+ return "ERROR NOT_GRID\r\n";
+
+ /* 3.3. Global command errors */
+
+ /* 3.4. Game management errors */
+ case TTT_ERROR_NO_INVITE:
+ return "ERROR NO_INVITE\r\n";
+ case TTT_ERROR_NO_GAME:
+ return "ERROR NO_GAME\r\n";
+
+ /* 3.5. User information errors */