![]() client : for example pc WeChat, mobile phone qqĮntrance level gate: Keep the connection with the client.A typical instant messaging architecture can be abstracted into several layers :.How about a typical instant messaging architecture ? ![]() Voice over : Wechat only supports “ Multi sign on ” Send and receive online messages at the same time, And the latest news “ Message roaming ”, Not implementing all messages “ roaming ”. Log in to any instance of any terminal, Can pull all historical chat messages, This is message roaming. Voice over : It should be noted that, A client can only log in to one instance, For example, the same QQ Number, stay pc1 On the login, Until then pc2 On the login, The latter will kick the former out ,pc1 Will receive notice “ You've logged in elsewhere xxoo”. Take wechat as an example, Sure PC End ,phone Login at the same time, Sending and receiving messages at the same time. It's a matter of multi sign on and message roaming. Can wechat realize, Change to a cell phone, We can still get historical news ?.How does wechat realize mobile phone 、PC Login at the same time, At the same time, I'll get the message ?.
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