Changing device name dynamically

[Daniel]

Hi there,

I am using the nRF connect app on Android to see my dongle's name. I want the name to change every 5 seconds from one name to another. This is just for evaluation.

How can I do this? I am using SDK 15 with SD S140. I am using the LED button example.

A snippet of my code:

          BLE_GAP_CONN_SEC_MODE_SET_OPEN(&sec_mode);
          sd_ble_gap_device_name_set(&sec_mode, (const uint8_t *)DEVICE_NAME_2, strlen(DEVICE_NAME_2));
          ble_advdata_encode(&advdata, m_adv_data.adv_data.p_data, &m_adv_data.adv_data.len);
          sd_ble_gap_adv_set_configure(&m_adv_handle, &m_adv_data, &adv_params);
          sd_ble_gap_adv_start(m_adv_handle, APP_BLE_CONN_CFG_TAG);
          bsp_board_led_on(CONNECTED_LED);
          nrf_delay_ms(5000);
          BLE_GAP_CONN_SEC_MODE_SET_OPEN(&sec_mode);
          sd_ble_gap_device_name_set(&sec_mode, (const uint8_t *)DEVICE_NAME, strlen(DEVICE_NAME));
          ble_advdata_encode(&advdata, m_adv_data.adv_data.p_data, &m_adv_data.adv_data.len);
          sd_ble_gap_adv_set_configure(&m_adv_handle, &m_adv_data, &adv_params);
          sd_ble_gap_adv_start(m_adv_handle, APP_BLE_CONN_CFG_TAG);
          bsp_board_led_off(CONNECTED_LED);
          nrf_delay_ms(5000);

[Jared]

Hi,

Instead of using nrf_delay_ms you can use the app timer and handle the name change in its timeout handler. Changing the device name has been discussed in many threads on this forum, i suggest that you use the search function to find examples on how to do it :) 

Best regards

Jared 

[Daniel]

Yes, the delay is just there temporarily. Can you add a link to the post which discusses using SDK 15 specifically.

I have searched and nothing has worked so far...

[awneil]

How to properly post source code:

[Jared]

Hi,

Are you getting any error codes from your code? You should stop the advertising before each call to sd_ble_gap_adv_start()

Jared 

[Daniel]

I was able to get this working by doing something like this:

static void setDeviceName(deviceStatus_t status)
{
    ble_gap_conn_sec_mode_t sec_mode;
    BLE_GAP_CONN_SEC_MODE_SET_OPEN(&sec_mode);
    
    // Set the device name
    switch(status)
    {
        case STATUS_LOW:
            sd_ble_gap_device_name_set(&sec_mode, (const uint8_t *)DEVICE_NAME_LOW, strlen(DEVICE_NAME_LOW));
            bsp_board_led_on(BSP_BOARD_LED_1);
            break;
        case STATUS_MED:
            sd_ble_gap_device_name_set(&sec_mode, (const uint8_t *)DEVICE_NAME_MED, strlen(DEVICE_NAME_MED));
            bsp_board_led_on(BSP_BOARD_LED_3);
            break;
        case STATUS_HIGH:
            sd_ble_gap_device_name_set(&sec_mode, (const uint8_t *)DEVICE_NAME_HIGH, strlen(DEVICE_NAME_HIGH));
            bsp_board_led_on(BSP_BOARD_LED_2);
            break;
        case STATUS_ERR:
            sd_ble_gap_device_name_set(&sec_mode, (const uint8_t *)DEVICE_NAME_ERR, strlen(DEVICE_NAME_ERR));
            bsp_board_led_on(BSP_BOARD_LED_0);
            break;   
    }

    // Encode the advertising packet and start advertising
    ble_advdata_encode(&advdata, m_adv_data.adv_data.p_data, &m_adv_data.adv_data.len);
    sd_ble_gap_adv_set_configure(&m_adv_handle, &m_adv_data, &adv_params);
    sd_ble_gap_adv_stop(m_adv_handle);
    sd_ble_gap_adv_start(m_adv_handle, APP_BLE_CONN_CFG_TAG);
}