Advertising Name

[dmleone]

I am trying to find an example to do a BLE pairing. This is my first BLE experience and working with nRF52832 using SDK15.2 and softdevice API 6.1

I am trying to do a base station keyfob connection

i would like to make 1 item go into pair mode and advertise OTA with a specific advertising name. I am trying to work with the ble_app_template example, but i cannot find how to change the advertising name from DfuTarg to what i want it to be.

What are the examples that are recommended to do the pairing i should review?

Also what is buttonless dfu? And if i want it to auto pair when near is that considered buttonless? endgame i would want to initiate a pairing sequence, but once paired, the paired device should remain paired and if within range, be able to communicate./ It is a key fob type situation.

Any informaiton would be helpful with this

[dmleone]

I have been working with this how-to https://devzone.nordicsemi.com/tutorials/b/bluetooth-low-energy/posts/ble-characteristics-a-beginners-tutorial and it seems to be very helpful. I made it to the last page and i have a few issue with the operation

#define BLE_UUID_OUR_BASE_UUID              {0x23, 0xD1, 0x13, 0xEF, 0x5F, 0x78, 0x23, 0x15, 0xDE, 0xEF, 0x12, 0x12, 0x00, 0x00, 0x00, 0x00} // 128-bit base UUID
#define BLE_UUID_OUR_SERVICE                0xABCD // Just a random, but recognizable value

void our_service_init(ble_os_t * p_our_service)
{

    // Declare 16 bit service and 128 bit base UUIDs and add them to BLE stack table     
    uint32_t   err_code;
    ble_uuid_t        service_uuid;
    ble_uuid128_t     base_uuid = BLE_UUID_OUR_BASE_UUID;
    service_uuid.uuid = BLE_UUID_OUR_SERVICE;
    service_uuid.type = BLE_UUID_TYPE_BLE;  // Had to add this and comment out below lines to make work
    //err_code = sd_ble_uuid_vs_add(&base_uuid, &service_uuid.type);
    //APP_ERROR_CHECK(err_code);
  
    // Add service
    
    err_code = sd_ble_gatts_service_add(BLE_GATTS_SRVC_TYPE_PRIMARY,
                                    &service_uuid,
                                    &p_our_service->service_handle);
   
    APP_ERROR_CHECK(err_code);
}

The sd_ble_uuid_vs_add() was not working right and when i tried to use it it would break. So i could not use vendor specific base UUID. which makes the other parts kinda of sketchy to get operating.

Is there some reason when i try and use the vendor specific base UUID it is not working?

Also in these turtorials there is not good example of how i can connect a second nRF52 module to this one. I am assuming something like the following:

Scan for Device Name -> if device name "X" is found then pair -> after pairing, send info from A to B and then B to A

This info was so far really good so far. I am hoping there is another similar tutorial on setting up pairing between 2 nRF52832 modules.

[wpaul]

dmleone said:

Is there some reason when i try and use the vendor specific base UUID it is not working?

There's no way to answer this unless you provide more details. What does "not working" mean exactly? What erroneous behavior did you observe? Did sd_ble_uuid_vs_add() return an error? If so, what was it?

In order to add a vendor-specific UUID, you need to tell the SoftDevice to reserve some storage for it first. This is done by calling sd_ble_cfg_set() with BLE_COMMON_CFG_VS_UUID, e.g.:

ble_cfg_t cfg;
uint32_t ram_start = YOUR_RAM_START_ADDR;
int r;

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

cfg.common_cfg.vs_uuid_cfg.vs_uuid_count = 1;

r = sd_ble_cfg_set (BLE_COMMON_CFG_VS_UUID, &cfg, ram_start);

Note that this may also require reserving some additional RAM for SoftDevice. I don't know if you've had to deal with that particular concept yet. Basically, you may need to edit the linker script for the example to change the ORIGIN address and LENGTH for the RAM region. The SoftDevice wants to use RAM starting at address 0x20000000, up to some length. Your application is allowed to use memory _after_ that. The examples are configured to allocate enough memory for what the sample features need, but if you add something else, you'll need to move the ORIGIN address higher and decrease the LENGTH by the same amount.

-Bill

[AndreasF]

Hi.

You can correct the RAM start address by following step 7 in this tutorial.

dmleone said:

RAM_START=0x20004000

RAM_SIZE=0xc000

This might not be correct, because 0x4000 + 0xc000 = 0x10000 is 64 kB RAM, and the nRF52832 has either 64 kB or 32 kB RAM, as you can read here.

For 32 kB it has to be 0x4000 for RAM_SIZE.

Best regards,

Andreas

[dmleone]

i also noticed 10000 is not 64k but that seems to be the values listed in all the examples. i have the 64kB chip. I a,so used that link to do some understanding on memory spacing. what is the value i should use for max ram size if 10000 is not the correct one for this chip per examples?

[dmleone]

Additional issue i had was the sdk_config file did not have correct settings. The tutorial didnt explain the need to update that. Once i updated NRF_SDH_BLE_VS_UUID_COUNT within the sdk, it did as expected. and increased memory. Your answer was helpful to establish memory for it. thanks

[AndreasF]

Hi.

dmleone said:

i also noticed 10000 is not 64k but that seems to be the values listed in all the examples. i have the 64kB chip. I a,so used that link to do some understanding on memory spacing. what is the value i should use for max ram size if 10000 is not the correct one for this chip per examples?

 

Sorry, I wrote wrong, I've edited that.

Did you get it working now? :-)

Best regards,

Andreas

[dmleone]

yes. I got it running for tutorial now i am off to setting up a new project to try and get 2 boards to pair so will probably have other issues but hopefully maybe already asked. I am getting more familiar with this stuff. just 1 question. If i want to run a key fob. is best scenario using key fob as the server, the main box as a client. and is a service the way to transport data between the 2? I only know of a service so far from the tutorial i did. Is there any other means of transmitting data, besides possibly just blasting it in the advertising packet itself if it is a small enough payload.

[AndreasF]

Hi.

You could have the key fob set up as a server (peripheral), and what you call "main box" as a client, and send notifications between them.

Best regards,

Andreas