def next_available_ip(num=1, exclude=[])
      post_body = {
        :num =>     num.to_i,
        :exclude => exclude
      }
      JSON.parse(connection.post(resource_uri + "?_function=next_available_ip", post_body).body)["ips"]
    end
def next_available_ip(num=1, exclude=[])
      post_body = {
        :num =>     num.to_i,
        :exclude => exclude
      }
      JSON.parse(connection.post(resource_uri + "?_function=next_available_ip", post_body).body)["ips"]
    end
Invoke the same-named function on the network resource in WAPI,
 returning an array of available IP addresses.
 You may optionally specify how many IPs you want (num) and which ones to
 exclude from consideration (array of IPv4 address strings).