Update API

doc/api.org

@@ -4,8 +4,14 @@
 #+LATEX_HEADER: \usepackage{fullpage}
 
 * General Description
-  - All transmissions will be based on UDP
-  - All UDP packet will contain plain json data
+  - All transmissions will be based on TCP because:
+    - Packet length are not fixed
+    - Packet ordering is important
+  - All TCP stream from *client to server* will:
+    - Contain plain json data
+    - Be terminated by a "#EOF" line (in order for the server to detect the end of the request
+  - All TCP stream from *server to client* will contains plai json data (connection will be closed by the server
+    so there is no need of "#EOF".
 * Communications 
 ** Initialisation
    1. Server wait for a client
@@ -14,36 +20,33 @@
         {
             "type": "new-game"
         }
+        #EOF
       #+END_SRC
    3. Server can reply:
       #+BEGIN_SRC json
         {
             "type": "state",
-            "syn": 1,
             "game-id": 1,
             "game-over": false,
             "snake": [[1,2],[1,3]],
             "food": [[6,7]]
         }  
       #+END_SRC
-      Note that, syn entry is used to keep packet ordering consistent and detecting packet inversion on the network. Thus,
-      syn entry indicate the expected syn that the client should send on the next UDP packet.
 ** Gameplay
 *** Change Direction
     1. When client is playing a game it can ask to the server to change snake direction:
        #+BEGIN_SRC json
          {
              "type": "update",
-             "syn": 1,
              "game-id": 1,
              "direction": "left",
          }
+         #EOF
        #+END_SRC
     2. Server can reply
        #+BEGIN_SRC json
          {
              "type": "state",
-             "syn": 2,
              "game-id": 1,
              "game-over": false,
              "snake": [[0,2],[1,2]],
@@ -55,16 +58,15 @@
        #+BEGIN_SRC json
          {
              "type": "update",
-             "syn": 2,
              "game-id": 1,
              "direction": null
          }
+         #EOF
        #+END_SRC
     2. Server can reply:
        #+BEGIN_SRC json
          {
              "type": "state",
-             "syn": 3,
              "game-id": 1,
              "game-over": false,
              "snake": [[1,2],[0,2]],
@@ -76,11 +78,10 @@
        #+BEGIN_SRC json
          {
              "type": "state",
-             "syn": null,
              "game-id": 1,
              "game-over": true,
              "snake": [[0,2],[1,2]],
              "food": [[6,7]]
          }  
        #+END_SRC
-    - No reply is expected from the client and server will be in charge to free local memory. Note that syn=null.
+    - No reply is expected from the client and server will be in charge to free local memory.