Google's GCM Cloud Connection Server

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Googles GCM Cloud Connection Server
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Googles Cloud Connection Server A Brief Intro

• Connection Server based on XMPP(Extensible
  Messaging and Presence Protocol)
• Allows third party app servers to communicate
  with Android devices
• Uses a persistent TCP connection for
  communication
• Communication is asynchronous and bi-directional
• This XMPP mechanism for sending messages can be
  used alongside traditional HTTP

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More Info on XMPP

• Founded and used by Jabber for instant messaging
• Is an XML based communication protocol
• XMPP is open source, which means any developer
  can customize its extensions to suit software
  requirements.
• IM Services such as Google Talk and the chat
  feature in Facebook use XMPP in the back-end
  though not a native implementation
• Initially, Transmission Control Protocol (TCP)
  which is native to XMPP was used for
  communications. Later, XMPP was developed to
  perform data transfers via HTTP for web clients
  and via web-sockets for real-time messaging.
• The native design of the XMPP server component
  has an in-built entity called transports or
  gateways that aids the communication of
  messages between XMPP and non-XMPP systems.

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How XMPP uses HTTP for communication

• XMPP uses HTTP in two ways  
• Polling
• Where data transfer is done through HTTP POST and
  GET methodologies
• Is now deprecated 
• Binding
• used for data PUSH methodologies
• Implemented over Bidirectional-streams Over
  Synchronous HTTP (BOSH)
• This push model of notification is more efficient
  than polling, where many of the polls return no
  new data

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How CCS has improved on GCM

• CCS uses the XMPP protocol over a long-lasting
  TCP connection for communications
• Now, CCS performs both device-to-cloud and
  cloud-to-device communications (through XMPP)
  over the same connection (TCP) and thereby helps
  developers achieve a better device power
  management in their apps than GCM
• CCS requires a Transport Layer Security (TLS)
  connection and Simple Authentication and Security
  Layer (SASL)-based authentication. 
• CCS incorporates JSON-based payload messages into
  the XMPP-supported XML structure and uses it for
  communications. CCS could send up to 1000 such
  messages asynchronously before it receives any
  acknowledgement from the device.

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