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  • Case ID: 280060
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i want to do simple data transfer and why blueetooth serial terminal was not be able to detect the device?

venkatesha kj

how to do simple data transfer using bluetooth serail terminal?

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    Hello,

    You could use the BLE NUS peripheral and central examples to do such a transfer between your devices.
    The examples will relay anything they receive over UART to their connected peer over BLE, and the peer will output the messages received over BLE out on its UART, and visa versa.
    Test this according to the example documentation, and let me know if you encounter any issues or questions.

    Best regards,
    Karl

  • 0 in reply to Karl Ylvisaker

    i go through the nsu code but which api was used to transfer the data?

  • 0 in reply to Karl Ylvisaker

    static void advertising_init(void)
    {
    uint32_t err_code;
    ble_advertising_init_t init;

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

    init.advdata.name_type = BLE_ADVDATA_FULL_NAME;
    init.advdata.include_appearance = false;
    // init.advdata.flags = BLE_GAP_ADV_FLAGS_LE_ONLY_LIMITED_DISC_MODE;
    init.advdata.flags = BLE_GAP_ADV_FLAGS_LE_ONLY_GENERAL_DISC_MODE;

    init.srdata.uuids_complete.uuid_cnt = sizeof(m_adv_uuids) / sizeof(m_adv_uuids[0]);
    init.srdata.uuids_complete.p_uuids = m_adv_uuids;

    init.config.ble_adv_fast_enabled = true;
    init.config.ble_adv_fast_interval = APP_ADV_INTERVAL;
    //init.config.ble_adv_fast_timeout = APP_ADV_DURATION;
    init.config.ble_adv_fast_timeout = 0;
    init.evt_handler = on_adv_evt;

    err_code = ble_advertising_init(&m_advertising, &init);
    APP_ERROR_CHECK(err_code);

    ble_advertising_conn_cfg_tag_set(&m_advertising, APP_BLE_CONN_CFG_TAG);
    }

    in advertisement initialisation where actually tx power was set?

  • 0 in reply to venkatesha kj

    If you do not specify it explicitly it will use the default value of +0 dBm.
    You may re-configure this at the end of the advertising_init function.

    Best regards,
    Karl

  • 0 in reply to Karl Ylvisaker

    static void advertising_init(void)
    {
    int8_t tx_power_level = 4;
    uint32_t err_code;
    ble_advertising_init_t init;

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

    init.advdata.name_type = BLE_ADVDATA_FULL_NAME;
    init.advdata.include_appearance = false;
    // init.advdata.flags = BLE_GAP_ADV_FLAGS_LE_ONLY_LIMITED_DISC_MODE;
    init.advdata.flags = BLE_GAP_ADV_FLAGS_LE_ONLY_GENERAL_DISC_MODE;

    init.srdata.uuids_complete.uuid_cnt = sizeof(m_adv_uuids) / sizeof(m_adv_uuids[0]);
    init.srdata.uuids_complete.p_uuids = m_adv_uuids;

    init.config.ble_adv_fast_enabled = true;
    init.config.ble_adv_fast_interval = APP_ADV_INTERVAL;
    //init.config.ble_adv_fast_timeout = APP_ADV_DURATION;
    init.config.ble_adv_fast_timeout = 0;
    init.evt_handler = on_adv_evt;

    err_code = ble_advertising_init(&m_advertising, &init);
    APP_ERROR_CHECK(err_code);

    ble_advertising_conn_cfg_tag_set(&m_advertising, APP_BLE_CONN_CFG_TAG);

    err_code = sd_ble_gap_tx_power_set(BLE_GAP_TX_POWER_ROLE_ADV, m_advertising.adv_handle, tx_power_level);
    APP_ERROR_CHECK(err_code);
    }

    i have set the transmit power to 4dbm but in nrf connect app rssi level was -45dbm when i am near to the device will the tx power set to 4dbm or not? and am using s140 can i set Supported tx_power values: -40dBm, -20dBm, -16dBm, -12dBm, -8dBm, -4dBm, 0dBm, +3dBm and +4dBm.
    * In addition, on some chips following values are supported: +2dBm, +5dBm, +6dBm, +7dBm and +8dBm. any of the tx power level?

  • 0 in reply to venkatesha kj
    venkatesha kj said:
    i have set the transmit power to 4dbm but in nrf connect app rssi level was -45dbm when i am near to the device will the tx power set to 4dbm or not?

    No, the +4 dBm is what the radio will be outputting - so the RSSI on the receiving device will always be lower than the power it was sent with. -45 dBm is a normal value for a close device.

    venkatesha kj said:
    and am using s140 can i set Supported tx_power values: -40dBm, -20dBm, -16dBm, -12dBm, -8dBm, -4dBm, 0dBm, +3dBm and +4dBm.
    * In addition, on some chips following values are supported: +2dBm, +5dBm, +6dBm, +7dBm and +8dBm. any of the tx power level?

    The possible TXPOWER levels depends on which SoC you are using, not which SoftDevice you are using. You could see which power levels are supported in the TXPOWER register of the device you are working with.

    Best regards,
    Karl

  • 0 in reply to Karl Ylvisaker

    RSSI actually indicates the received strength right then if the transmited signal strength is 4dbm then why rssi shows -45dbm?

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