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,

Can you provide more information about your application? Is it based on any of our Bluetooth samples?

Edit:  You can look at the scanning while connecting sample. It shows how to set event_length_us parameter.

Best regards,
Dejan

[AKV]

Hi,

I have developed a custom BLE application code by using this custom_ncs_ble_service_sample tutorial. Its working fine.

We are developing a mesh network. Our requirement is the one device can connect to three other devices. Using one connection as a peripheral and up to two connections as a central for mesh connections.

We are using nRF5340 and the nRF Connect SDK Version 2.6.1.

I have attached our code in this private ticket. If needed you can refer this.  

Private ticket of other issue

[dejans]

Hi,

Thank you for additional information.

AKV said:

I have attached our code in this private ticket. If needed you can refer this.  

There are many files (including several zip files) in your previous ticket. Which file contains your code?

dejans said:

Edit:  You can look at the scanning while connecting sample. It shows how to set event_length_us parameter.

Can you look at the sample which I linked in my previous edited reply?

Best regards,
Dejan

[AKV]

Hi,

dejans said:

There are many files (including several zip files) in your previous ticket. Which file contains your code?

You can download any code, If you need latest one you download "ridegrid_06_28012025".

dejans said:

Can you look at the sample which I linked in my previous edited reply?

Yes, I have tried as given below. But the error is 

main.c:30:10: fatal error: bluetooth/hci_vs_sdc.h: No such file or directory
30 | #include <bluetooth/hci_vs_sdc.h> 

#include <bluetooth/hci_vs_sdc.h>
#include <zephyr/bluetooth/bluetooth.h>
#include <zephyr/bluetooth/addr.h>
#include <zephyr/bluetooth/conn.h>
#include <zephyr/bluetooth/hci.h>



sdc_hci_cmd_vs_event_length_set_t event_length_params = {
		.event_length_us = 2000,
	};

hci_vs_sdc_event_length_set(&event_length_params);

[dejans]

Hi,

I have reproduced your issue. I will look further into it. I expect to get back to you by the end of the week.

Best regards,
Dejan