websocket.messages_received not displayed in stats

[BalzySte]

Artillery fails to caputure websocket responses and display the messages_received count and rate

Version info:

Artillery: 2.0.6
Node.js:   v21.5.0
OS:        linux

Running this command:

artillery run test.yml

I expected to see this happen:

I expected to see the following stats on top of all the others

websocket.messages_received
websocket.receive_rate

The websocket (wss://echo.websocket.org) echoes back as expected, verified with Postman.

Instead, this happened:

All VUs finished. Total time: 26 seconds

--------------------------------
Summary report @ 14:30:24(+0530)
--------------------------------

vusers.completed: .............................................................. 200
vusers.created: ................................................................ 200
vusers.created_by_name.My WebSocket test: ...................................... 200
vusers.failed: ................................................................. 0
vusers.session_length:
  min: ......................................................................... 4326
  max: ......................................................................... 4588.5
  mean: ........................................................................ 4382.4
  median: ...................................................................... 4403.8
  p95: ......................................................................... 4492.8
  p99: ......................................................................... 4583.6
websocket.messages_sent: ....................................................... 400
websocket.send_rate: ........................................................... 20/sec
artillery run test.yml  11.56s user 1.19s system 43% cpu 29.190 total

Files being used:

test.yml configuration

config:
  target: "wss://echo.websocket.org"
  phases:
    - duration: 20
      arrivalRate: 10
  ws:
    # Set WebSocket subprotocols:

scenarios:
  - name: My WebSocket test
    engine: ws # Enable the Socket.io engine
    flow:
      - send: "Hello world!"
      - think: 3
      - send: "Booo"
      - think: 1

Others:
On top of that, debug messages printed with DEBUG=ws artillery run test.yml only shows SENT messages. There's no mention of RECEIVED messages.