socket: can be used for process communication between different devices
1. TCP communication protocol
1. IP
2, port
3, connection-oriented protocol, providing reliable service
1) Stop waiting
2) Timeout retransmission
3) Flow control
4) Congestion control
5) Data packet verification
6) Reorder out-of-sequence data packets
7) Response Mechanism
8) Drop Duplicate Data
4. Three-way handshake and four-way handshake
5. Server
1) clientId
2) Each client connection status
3) Only point-to-point unicast mode is supported
4) Receive client data and obtain its clientId, etc.
5) Actively disconnect from the target client
6) Keep-alive timing: reset the timer every time you interact with the client, and send a probe message if no client information is received within two hours
6. Client
1) is actively disconnected by the Server
Two, UDP
1.IP
2.port
3. No connection protocol, does not provide reliable interaction
4. Support unicast, multicast, broadcast
3. Realize the upper layer of socket
1、Ftp
2、http
4. Processing of sticky packets and subpackages of TCP Socket
Reference blog post:
TCP/UDP column
TCP subcontracting method && sticky packet processing strategy
tcp forced subcontracting_[TCP/IP] Diagram of TCP communication mechanism
F:\4. Cainiao Famous Enterprise Dream\1.C++ R&D Engineer_Classic\12.Socket
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