How to set BLE device name based on device parameters

RE: How to set BLE device name based on device parameters

Randy Lee — Thu, 19 Oct 2023 17:50:24 GMT

I'm using SDK 15.3 on a 52840 and this works on startup, no problem.

Now suppose I want to change the name every couple of minutes? I can set the name with this code but it's not changing on the adverts as far as I can see. Must be missing something.

This post ( How to change the device name?) says to issue a function call that doesn't exist in this version of SDK (the post is quite old) and I haven't figured out what the right one is in this version of SDK. If I go back for an init using ble_advertising_init(), I get an 8 error code back.

RE: How to set BLE device name based on device parameters

Vidar Berg — Fri, 30 Apr 2021 08:43:22 GMT

I left the typecast there because we use it in our examples, but it's not required.

RE: How to set BLE device name based on device parameters

StefXinet — Thu, 29 Apr 2021 12:05:54 GMT

Thanks Vidar,

your solution is clear, but in this case you are passing to sd_ble_gap_device_name_set() a uint8_t* that isn't const

Ok for the typecasting, but could sd_ble_gap_device_name_set() accept a NON const pointer to string?

RE: How to set BLE device name based on device parameters

Vidar Berg — Thu, 29 Apr 2021 11:20:37 GMT

Hello,

You need to prepare the string into a contiguous buffer before you pass it to sd_ble_gap_device_name_set(). It may look something like this:

static void gap_params_init(void)
{
    uint32_t err_code;
    char device_name_str[BLE_GAP_DEVNAME_DEFAULT_LEN];
    char name[] = "Model";
    char sn[]   = "024585"; // Serial number to be loaded from an ext. EEPROM  
    
    sprintf(device_name_str, "%s %s", name, sn);

    err_code = sd_ble_gap_device_name_set(&sec_mode,
                                          (const uint8_t *) device_name_str,
                                          strlen(device_name_str));
    APP_ERROR_CHECK(err_code);
        
    ...

Hope this helps. If anything is unclear, let me know.

Best regards,

Vidar