Simonr.

For now, I've tried the ble_app_multiperipheral example, managing to connect all 3 devices.

I have a problem in the services_init function because I have to integrate NUS Service in this project (the error is caused by the bold lines):

static void services_init(void)

{

ret_code_t err_code;

ble_nus_init_t nus_init;

ble_lbs_init_t init;

nrf_ble_qwr_init_t qwr_init = {0};

// Initialize Queued Write Module instances.

qwr_init.error_handler = nrf_qwr_error_handler;

for (uint32_t i = 0; i < LINK_TOTAL; i++)

{

err_code = nrf_ble_qwr_init(&m_qwr[i], &qwr_init);

APP_ERROR_CHECK(err_code);

}

// // Initialize LBS.

init.led_write_handler = led_write_handler;

err_code = ble_lbs_init(&m_lbs, &init);

APP_ERROR_CHECK(err_code);

// Initialize NUS.

memset(&nus_init, 0, sizeof(nus_init));

nus_init.data_handler = nus_data_handler;

err_code = ble_nus_init(&m_nus, &nus_init);

APP_ERROR_CHECK(err_code);

}

I think I get a reset and no device is connected. Can you tell me which might be the solution? I have to set the nus handler, otherwise it will not be called when I send some data.

RE: Several questions about sparkfun nrf52840 BLE connections

Simonr — Fri, 14 Feb 2020 09:44:54 GMT

We do have a LESC multirole example, which is an application that can act either as a peripheral or centra, depending on how the connection is set up. Please check it out, as I think this would be very similar to what you want for your application.

Best regards,

Simon