Ping / Pong

The simplest request/response pair. Send ping, receive pong. Use it as a keepalive or to verify the connection is active.

Request: `ping`

{
  "type": "ping",
  "requestId": "health-check-1"
}

Field	Type	Required	Description
`type`	`"ping"`	yes	Message type discriminator
`requestId`	`string`	no	Echoed back on the response for correlation

{
  "type": "pong",
  "requestId": "health-check-1",
  "ts": "2025-01-15T10:30:00.000Z"
}