Emit ws:probe

Client -> server liveness probe. Emit with an acknowledgement callback; the server acks immediately with no payload.

Client emits ws:probe (any/no data) using socket.io acks, e.g. socket.timeout(2000).emit('ws:probe', null, (err) => ...). A missing ack means the connection is stale and should be torn down. Nothing is emitted by the server other than the ack.

Payload: ws:probe

Acknowledgement only; the server sends no payload.

Type: object