GCM chat application with GAE

[ANinJa via StackOverflow]

I want to make an application in android for simple chatting by implementing GCM and GAE i went through the sample code provided by google but it's only for Downstream not for Upstream when i google it,it says you have to implement the XMPP protocolall the tutorials i looked up is not matching my required half of the tutorials are created on local XMPP server with PHP whereas my domain is JAVA some of the tutorials uses C2DM which is deprecated now. can someone please share the link/page which uses this mechanism or give me a path. thanks for reading till now i have understand all the concept that i begineer should know about implementing chat application but lacking in implementation if a talk specifically i think i have to do 2 things mainly

1. send message from client application to XMPP server(HOW ?)
2. get that message from XMPP server and give it to GCM (HOW ?)

according to my knowledge for 1 i have to send data to send...@gcm.googleapis.com and for 2 i hava to implement method doPost

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