Y3WS websocket protocol for card I/O for the Taisen series by Haruka:

Default listening port: 3594 (san-go-ku-shi)

All packets are JSON and, unless otherwise specified contain these fields:

* Requests:
{"version": 1, "command": "..."}

* Responses:
{"version": 1, "success": <bool>, "error": <null/string>}

Commands:

- ping

Does nothing except answering with a success response.


- get_game_id

Extra response fields:
 - game_id: <string>

Returns the current game ID that is being run (SDDD, SDGY).


- get_cards

Extra response fields:
 - cards: <array of objects>
   - card_id: <long>
   - path: <string>

Returns all cards that the player has in possession.


- get_card_image

Extra request fields:
 - path: <string>
Extra response fields:
 - data: <base64 encoded string>

Returns the card image for the given path (format TBA).


- set_field

Extra request fields:
 - array of objects
   - card_id: <long>
   - x: <float>
   - y: <float>
   - rotation: <float>

Sets the given cards onto the given positions on the field. Always replaces the entire board.