By manojit , 30 January, 2017 HPL smart meter to communicate through DLMS Forums Gurux.Net Hi, I have received a HPL smart meter to communicate through DLMS. I am trying with following code GXNet cl = new GXNet(); cl.HostName = "XX.XXX.XX.XX"; // I am using IP of the meter cl.Port = 8000; cl.Protocol = NetworkType.Tcp; cl.Open(); However the Open() method throwing me following exception.