Echelon OpenLDV - Manual (Page 111)

OpenLDV Programmer’s Guide 103
Call ObjectServer.open()
Does the network
exist?
Get the network from Local network collection
Add the network to the network collection No
Call myNetwork.open()
Open System Object.
Set NetworkServiceDevice.NetworkInterface to desired xDriver
networkInterface e.g. “x.[profileName].[DownlinkLookupKey]”
Code ILdvxConfigure.SetInstance() to return S_OK
(This optional method is fired once in the lifetime of an Instance)
Code ILdvxConfigure.SetOptions() to return S_OK
(This optional method is fired once in the lifetime of an Instance)
Code ILdvxLookup.DownlinkLookup() to:
Call xSCO.GetDownlinkKey()
Do an external database query using the retrieved DownlinkKey
If (query Result = NULL) then
Exit by returning an appropriate COM error i.e. E_HANDLE
Else
Call xSCO.SetAuthenticationFlag([Recommended: True]|[False])
Call xSCO.SetCurrentAuthenticationKey([a])
Call xSCO.SetNextAuthenticationKey(a|b)
Define ILdvxSCO_TCPPtr pxSCO_TCP(pxSCO)
Call xSCO_TCP.SetRemoteTCPAddress("x.x.x.x")
Call xSCO_TCP.SetRemoteTCPPort(n)
return S_OK
Do Network and Monitoring Task(s)
If Not myNetwork.IsOpenIndependent Then Close System Object
If Not myNetwork.IsOpenIndependent Then myNetwork.close()
Else myNetwork.CloseIndependent()
Other networks to
open?
Call ObjectServer.close()
No
Define network to be opened
Typical Downlink Scenario
Open network in Local or
serverIndependant mode?
Local
Yes
Yes
Indp. Get network from MyVNI network collection
Call myNetwork.OpenIndependent()
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xDriver Lookup Extension Component called.
Figure 15. Typical Downlink Session for LNS Server