Applicable to all units. Add port range(s) to TCP Port Ranges Table.
Get operation will return the empty string.
A range is defined <start>-<end> or <start> where <start> is the Start
Port of the range and <end> is the End Port. If only <start> is specified
the range is <start>-<start>.
The value of <start> and <end> are between 0..65535.
The user can add several ranges using comma to separate between ranges.
Example: 10-256,99,987-900