Join room using HTTP call return "ack" only

General
1

Hi, I have a room like this:

{
    "janus": "success",
    "session_id": 266646464364358,
    "transaction": "MUcPg6Wu5jhr",
    "sender": 4377145860586972,
    "plugindata": {
        "plugin": "janus.plugin.videoroom",
        "data": {
            "videoroom": "success",
            "list": [
                {
                    "room": 11,
                    "description": "Room 11",
                    "pin_required": false,
                    "is_private": false,
                    "max_publishers": 3,
                    "bitrate": 0,
                    "fir_freq": 0,
                    "require_pvtid": false,
                    "require_e2ee": false,
                    "dummy_publisher": false,
                    "notify_joining": false,
                    "audiocodec": "opus",
                    "videocodec": "vp8",
                    "opus_fec": true,
                    "record": false,
                    "lock_record": false,
                    "num_participants": 0,
                    "audiolevel_ext": true,
                    "audiolevel_event": false,
                    "videoorient_ext": true,
                    "playoutdelay_ext": true,
                    "transport_wide_cc_ext": true
                }
            ]
        }
    }
}

Now I want to join this room, I use this params:

join params {
  janus: 'message',
  plugin: 'janus.plugin.videoroom',
  session_id: 8568607942621781,
  handle_id: 3267543887867048,
  transaction: 'VeENHRbBTHWI',
  body: { request: 'join', room: 11, ptype: 'publisher', display: 'test' }
}

But it’s return the ack only:

{
    "janus": "ack",
    "session_id": 8568607942621781,
    "transaction": "VeENHRbBTHWI"
}

I dont know why it not return “joined” event, can you help? I am using https call, not socket

2

after call “join”, I check the participant inside this room, but it return empty list:

{
    "janus": "success",
    "session_id": 4397550774641519,
    "transaction": "h8LgvUJxVXGk",
    "sender": 8580331991428173,
    "plugindata": {
        "plugin": "janus.plugin.videoroom",
        "data": {
            "videoroom": "participants",
            "room": 11,
            "participants": []
        }
    }
}
3

That’s normal. That list only contains active users, those that published a PeerConnection. You may want to read the documentation first.

4

Hi, I am follow the document, I have the question below:

  1. I use htpp cal to join a room , this is the question above that I asked
  2. With the same params, I use socket to call join room, that return joined event after the ack. Then I got “joined” event after that. Then I check the listParticipants like this:
{
   "janus": "success",
   "session_id": 4915235918595631,
   "transaction": "of8Ht4ZseGD5",
   "sender": 4680094336352450,
   "plugindata": {
       "plugin": "janus.plugin.videoroom",
       "data": {
           "videoroom": "participants",
           "room": 1,
           "participants": [
               {
                   "id": 2442054571610922,
                   "display": "ios webrtc",
                   "publisher": false
               }
           ]
       }
   }
}

So I want to ask, if method 1 and 2 does success joined the room, why I get empty listParticipants when using method 1? Thanks