Echelon OpenLDV User Manual download pdf (Page 181)

OpenLDV Programmer’s Guide 173

Table 59. SetAdditionalDownlinkPacketHeader Parameters

Parameter Description

hexBytes Hexadecimal string containing the bytes to be pre-pended, as pairs of

hexadecimal digits. For example: 0B0C0D0E0F10.

Returns

Standard COM HRESULT describing the result of the call. Returns

E_ACCESS_DENIED if field is presently read-only. Table 48 on page 166 lists

each SCO field, along with when these fields are read-only.

SetAdditionalDownlinkPacketTrailer Method

Applies to: Session Control Object

This method sets any additional bytes to append to every packet trailer sent

during a downlink session. Normally this field is an empty string (the default).

Developers of lookup extensions can set this field to specify a series of bytes that

are to be appended to the end of every packet used in a downlink session if there

is an intermediate proxy between the OpenLDV application and the RNI. These

bytes can be used to provide routing information the proxy might require.

Syntax

C++ STDMETHOD(SetAdditionalDownlinkPacketTrailer)(BSTR hexBytes)

Visual Basic Sub SetAdditionalDownlinkPacketTrailer(ByVal hexBytes As String)

Table 60. SetAdditionalDownlinkPacketTrailer Parameters

Parameter Description

hexBytes Hexadecimal string containing the bytes to be appended, as pairs of

hexadecimal digits. For example: 0B0C0D0E0F10.

Returns

Standard COM HRESULT describing the result of the call. Returns

E_ACCESS_DENIED if the field is presently read-only. Table 48 on page 166

lists each SCO field, along with when these fields are read-only.

SetAuthenticationFlag Method

Applies to: Session Control Object

This method sets the flag that determines whether xDriver should use link

authentication with an MD5 per-packet digest for the session. The lookup

extension component sets this value depending on the RNI used.

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Echelon OpenLDV User Manual Page 181