I've HLS as "77777777777777777777777777777777" in hex "wwwwwwwwwwwwwwww" in ASCII but when I send via gurux or any other meter reading software i.e. kalki, the CallingAuthentication Value changed it into "0F286E004D6C3C291564560557271D11". I know its a CtoS challenge for pass1 but how hls is converted to this string, or I should say from which encryption method it is encrypted that I didn't understand. I'm trying to establish client id 48 of a smart energy meter. and If any one can provide me a document where after pass1, how to create data for pass3 then it would be very handy. thanks in advance.