how to send mac address as characteristic value?

RE: how to send mac address as characteristic value?

rushin — Sun, 13 Dec 2015 05:52:09 GMT

thanks for your help. its working

RE: how to send mac address as characteristic value?

Anders Strand — Tue, 08 Dec 2015 11:22:46 GMT

The device you connect to can read your address when you send it BLE packets. I do not know why you want to send it as a characteristic, but this would in most cases be unnecessary.

RE: how to send mac address as characteristic value?

monpetit — Mon, 07 Dec 2015 14:50:06 GMT

like this:

ble_gap_addr_t ble_gap_addr;

uint32_t get_address(void)
{
    return sd_ble_gap_address_get(&ble_gap_addr);
}

int main(void)
{
    ......

    while (1) {
        uint32_t err_code;
        err_code = get_address();
        APP_ERROR_CHECK(err_code);
        err_code = custom_service_update_data(m_conn_handle, ble_gap_addr.addr);
        APP_ERROR_CHECK(err_code);
        app_sched_execute();
        power_manage(); 
    } 
}

RE: how to send mac address as characteristic value?

rushin — Mon, 07 Dec 2015 14:20:26 GMT

then what should i return value?

RE: how to send mac address as characteristic value?

monpetit — Mon, 07 Dec 2015 14:13:45 GMT

The return value of your function get_address() is not mac address but the error code of nRF51 SDK. The value is NRF_SUCCESS or NRF_ERROR_INVALID_ADDR.

RE: how to send mac address as characteristic value?

rushin — Mon, 07 Dec 2015 13:19:57 GMT

hello i declared ble_gap_addr outside function and write function as below

uint8_t get_address(void)
{
    uint8_t err_code;
    memset(&ble_gap_addr, 0, sizeof(ble_gap_addr));
    ble_gap_addr.addr_type= BLE_GAP_ADDR_TYPE_RANDOM_STATIC;//BLE_GAP_ADDR_TYPE_PUBLIC;
    err_code = sd_ble_gap_address_get(&ble_gap_addr);
    return(err_code);
}

and then i write main code as below

int main(void)
{ 
    uint32_t err_code;
    uint8_t		char2_data[CHARACTERISTIC_SIZE];
    uint8_t i=0;
    // Initialize
    timers_init();
    ble_stack_init();
    scheduler_init();
    gap_params_init();
    advertising_init();
    conn_params_init();
    sec_params_init();

    // Start execution
    advertising_start();
    get_address();
    services_init();

 while(1)
 {
        char2_data[8] = get_address();//{0x10,0x20,};
        err_code = custom_service_update_data(m_conn_handle,char2_data);
        APP_ERROR_CHECK(err_code);
        app_sched_execute();
        power_manage();
    }
}

but in master control panel i am getting like this

AttributeHandleschanged Value:BD-9D-01-00-A8-2C-00-20-00-00-00-00-ED-84-01

can you tell me what should i return?

RE: how to send mac address as characteristic value?

Ulrich Myhre — Sun, 06 Dec 2015 13:38:44 GMT

The address is stored in the ble_gap_addr variable, which goes out of scope once you leave the function. You need to either declare the variable outside of this function, or make the function take a ble_gap_addr_t-pointer which you then use in the sd_ble_gap_address_get() call.