Serial numbers starting with 0

[grimmmyshini]

For camera with serial numbers starting with 0, this node is not able to find them since the type of serial number is int and hence an integer with starting 0 is always converted to octal. This integer representation is fine as long as only one camera is on board as it is found by default but with a multi camera setup, this is a bit problematic.

A possible fix is to convert the serial number parameter to type string.