Friend Service "frd:u"

Command Header	Description
0x00010000	HasLoggedIn
0x00020000	IsOnline
0x00030002	Login
0x00040000	Logout
0x00050000	GetMyFriendKey
0x00060000	GetMyPreference
0x00070000	GetMyProfile
0x00080000	GetMyPresence
0x00090000	GetMyScreenName
0x000A0000	GetMyMii
0x000B0000	GetMyLocalAccountId
0x000C0000	GetMyPlayingGame
0x000D0000	GetMyFavoriteGame
0x000E0000	GetMyNcPrincipalId
0x000F0000	GetMyComment
0x00100040	GetMyPassword
0x00110080	GetFriendKeyList
0x00120042	GetFriendPresence
0x00130142	GetFriendScreenName
0x00140044	GetFriendMii
0x00150042	GetFriendProfile
0x00160042	GetFriendRelationship
0x00170042	GetFriendAttributeFlags
0x00180044	GetFriendPlayingGame
0x00190042	GetFriendFavoriteGame
0x001A00C4	GetFriendInfo
0x001B0080	IsIncludedInFriendList
0x001C0042	UnscrambleLocalFriendCode
0x001D0002	UpdateGameModeDescription
0x001E02C2	UpdateGameMode
0x001F0042	SendInvitation
0x00200002	AttachToEventNotification
0x00210040	SetNotificationMask
0x00220040	GetEventNotification
0x00230000	GetLastResponseResult
0x00240040	PrincipalIdToFriendCode
0x00250080	FriendCodeToPrincipalId
0x00260080	IsValidFriendCode
0x00270040	ResultToErrorCode
0x00280244	RequestGameAuthentication
0x00290000	GetGameAuthenticationData
0x002A0204	RequestServiceLocator
0x002B0000	GetServiceLocatorData
0x002C0002	DetectNatProperties
0x002D0000	GetNatProperties
0x002E0000	GetServerTimeInterval
0x002F0040	AllowHalfAwake
0x00300000	GetServerTypes
0x00310082	GetFriendComment
0x00320042	SetClientSdkVersion
0x00330000	GetMyApproachContext
0x00340046	AddFriendWithApproach
0x00350082	DecryptApproachContext

"frd:n"

This contains a similar (probably the same) command handler from 0x0001.... to 0x002F.... as them in frd:u. In addition, it also contains

Command Header	Description
0x04050000	Used in creating the user Mii. No cmdbuff parameters.
0x04060042	AddFriendOnline
0x04090100	RemoveFriend
0x040B00C0	UpdatePrefrences
0x040C0800	Used in creating the user Mii. 128-byte struct as cmdbuff parameters.

No RootCertChain(s) are used. For the nasc site, friends-module uses HTTPC:AddDefaultCert with the following certIDs: 0x1, 0x2, and 0x3.