How is a client (cellphone) is located by the server in push email. Does it require an active TCP connection to be maintained by the client ? Does the client need to have a public IP for that ?
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How is a client (cellphone) is located by the server in push email. Does it require an active TCP connection to be maintained by the client ? Does the client need to have a public IP for that ?
The cellphone must maintain an open connection to the server – almost all cells are behind one or more layers of NAT gateways, making it impossible for the server to reach out to the client unless the client has opened a connection and kept it open.