Can't configure Femto Bolt Depth camera synchronisation from Orbbec Viewer

[DavidRobb]

Describe the bug
I have two Femot Bolt depth cameras updated to firmware 1.1.2 and connected via multisync cables and a daisy chain hub. I am trying to configure the depth trigger delay but the secondary device depth delay is being ignored whe using Orbbec Viewer version 2.1.1-main

Reproduction Steps
Connect the two cameras via USB and multi-sync cable config.

Run two instances of the Orbbec viewer. Connect one to the primary device and the other to the secondary.

Run Orbbec Viewer and connect to secondary device.

Enter Device Control . Synchronization Configuration:
Set mode to secondary
Depth Delay to 160uS
Write settings

Viewer says multi-sync config succeed! but the Depth delay value is reset ot 0uS

On starting depth stream, output is correctly paused until the Primary stream is started. However, on starting the primary stream, depth is started on the secondary but suffers from interference as there is no delay between Primary and Secondary.

Expected behavior
I expect the Depth delay setting to be stored and used to separate the image captures.

System Environment:

Windows 11
x86_64

OrbbecViewer_v2.1.1_202412201710_b40e003_win_x64

Device Information:

• Model: Femto Bolt
• Firmware Version: 1.1.2

Additional context
Setting the delay using the k4aviewer appears to work OK. My final objective is to set it using the SDK but this also seems to suffer the same problem as the Orbbec Viewer.

[zhonghong322]

For Femto Mega and Femto Bolt devices, you can configure color delay. For multi-camera synchronization configuration, please refer to this document.

https://www.orbbec.com/docs-general/set-up-cameras-for-external-synchronization_v1-2/

[DavidRobb]

I'm following these instructions, specifically Appendix IV for the Femto Bolt but

On my primary

The trigger out enable control is off and disabled. (But don't think this is an issue)

On my secondary, on opening it comes up as:

Which says Mode secondary_synced even though this is not one of the drop down options

When I change this to select Secondary and put in a value of 160us for depth delay then press write:

It says write mutli sync succeeded but changes the depth delay to 0us.

On starting the depth stream it does wait for the primary stream to also be started but the picture looks like the depth cameras are interfering (increased and pulsing noise present)

It does appear to work properly if I follow these instructions:
k4a wrapper multisync

so the k4a wrapper somehow makes it work properly.

But my objective is to get it to work from the SDK and this shows the same problem as the Orbbec Viewer. Please advise how I can make it work.

[DavidRobb]

Any comments re the above?