How make webrtc fake media streaming work for one way communication?

I need to make one way webrtc communication. So a fake media stream from one way can be useful. So far I was not able to put a fake stream in RTCPeerConnection. Sending stream from both way works. I tried multiple ways. Can anyone tell me a good way to achieve this?

1. Tried to get media devices with configuration all set to false. But at least one is required.

    navigator.mediaDevices
        .getUserMedia({
          audio: false,
        })
        .then(getUserMediaSuccess)
        .catch(errorHandler);

2. Tried to create fake media capture with canvas from here, but could not succeed.

3. Tried to add new RTCPeerConnection().addTransceiver().receiver.track. But not sure what it is and how to use it properly.

     function start(isCaller) {
     
      //createMediaStreamFake();
      peerConnection.current = new RTCPeerConnection(peerConnectionConfig);
      peerConnection.current.onicecandidate = gotIceCandidate;
      peerConnection.current.ontrack = gotRemoteStream;
      //peerConnection.current.addStream(localStream.current);
      peerConnection.current.addStream(
       new RTCPeerConnection().addTransceiver().receiver.track
      );
     }