I can't see any changes in focus when running the ROS driver. I also tried setting manual focus and there don't seem to be any difference between value of 0 and 255.
When I run
import depthai as dai
with dai.Device() as device:
print(device.getConnectedCameraFeatures())
it outputs:
[{socket: CAM_A, sensorName: IMX214, width: 4208, height: 3120, orientation: AUTO, supportedTypes: [COLOR], hasAutofocus: 0, hasAutofocusIC: 1, name: color}]