Echelon OpenLDV User Manual download pdf (Page 121)

OpenLDV Programmer’s Guide 113

Table 36. Changing Authentication Keys

Phase One, Lookup Extension Component Is Called

Initially, the current authentication key must match the authentication key configured into the RNI for

the connection to be established. The authentication key fields start with the following values:

RNI Authentication Key ABCD

SCO Current Authentication Key ABCD

SCO Next Authentication Key EFGH

Current Authentication Key in the Database ABCD

Next Authentication Key in the Database EFGH

Phase Two, RNI’s Key Updated

Because the current and next authentication keys filled into the SCO differ, the authentication key

configured into the RNI is incremented so that it matches the next authentication key (EFGH). In

addition, the current authentication key stored in the SCO is updated to match the next authentication

key. The authentication key fields now have the following values:

RNI Authentication Key EFGH

SCO Current Authentication Key EFGH

SCO Next Authentication Key EFGH

Current Authentication Key in the Database ABCD

Next Authentication Key in the Database EFGH

Phase Three, Update Lookup Method Called

The UpdateLookup method is called after the authentication key configured into the RNI, and the

current authentication key in the SCO, have been changed. This method must update the database so

that it is updated with the new values of the current authentication key and the next authentication

key from the SCO. The current and next authentication keys must always be stored in the database,

and can be updated only when the UpdateLookup method is called.

The next time there is a session with this RNI, the lookup extension will fill in the proper value for the

current authentication key. After update lookup has been called, the authentication key fields should

have the following values:

RNI Authentication Key

EFGH

SCO Current Authentication Key

EFGH

SCO Next Authentication Key

EFGH

Current Authentication Key in the Database EFGH

Next Authentication Key in the Database EFGH

Creating a Custom Lookup Extension in C++

This section describes the procedure for creating the framework for a custom

lookup extension component in C++ using Microsoft Visual Studio 2008. Use a

similar procedure for Microsoft Visual Studio 2010, or later releases.

1 2 ... 116 117 118 119 120 121 122 123 124 125 126 ... 193 194

No comments

Echelon OpenLDV User Manual Page 121