Describe the bug
I am using an MCU external hardware to trigger the Azure Kinect DK（only one camera) in theSub external sync(slaver mode), and it can be successfully triggered in the SDK. When using the [official ROS package]wired_sync_mode=0(https://github.com/microsoft/Azure_Kinect_ROS_Driver) without modifying anything, it can run. However, after changing the wired_sync_mode=2 inkinect_rgb.launch, the ROS package cannot run properly and and I encounter the error([FATAL] [1691069372.183638523]: Failed to poll cameras: node cannot continue.) shown in the screenshot.

Expected behavior
Azure Kinect DK is waiting to work until pulse trigger.

Logs
[ WARN] [1691069368.183421662]: Camera calibration file /home/yc/.ros/camera_info/azure_kinect_rgb_000863414212_1536P.yaml not found.
[ INFO] [1691069368.183456550]: using default calibration URL
[ INFO] [1691069368.183473747]: camera calibration URL: file:///home/yc/.ros/camera_info/azure_kinect_ir_000863414212_NFOV_UNBINNED.yaml
[ INFO] [1691069368.183495708]: Unable to open camera calibration file [/home/yc/.ros/camera_info/azure_kinect_ir_000863414212_NFOV_UNBINNED.yaml]
[ WARN] [1691069368.183515008]: Camera calibration file /home/yc/.ros/camera_info/azure_kinect_ir_000863414212_NFOV_UNBINNED.yaml not found.
[ INFO] [1691069368.183793842]: IMU started
[FATAL] [1691069372.183638523]: Failed to poll cameras: node cannot continue.
[k4a_nodelet_manager-4] process has finished cleanly
log file: /home/yc/.ros/log/c3e91d08-3201-11ee-922d-292bbb9d97a8/k4a_nodelet_manager-4*.log

Screenshots
If applicable, add screenshots to help explain your problem.

Desktop (please complete the following information):

• OS: [ Ubuntu]
• Version [20.04]

Additional context