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104 Extending xDriver
The events shown in Figure 15 that occur within the LNS application represent
a typical LNS application that opens a downlink session. Your application can
vary from these steps.
In addition, the events that occur within the lookup extension component in the
flow chart represent the minimal tasks that a lookup extension component must
perform during a downlink session. This flow chart refers to the methods that
you can use when programming your custom lookup extension component. For
more information about these methods, see Appendix C, Custom Lookup
Extension Component Programming, on page 161.
Uplink Sessions
An xDriver session is considered an uplink session if an RNI initiates the session
by requesting a connection to an OpenLDV application. This request for
connection is usually caused when the RNI receives a message with a qualifying
message code.
For xDriver to receive the request, the xDriver Connection Broker must be
running. For information about the xDriver Connection Broker, see Starting the
Connection Broker on page 135.
There must also be at least one xDriver profile with uplink session handling
enabled for xDriver to receive the uplink session request. You can use the
OpenLDV xDriver Profile Editor to create an xDriver profile that has uplink
session handling enabled. Using the Profile Editor, you can assign the profile a
port, which the Connection Broker uses to listen for uplink session requests. The
profile handles all uplink session requests on that port. For more information
about xDriver profiles and the xDriver Profile Editor, see xDriver Profiles on page
134.
Figure 16 shows the application flow for a downlink session.
User Application
7
x.Profile.RNI
Lookup ExtensionConnection Broker
OpenLDV
Application
1
3
2
6
4 5
Database
SmartServer
SmartServer
Figure 16. Uplink Session Overview
The application flow for an uplink session includes the following steps (see
Figure 16):
1. An RNI (for example, a SmartServer) requests an uplink session. When
the request for connection is made, the Connection Broker receives an
- OpenLDV 1
- Programmer’s Guide 1
- Welcome 3
- Audience 3
- Examples 4
- Related Documentation 4
- Table of Contents 5
- Introduction 9
- ONWORKS network: 10
- OpenLDV Driver 11
- Client Applications 11
- Network Interfaces 12
- Installing the OpenLDV SDK 14
- Using the OpenLDV API 17
- ONWORKS network 18
- Application Layer 20
- Presentation Layer 21
- Overview of the OpenLDV API 21
- The OpenLDV API 23
- ONWORKS interface device 24
- ONWORKS name (such as 24
- LDVDevices Structure 46
- LdvCombineFlags Enumeration 47
- LdvDeviceCaps Enumeration 48
- LDVDriverInfo Structure 50
- LdvDriverID Enumeration 51
- LdvDriverType Enumeration 52
- OpenLDV API Return Codes 53
- ONWORKS Interfaces 57
- msgSize); 62
- Constructing Messages 66
- Application Buffer Structure 66
- Layer 2 Buffer Structure 69
- Application Layer Header 69
- Layer 2 Header 69
- Layer 5 Buffer Structure 70
- Message Header 70
- ExpMsgHdr 71
- NetVarHdr 73
- ONWORKS transceivers 74
- Network Address 75
- RcvAddrDtl 78
- RespAddrDtl 80
- Message Data 81
- UnprocessedNV 82
- ExplicitMsg 82
- Downlink Commands 84
- Uplink Commands 85
- Immediate Commands 85
- Network Interface Commands 85
- Common Definitions 98
- Dispatchers 98
- Toolkits and User Interface 99
- Developer Example Diagram 100
- ONWORKS 101
- LNS Applications for xDriver 106
- Extending xDriver 107
- Downlink Sessions 108
- 102 Extending xDriver 110
- Typical Downlink Scenario 111
- Uplink Sessions 112
- ONWORKS network, in a 114
- Typical Uplink Scenario 115
- Session Control Object 116
- Authentication Key Handling 119
- ONWORKS \xDriver\Components 123
- Add a COM Object 124
- Test the Lookup Extension 132
- Optional Steps 132
- Add a COM Class 135
- LNS Programming with xDriver 145
- ONWORKS networks 147
- ONWORKS networks by 148
- Uplink Sample Application 150
- Custom Network Interfaces 155
- Overview 156
- Windows Registry Entries 158
- LNS Methods and Events for 161
- AcceptIncomingSession 162
- Remarks 162
- BeginIncomingSessionEvents 163
- EndIncomingSessionEvents 163
- NetworkInterfaces.Item( ) 164
- Syntax 164
- OnIncomingSessionEvent 165
- ReleasePendingUpdates 166
- Custom Lookup Extension 169
- Component Programming 169
- ILdvxConfigure Interface 170
- SetInstance Method 170
- Returns 171
- SetOptions Method 171
- ILdvxLookup Interface 172
- DownlinkLookup Method 172
- UpdateLookup Method 173
- UplinkLookup Method 173
- ILdvxSCO Interface 174
- GetDownlinkKey Method 177
- GetUplinkKey Method 180
- SetAuthenticationFlag Method 181
- SetDownlinkKey Method 183
- SetEncryptionType Method 183
- SetLNSNetworkName Method 184
- SetUplinkKey Method 186
- ILdvxSCO_TCP Interface 186
- GetRemoteTCPAddress Method 187
- GetRemoteTCPPort Method 187
- SetRemoteTCPAddress Method 188
- SetRemoteTCPPort Method 188
- ILdvxSCO2 Interface 189
- GetNeuronID Method 189
- 184 Index 192
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