:sig
bool ws_send_to(String connection_id, String message, bool binary = false)

:params
connection_id : ID of the target WebSocket client
message : message payload to send
binary : set to true to send a binary frame instead of a text frame
return value : true if the target connection exists and the message was queued

:see
>websocket

:content
Queues a WebSocket message for one specific connected client.

Related:

- PHP: WebSocket connection metadata and send APIs in Ratchet, Workerman, or similar server frameworks
- JavaScript / Node.js: browser `WebSocket` properties and Node `ws` server-side connection inspection and send methods