How to construct KAS-ECC: fixedInfo

[ylu0926]

When the following information are given, can someone show me what is used as the uPartyInfo and what is used as the vPartyInfo? And finally, what will the fixedinfo be?

{
"scheme": "ephemeralUnified",
"kasRole": "initiator",

        "l": 512,
        "iutId": "A1B2C3D4E5",
        "serverId": "1234567890"
                                 
            "fixedInfoPattern": "algorithmId||l||uPartyInfo||vPartyInfo",
            "fixedInfoEncoding": "concatenation",

}
{
"ephemeralPublicServerX": "D82BF11DF13099B29A202A16164CFCC886D9F3379872D81DD242BD45",
"ephemeralPublicServerY": "998ADDF1842E863D80419D26D8C17A1E7B0561BAFBFBE7F9DB79645A",
"ephemeralPrivateIut": "16EBCF989415F3E864E2E24D4E46E0C0435239471352A96DFB3903B9",
"ephemeralPublicIutX": "E90B9175D19B14DD90BE3CA4613E316FA11CD13821052475FEC5CDAB",
"ephemeralPublicIutY": "00A20BB68E0FB75FF8E7FE9DC2FCAFAB36495428239FD312DF7A78EC",
"tcId": 1,
"kdfParameter": {
"kdfType": "twoStep",
"salt": "00000000000000000000000000000000000000000000000000000000",
"algorithmId": "3B9456AE"
},

My understanding is that the uPartyInfo is the "serverId" and the vPartyInfo is the "iutId".
So the final fixedinfo would be
"algorithmId||l||uPartyInfo||vPartyInfo",= "3B9456AE000002001234567890A1B2C3D4E5”
Here :
"algorithmId": "3B9456AE"
“l’: “00000200” 512 as 32 bits
“uPartyInfo”= "serverId": "1234567890"
“vPartyInfo”= "iutId": "A1B2C3D4E5",

Or the uPartyInfo needs to include server public key?
Thanks.