How to encode authentication mechanism name as octet string in AssociationLogicalName

Hi,

I am trying to enable/disable HLS security on E360 meter from Landis. I am having troubles with how to generate correct frame for GXDLMSAssociationLogicalName object. I am trying to write "AuthenticationMechanismName" (attribute 6) to the meter but I would need to encode it not as a struct but as an octet string, could you help me with that?

This is an output frame that I am currently getting:
C104C102000F0000280002FF0600004000002B0000FF0200020207110211101202F411051108110211011600

And this is how I achieved the above frame (in c# .net)
var associationLn = new GXDLMSAssociationLogicalName(logicalNameAssociation);
associationLn.AuthenticationMechanismName = new GXAuthenticationMechanismName
{
MechanismId = Authentication.Low,
};
var securitySetup = new GXDLMSSecuritySetup(logicalNameSecurity, shortNameSecurity)
{
};
securitySetup.SecurityPolicy |= SecurityPolicy.None;

var toWriteList = new List<KeyValuePa ir<GXDLMSObject, int>>
{
new (associationLn, 6),
new (securitySetup, 2)
};

var toWrite = _context.Client.WriteList(toWriteList);

This is a frame example that I would need to send to the meter for which I don't know how can I generate it with gurux library:
C104C002000F0000280002FF0600004000002B0000FF0200020907608574050802011600

I currently use version 9.0.2312.1401 of Gurux.DLMS nuget package.