{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://git.octoturge.com/Continuum/continuum-schemas/raw/branch/main/schemas/continuum/v1/edge/server_message.schema.json",
  "title": "EdgeServerMessage",
  "description": "What continuum-backend sends back down the same WebSocket. Discriminated on 'type'; snake_case for the same reason as EdgeClientMessage.",
  "oneOf": [
    {
      "type": "object",
      "title": "HelloAck",
      "properties": {
        "type": { "const": "hello_ack" },
        "session_id": { "type": "string" }
      },
      "required": ["type", "session_id"]
    },
    {
      "type": "object",
      "title": "HelloError",
      "description": "The handshake was rejected. The connection closes immediately after this.",
      "properties": {
        "type": { "const": "hello_error" },
        "message": { "type": "string" }
      },
      "required": ["type", "message"]
    },
    {
      "type": "object",
      "title": "HeartbeatAck",
      "properties": {
        "type": { "const": "heartbeat_ack" },
        "seq": {
          "type": "integer",
          "minimum": 0,
          "description": "Echoes the seq from the heartbeat being acknowledged."
        }
      },
      "required": ["type", "seq"]
    },
    {
      "type": "object",
      "title": "Command",
      "description": "Do something to one printer on this gateway. Answered with a client command_result carrying the same command_id.",
      "properties": {
        "type": { "const": "command" },
        "command_id": { "type": "string" },
        "printer_id": {
          "type": "string",
          "description": "The gateway's own printer id, not the backend UUID - the backend translates on the way out, so a gateway never has to know its printers' cloud identities."
        },
        "command": { "$ref": "./printer_command.schema.json" }
      },
      "required": ["type", "command_id", "printer_id", "command"]
    }
  ]
}