[NETCONF] Try Netopeer ( NETCONF tools )

Netopeer is a set of NETCONF tools built on the libnetconf library. 

It has single level server, multiple level server, and cli to use. 
Basically I think if we don't try, we won't truly understand what NETCONF/YANG look like and how it works. During the compilation and setup, I encounter some problems, but I find the following information that save me a lot of time to do trouble shooting.

Here is a URL about how to setup Netopeer server and to use it with cli.
http://seguesoft.com/how-to-set-up-netopeer-server-to-use-with-netconfc

This URL provides a lot of YANG Modules and examples to refer:
http://www.netconfcentral.org/

[NETCONF] The summary of NETCONF Content

The following content is about the summary of the NET-CONF web site: 

http://www.netconfcentral.org/netconf_docs

Session Initiation For Clients

   <?xml version="1.0" encoding="UTF-8"?>
          <hello xmlns="urn:ietf:params:xml:ns:netconf:base:1.0">
            <capabilities>
       <capability>urn:ietf:params:netconf:base:1.0</capability>
            </capabilities>
          </hello>]]>]]>

Protocol Capabilities

<capability>
    urn:ietf:params:netconf:capability:writable-running:1.0
</capability>

 <capability>urn:ietf:params:netconf:base:1.0</capability>

Standard Capabilities

:candidate

:confirmed-commit

:interleave

:notification

:partial-lock

:rollback-on-error

:startup

:url

:validate

:writable-running

:xpath

Configuration Databases

<running/>

<candidate/>

<startup/>

Protocol Operations

Once a NETCONF session is established, the client knows which capabilities the server supports. The client then can send RPC method requests and receive RPC replies from the server. The server's request queue is serialized, so requests will be processed in the order received.

Operation	Usage	Description
close-session	:base	Terminate this session
commit	:base AND :candidate	Commit the contents of the <candidate/> configuration database to the <running/> configuration database
copy-config	:base	Copy a configuration database
create-subscription	:notification	Create a NETCONF notification subscription
delete-config	:base	Delete a configuration database
discard-changes	:base AND :candidate	Clear all changes from the <candidate/> configuration database and make it match the <running/> configuration database
edit-config	:base	Modify a configuration database
get	:base	Retrieve data from the running configuration database and/or device statistics
get-config	:base	Retrieve data from the running configuration database
kill-session	:base	Terminate another session
lock	:base	Lock a configuration database so only my session can write
unlock	:base	Unlock a configuration database so any session can write
validate	:base AND :validate	Validate the entire contents of a configuration database

http://www.netconfcentral.org/slides/netconf/netconf_tutorial.html

NETCONF and Yang
https://www.ietf.org/proceedings/75/slides/opsarea-5.pdf
http://www.slideshare.net/cmoberg/a-30minute-introduction-to-netconf-and-yang
http://packetpushers.net/using-netconf-yang-to-configure-network-devices-and-why-it-does-not-replace-snmp/
http://packetpushers.net/using-netconf-yang-to-configure-network-devices-and-why-it-does-not-replace-snmp/