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Notification device example

This NETCONF device example shows how NETCONF device is customized to publish notifications from the device. Device uses lighty-test-notifications@2018-08-20.yang YANG model located in examples/models/lighty-example-notifications-model. Therefore, the name: notifications device.

Usage

Device uses TriggerNotificationProcessor class to handle incoming triggerDataNotification RPC which implies publishing notification DataNotification. triggerDataNotification RPC and dataNotification notification are described in YANG file. Check commands in Notifications device model on how to trigger publishing dataNotification notification.

Build and run

Build root project - for more details check: README

Run device

  • extract binary distribution lighty-notifications-device-21.0.0-SNAPSHOT-bin.zip from target directory
  • run jar file from zip with default parameter
java -jar lighty-notifications-device-21.0.0-SNAPSHOT.jar

To run device on specific port, add port number as an argument

  • run device on specific port 12345 (any available port)
java -jar lighty-notifications-device-21.0.0-SNAPSHOT.jar 12345

Connect to device via SSH

Open session

To connect to a device via SSH, run command

ssh admin@127.0.0.1 -p 12345 -s netconf

where

  • admin is default username of a device with password admin(no other users)
  • 127.0.0.1 is the local IP address of the machine where device is running
  • -p 12345 is port number of running device, default is 17830
  • -s netconf option establishes the NETCONF session as an SSH subsystem, which means that NETCONF can be used in terminal through opened SSH session

To complete connection with a device, it is necessary to initiate handshake by sending client's model capabilities in hello-message:

<hello xmlns="urn:ietf:params:xml:ns:netconf:base:1.0">
    <capabilities>
        <capability>urn:ietf:params:netconf:base:1.0</capability>
    </capabilities>
</hello>
]]>]]>

which informs the device which capabilities the client supports. The capabilities tag contains list of capabilities the client supports, e.g.

<hello xmlns="urn:ietf:params:xml:ns:netconf:base:1.0">
    <capabilities>
        <capability>capability1</capabaility>
        <capability>capability2</capabaility>
        <capability>capability3</capabaility>
        ...
    </capabilities>
</hello>
]]>]]>

If handshake is not completed by sending hello message with client's capabilities and any other message is sent, following error message is received (long text replaced with ...):

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<rpc-reply xmlns="urn:ietf:params:xml:ns:netconf:base:1.0">
    <rpc-error>
        <error-type>rpc</error-type>
        <error-tag>malformed-message</error-tag>
        <error-severity>error</error-severity>
        <error-message>
            java.lang.IllegalStateException: Hello message not received, instead received: ...
        </error-message>
        <error-info>
            <cause>
                java.lang.IllegalStateException: Hello message not received, instead received: ...
            </cause>
        </error-info>
    </rpc-error>
</rpc-reply>
]]>]]>

Close session

To properly exit current NETCONF device SSH session, close-session message needs to be send

<rpc message-id="cs1" xmlns="urn:ietf:params:xml:ns:netconf:base:1.0">
    <close-session/>
</rpc>
]]>]]>

ok message will be replied and then closed the session.

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<rpc-reply xmlns="urn:ietf:params:xml:ns:netconf:base:1.0" message-id="cs1">
    <ok/>
</rpc-reply>

Basic NETCONF commands

Notification device supports all basic NETCONF commands, but as far as this device does not contain any other YANG model with root containers, this device will not be able to store or modified data device manages. This device tries to describe usage of NETCONF notifications, only. For detailed description, find more details in topology-device or toaster-device projects.

Trigger and receive notification

YANG model used by the device is lighty-test-notifications@2018-08-20.yang.

Notifications device has only one RPC defined in YANG model:

triggerDataNotification

  • takes 4 mandatory parameters: ClientId, Count, Delay and Payload

To trigger RPC with client ClientId: 0, Count: 5, Delay: 500 and Payload: just simple notification, call triggerDataNotification RPC

<rpc message-id="nt1" xmlns="urn:ietf:params:xml:ns:netconf:base:1.0">
    <triggerDataNotification xmlns="yang:lighty:test:notifications">
        <ClientId>0</ClientId>
        <Count>5</Count>
        <Delay>500</Delay>
        <Payload>just simple notification</Payload>
    </triggerDataNotification>
</rpc>
]]>]]>

Log info message after triggering triggerDataNotification RPC: INFO [nioEventLoopGroup-2-3] (TriggerNotificationProcessor.java:82) - triggering notifications: clientId=0 5 delay=500ms, payload=just simple notification INFO [nioEventLoopGroup-2-3] (TriggerNotificationProcessor.java:71) - sending notification clientId=0 1/5

Triggered triggerDataNotification RPC publishes notification DataNotification, so any other listener device subscribed to notifications by create-subscription message, will receive notification message, example:

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<notification xmlns="urn:ietf:params:xml:ns:netconf:notification:1.0">
    <eventTime>2020-09-04T14:56:15Z</eventTime>
    <dataNotification xmlns="yang:lighty:test:notifications">
        <Ordinal>5</Ordinal>
        <Payload>just simple notification</Payload>
        <ClientId>0</ClientId>
    </dataNotification>
</notification>
]]>]]>

which contains input parameters of called triggerDataNotification RPC, in this case Ordinal(Count): 5, ClientId: 0 and Payload: just simple notification.

Subscribe on notification

To receive notifications on NETCONF listener device, subscribe for notification by sending create-subscription message:

<rpc message-id="101" xmlns ="urn:ietf:params:xml:ns:netconf:base:1.0">
    <create-subscription xmlns="urn:ietf:params:xml:ns:netconf:notification:1.0">
    </create-subscription>
</rpc>
]]>]]>