nRF5340 Dynamic Connection Event Length

[AKV]

Hi,

I need to use two or more different event lengths for different modes. The event length should be set based on the mode before establishing a connection. I found that sdc_hci_cmd_vs_event_length_set() can be used for this purpose.

To implement this, I added the header:

#include <sdc_hci_vs.h>

Then, I tried to use the function with the following code:

uint8_t err;
static sdc_hci_cmd_vs_event_length_set_t event_length_param;
event_length_param.event_length_us = 5000;

err = sdc_hci_cmd_vs_event_length_set(&event_length_param);
if (err)
    printk("Failed to set event length (err %d)\n", err);
else
    printk("Event length set to %u units\n", event_length_param.event_length_us);

However, I am unable to compile the project due to the following error:
"Undefined reference to sdc_hci_cmd_vs_event_length_set."

Could you help me understand why this error occurs? Are there additional header files or configurations required?

Can you please provide an example implementation to make integration easier?

[dejans]

Hi,

Is your application based on any of our samples?

Which NCS version do you use?

Can you provide complete error log?

Best regards,
Dejan

[AKV]

Hi,

dejans said:

Which NCS version do you use?

NCS version 2.6.1.

dejans said:

Is your application based on any of our samples?

No, Our custom board code. 

Please check the complete log.

Fullscreen log14032025.txt Download

 *  Executing task: nRF Connect: Build: C50T1_RideGrid_nRF5340/build (active) 

Building C50T1_RideGrid_nRF5340
C:\WINDOWS\system32\cmd.exe /d /s /c "west build --build-dir d:/NORDIC/Projects/C50T1_RideGrid_nRF5340/build d:/NORDIC/Projects/C50T1_RideGrid_nRF5340"

[0/26] Performing build step for 'mcuboot_subimage'
ninja: no work to do.
[0/5] Performing build step for 'b0n_subimage'
ninja: no work to do.
[3/18] Building C object CMakeFiles/app.dir/src/main.c.obj
In file included from D:/NORDIC/Projects/C50T1_RideGrid_nRF5340/src/custom_module/MeshConnection.h:2,
                 from D:/NORDIC/Projects/C50T1_RideGrid_nRF5340/src/main.c:19:
D:/NORDIC/nRFConnectSDK/v2.6.1/zephyr/include/zephyr/random/rand32.h:13:2: warning: #warning "<zephyr/random/rand32.h> is deprecated, include <zephyr/random/random.h> instead" [-Wcpp]
   13 | #warning "<zephyr/random/rand32.h> is deprecated, include <zephyr/random/random.h> instead"
      |  ^~~~~~~
In file included from D:/NORDIC/Projects/C50T1_RideGrid_nRF5340/src/main.c:26:
D:/NORDIC/Projects/C50T1_RideGrid_nRF5340/src/legacy_module/inc/fm_config.h:25:1: warning: multi-line comment [-Wcomment]
   25 | // #define FM_UUID_SERV_VAL \
      | ^
D:/NORDIC/Projects/C50T1_RideGrid_nRF5340/src/legacy_module/inc/fm_config.h:27:1: warning: multi-line comment [-Wcomment]
   27 | // #define FM_MESH_SERVICE_CHAR_UUID_VAL \
      | ^
D:/NORDIC/Projects/C50T1_RideGrid_nRF5340/src/main.c:86:6: warning: return type of 'main' is not 'int' [-Wmain]
   86 | void main(void)
      |      ^~~~
D:/NORDIC/Projects/C50T1_RideGrid_nRF5340/src/main.c: In function 'main':
D:/NORDIC/Projects/C50T1_RideGrid_nRF5340/src/main.c:96:9: warning: implicit declaration of function 'buffer_init' [-Wimplicit-function-declaration]
   96 |         buffer_init();
      |         ^~~~~~~~~~~
D:/NORDIC/Projects/C50T1_RideGrid_nRF5340/src/main.c:99:9: warning: implicit declaration of function 'ridegrid_device_info_send' [-Wimplicit-function-declaration]
   99 |         ridegrid_device_info_send();
      |         ^~~~~~~~~~~~~~~~~~~~~~~~~
[5/18] Linking C executable zephyr\zephyr_pre0.elf
FAILED: zephyr/zephyr_pre0.elf zephyr/zephyr_pre0.map D:/NORDIC/Projects/C50T1_RideGrid_nRF5340/build/zephyr/zephyr_pre0.map 
cmd.exe /C "cd . && D:\NORDIC\nRFConnectSDK\toolchains\cf2149caf2\opt\zephyr-sdk\arm-zephyr-eabi\bin\arm-zephyr-eabi-gcc.exe  -gdwarf-4 @CMakeFiles\zephyr_pre0.rsp -o zephyr\zephyr_pre0.elf  && cmd.exe /C "cd /D D:\NORDIC\Projects\C50T1_RideGrid_nRF5340\build\zephyr && D:\NORDIC\nRFConnectSDK\toolchains\cf2149caf2\opt\bin\cmake.exe -E true""
d:/nordic/nrfconnectsdk/toolchains/cf2149caf2/opt/zephyr-sdk/arm-zephyr-eabi/bin/../lib/gcc/arm-zephyr-eabi/12.2.0/../../../../arm-zephyr-eabi/bin/ld.bfd.exe: app/libapp.a(main.c.obj): in function `main':
D:/NORDIC/Projects/C50T1_RideGrid_nRF5340/src/main.c:106: undefined reference to `sdc_hci_cmd_vs_event_length_set'
collect2.exe: error: ld returned 1 exit status
ninja: build stopped: subcommand failed.
FATAL ERROR: command exited with status 1: 'D:\NORDIC\nRFConnectSDK\toolchains\cf2149caf2\opt\bin\cmake.EXE' --build 'd:\NORDIC\Projects\C50T1_RideGrid_nRF5340\build'

 *  The terminal process terminated with exit code: 1. 
 *  Terminal will be reused by tasks, press any key to close it. 

[dejans]

Hi,

Can you check if you have included CONFIG_BT_CTLR_SDC_MAX_CONN_EVENT_LEN_DEFAULT in your configuration for the bluetooth controller running on the network core as described in this ticket?

Best regards,
Dejan

[AKV]

Hi,

Yes I am using this in the net core file (custom_nrf5340_cpunet_defconfig file.)

CONFIG_BT_CTLR_SDC_MAX_CONN_EVENT_LEN_DEFAULT=5000.

I have tried removing this config, but still getting the same error.