What are the correct steps to initiate the session and send a message to LiveAgent through REST API?

I'm trying to send some messages through API but can not succeed. Regarding to the documentation http://www.salesforce.com/us/developer/docs/live_agent_rest/live_agent_rest.pdf I am trying to execute the following calls:

1.     Request SessionId
2.     Create a Chat Visitor Session (call Chasitor/ChasitorInit)
3.     Send a Message (call ChatMessage)

But in the LiveAgen Console in the org I do not see any chat request and any messages. Am I miss some step/call?

Hi,

 

I have a Developer org account. It's showing summer 13 version.How can i update to Winter 14 or future(new) releses (Or) Does Saleforce.com automatically updates the Developer org?

 

Thanks.........