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Not quite sure how your cameras are connected, but I'm guessing since you have a script to get the serial number, you could do a udev rule instead. You can create a symlink for each camera eg /dev/camera/camera_id and your launch param just uses this symlink.

eg for Hokuyo: http://ros.org/wiki/hokuyo_node#Using_udev_to_Give_Hokuyos_Consistent_Device_Names

Not quite sure how your cameras are connected, but I'm guessing since you have a script to get the serial number, you could do a udev rule instead. You can create a symlink for each camera eg /dev/camera/camera_id and your launch param just uses this symlink.

eg for PR2 Hokuyo: http://ros.org/wiki/hokuyo_node#Using_udev_to_Give_Hokuyos_Consistent_Device_Names