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23 changes: 23 additions & 0 deletions specs/volqfelko/PROTOCOL.md
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* What transport protocol do we use?<br>
TCP
* How does the client find the server (addresses and ports)?<br>
The client will contact server on port 2021 on my computer IP address (where the app is running) <br>
The server will be listening on port 2021 with my computer IP address (where the app is running)

* Who speaks first?<br>
The client will ask the server
* What is the sequence of messages exchanged by the client and the server? (flow)<br>
Client : send a message to ask if srv up<br>
Server : **listening**, receive the message and respond ready<br>
Client : receive response from server<br>

* What happens when a message is received from the other party? (semantics)<br>
Check if message OK, then treat it
* What is the syntax of the messages? How we generate and parse them? (syntax)<br>
OPERATION NUMBER1 NUMBER2<br><br>
OPERATIONS : ADD, DIV, MULT, SUB, q <br>
NUMBERS : int format <br>
everything separate with SPACES

* Who closes the connection and when?<br>
Client with stop msg then the server follow client instruction