CODEWITHSUNDEEP
react-nativewebrtc
Mochi08
Mochi08

Reputation: 197

React Native WebRTC setRemoteDescription error

First time trying out webRTC and I am kind of stuck for the moment. This is in React Native with react-native-webrtc. I am testing to see if I can establish p2p connection between 2 android phones manually step by step. So I try to initiate call from one phone by creating an offer and sending it thru email to my 2nd phone. Then in my 2nd phone I would copy and paste the offer into a text field in my test app and press a button to parse the offer and setRemoteDescription. This is the step I am getting error.

Here's my codes for generating and sending an offer.

const configuration = {iceServers: [{url: 'stun:stun.l.google.com:19302'}]};
const pc = new RTCPeerConnection(configuration);
pc.addStream(newStream);
pc.createOffer().then((desc) => {
  pc.setLocalDescription(desc).then(() => {
    this.setState({offer: JSON.stringify(desc)});
    this.sendSDP(JSON.stringify(desc));
  });
});

Here's the code for parsing the offer string and setRemoteDescription:

const peer = new RTCPeerConnection(configuration);
const remoteOffer = JSON.parse(this.state.remoteOffer.trim());
peer.setRemoteDescription(new RTCSessionDescription(remoteOffer))
  .then(() => {
    console.log('Success');
  });

Here's the error: Possible Unhandled Promise Rejection (id: 0): "SessionDescription is NULL."

And this is a smaple SDP it generated:

v=0
o=- 5299598814408802478 2 IN IP4 127.0.0.1
s=-
t=0 0
a=group:BUNDLE audio video
a=msid-semantic: WMS 60bf7681-7bb3-4e23-9c53-d893ee22e887
m=audio 9 UDP/TLS/RTP/SAVPF 111 103 104 9 102 0 8 106 105 13 110 112 113 126
c=IN IP4 0.0.0.0
a=rtcp:9 IN IP4 0.0.0.0
a=ice-ufrag:9UIW
a=ice-pwd:fnnBPehMg0DeaEJUJerme780
a=ice-options:trickle renomination
a=fingerprint:sha-256 
27:C9:67:A0:F9:12:1B:6E:E7:50:D5:AD:C0:02:59:62:0A:68:43:28:03:44:7D:EC:D6:F1:7E:1A:E2:AF:72:77
a=setup:actpass
a=mid:audio
a=extmap:1 urn:ietf:params:rtp-hdrext:ssrc-audio-level
a=extmap:2 http://www.webrtc.org/experiments/rtp-hdrext/abs-send-time
a=extmap:3 http://www.ietf.org/id/draft-holmer-rmcat-transport-wide-cc-extensions-01
a=sendrecv
a=rtcp-mux
a=rtpmap:111 opus/48000/2
a=rtcp-fb:111 transport-cc
a=fmtp:111 minptime=10;useinbandfec=1
a=rtpmap:103 ISAC/16000
a=rtpmap:104 ISAC/32000
a=rtpmap:9 G722/8000
a=rtpmap:102 ILBC/8000
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:106 CN/32000
a=rtpmap:105 CN/16000
a=rtpmap:13 CN/8000
a=rtpmap:110 telephone-event/48000
a=rtpmap:112 telephone-event/32000
a=rtpmap:113 telephone-event/16000
a=rtpmap:126 telephone-event/8000
a=ssrc:670797681 cname:I8LsJZX3n5eJai4a
a=ssrc:670797681 msid:60bf7681-7bb3-4e23-9c53-d893ee22e887 6d561642-6ff6-417a-bbf4-597fc1adeefc
a=ssrc:670797681 mslabel:60bf7681-7bb3-4e23-9c53-d893ee22e887
a=ssrc:670797681 label:6d561642-6ff6-417a-bbf4-597fc1adeefc
m=video 9 UDP/TLS/RTP/SAVPF 96 97 98 99 100 101 127 123 125
c=IN IP4 0.0.0.0
a=rtcp:9 IN IP4 0.0.0.0
a=ice-ufrag:9UIW
a=ice-pwd:fnnBPehMg0DeaEJUJerme780
a=ice-options:trickle renomination
a=fingerprint:sha-256 
27:C9:67:A0:F9:12:1B:6E:E7:50:D5:AD:C0:02:59:62:0A:68:43:28:03:44:7D:EC:D6:F1:7E:1A:E2:AF:72:77
a=setup:actpass
a=mid:video
a=extmap:14 urn:ietf:params:rtp-hdrext:toffset
a=extmap:2 http://www.webrtc.org/experiments/rtp-hdrext/abs-send-time
a=extmap:13 urn:3gpp:video-orientation
a=extmap:3 http://www.ietf.org/id/draft-holmer-rmcat-transport-wide-cc-extensions-01
a=extmap:5 http://www.webrtc.org/experiments/rtp-hdrext/playout-delay
a=extmap:6 http://www.webrtc.org/experiments/rtp-hdrext/video-content-type
a=extmap:7 http://www.webrtc.org/experiments/rtp-hdrext/video-timing
a=extmap:8 http://tools.ietf.org/html/draft-ietf-avtext-framemarking-07
a=extmap:9 http://www.webrtc.org/experiments/rtp-hdrext/color-space
a=sendrecv
a=rtcp-mux
a=rtcp-rsize
a=rtpmap:96 VP8/90000
a=rtcp-fb:96 goog-remb
a=rtcp-fb:96 transport-cc
a=rtcp-fb:96 ccm fir
a=rtcp-fb:96 nack
a=rtcp-fb:96 nack pli
a=rtpmap:97 rtx/90000
a=fmtp:97 apt=96
a=rtpmap:98 VP9/90000
a=rtcp-fb:98 goog-remb
a=rtcp-fb:98 transport-cc
a=rtcp-fb:98 ccm fir
a=rtcp-fb:98 nack
a=rtcp-fb:98 nack pli
a=rtpmap:99 rtx/90000
a=fmtp:99 apt=98
a=rtpmap:100 H264/90000
a=rtcp-fb:100 goog-remb
a=rtcp-fb:100 transport-cc
a=rtcp-fb:100 ccm fir
a=rtcp-fb:100 nack
a=rtcp-fb:100 nack pli
a=fmtp:100 level-asymmetry-allowed=1;packetization-mode=1;profile-level-id=42e01f
a=rtpmap:101 rtx/90000
a=fmtp:101 apt=100
a=rtpmap:127 red/90000
a=rtpmap:123 rtx/90000
a=fmtp:123 apt=127
a=rtpmap:125 ulpfec/90000
a=ssrc-group:FID 3993542722 2266256606
a=ssrc:3993542722 cname:I8LsJZX3n5eJai4a
a=ssrc:3993542722 msid:60bf7681-7bb3-4e23-9c53-d893ee22e887 7f960b56-02ec-453d-b69b-07311714c8be
a=ssrc:3993542722 mslabel:60bf7681-7bb3-4e23-9c53-d893ee22e887
a=ssrc:3993542722 label:7f960b56-02ec-453d-b69b-07311714c8be
a=ssrc:2266256606 cname:I8LsJZX3n5eJai4a
a=ssrc:2266256606 msid:60bf7681-7bb3-4e23-9c53-d893ee22e887 7f960b56-02ec-453d-b69b-07311714c8be
a=ssrc:2266256606 mslabel:60bf7681-7bb3-4e23-9c53-d893ee22e887
a=ssrc:2266256606 label:7f960b56-02ec-453d-b69b-07311714c8be

What am I missing or doing incorrectly here?

Upvotes: 1

Views: 958

Answers (1)

Mochi08
Mochi08

Reputation: 197

I finally figured out the issue and it is anti-dramatic. The problem is that when I send the offer through email, the email automatically adds a line break somewhere in the middle which caused the error. For now I used the text-fixer website tool to remove the line break until I move on to use a proper signaling method.

Upvotes: 1

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