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Android Cloud to Device Messaging
Android Cloud to Device Messaging (commonly referred to as Cloud to Device Messaging), or C2DM, is a defunct mobile service that was developed by Google and replaced by the Google Cloud Messaging service. It enabled developers to send data from servers to Android applications and Chrome extensions. C2DM originally launched in 2010 and was available beginning with version 2.2 of Android. Google announced official deprecation of the C2DM service on June 27, 2012. In August 2013, Google unveiled the Google Cloud Messaging service aimed at replacing C2DM, citing improvements to authentication and delivery, new API endpoints and messaging parameters, and the removal of API rate limits and maximum message sizes. The C2DM service was discontinued for existing applications and completely shut down on October 20, 2015.〔(【引用サイトリンク】title=Cloud to Device Messaging (Deprecated) )〕
==Technical details==
The C2DM service consisted of sub-services and interfaces necessary with maintaining security and reliability. When an application registered for C2DM messages and data, it received a ''C2DM Registration ID'' from the service. This identifier was unique to the application on the device, and was used to identify the device that the data or message request was intended for. This identifier was typically sent by the client application to a server owned by the developer or creator for tracking and statistical purposes. Upon sending a data or push request, the server sent an authentication request and the ''C2DM Registration ID'' of the device to the C2DM authentication service, which responded with an ''authentication token'' upon success. The third party server then submitted both identifiers within the final data request to be enqueued and sent to the device. When the device received the information from the C2DM, the request was removed from the C2DM queue.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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