How to change the device name?

RE: How to change the device name?

John — Thu, 29 Oct 2015 10:13:27 GMT

Hi,

Yes,I'm sure.Now I have founf the problem.It is my fault that I have not write the length of device name to the flash,so DeviceNameLen is zero when the chip is powered up or reset.Thank you all the same.

RE: How to change the device name?

MartinBL — Thu, 29 Oct 2015 08:41:45 GMT

So this line prints the correct device name:

printf("change device name: %s",(uint8_t *)&at_com_data.device_name[1]);

And you are 100% sure that the first character in the device name is 'N'?

Also in the else-statement you don't call ble_advdata_set() so you will not be able to set the name to DEVICE_NAME.

Could you post your complete main.c file?

RE: How to change the device name?

John — Thu, 29 Oct 2015 08:23:40 GMT

Hi.Thank you for your hellp.May be you have not understood what I mean.I mean the device name(eg My_Device) has been save in the flash.When the chip is powered up or done reset,the code will run to the gap_params_init() function.In the function,I have done some modification.I will check whether there is a name saved in the flash,or it will use the default name defined in the Macro DEVICE_NAME.

The code as below:

        uint32_t                err_code;
        ble_gap_conn_params_t   gap_conn_params;
        ble_gap_conn_sec_mode_t sec_mode;
    
        BLE_GAP_CONN_SEC_MODE_SET_OPEN(&sec_mode);
        
    		if(at_com_data.device_name[0]=='N')				// Device name has been saved in the flash.
    		{
    //			printf("change device name: ");
    			printf("change device name: %s",(uint8_t *)&at_com_data.device_name[1]);
    			printf("\r\n");
    
    			err_code = sd_ble_gap_device_name_set(&sec_mode,
                                              (const uint8_t *)&at_com_data.device_name[1],
                                              DeviceNameLen);	
APP_ERROR_CHECK(err_code);
    			memset(&advdata, 0, sizeof(advdata));
    			advdata.name_type          = BLE_ADVDATA_FULL_NAME;
    			advdata.include_appearance = false;
    			advdata.flags              = BLE_GAP_ADV_FLAGS_LE_ONLY_LIMITED_DISC_MODE;

    			err_code = ble_advdata_set(&advdata, NULL);
    			APP_ERROR_CHECK(err_code);	
    //			printf("err_code=0x%08x\r\n",err_code);
    		}	
    		else
// Device name isn't in the flash.
    		{
    			printf("defaule name\r\n");
    			err_code = sd_ble_gap_device_name_set(&sec_mode,
                                              (const uint8_t *) DEVICE_NAME,
                                              strlen(DEVICE_NAME));
APP_ERROR_CHECK(err_code);
    		}

Since the chip has been powered up or reset,and can read the device name from the flash successfully,why cann't change the device name?What I use is SDK9.0,S130 V1.0,PCA10028 where there is nRF51422 on the board.

I also refer to your demo code and use a timer to change the name of a device every 10 second,most of time it is success.If the time less than 5 second,the device name canm't be changed mostly.

RE: How to change the device name?

MartinBL — Wed, 28 Oct 2015 11:50:00 GMT

Hi. You will need to call ble_advdata_set() after you have changed the name with sd_ble_gap_device_name_set(). See this thread for more info.

I have attached an example that uses a timer to change the name of a device every other second. It uses SDK V9 and Softdevice S110 V8. Search for // NORDIC in the example for comments.

Example.