v=0
o=- 6542080654249767232 2 IN IP4 127.0.0.1
s=-
t=0 0
a=group:BUNDLE 0
a=extmap-allow-mixed
a=msid-semantic: WMS
m=application 9 UDP/DTLS/SCTP webrtc-datachannel
c=IN IP4 0.0.0.0
a=candidate:2781379592 1 udp 2113937151 5da2f2ca-2797-46f3-bed7-a825abb3a884.local 65093 typ host generation 0 network-cost 999
a=ice-ufrag:mpr1
a=ice-pwd:IpYJsifvS1E5/gDGbyCWWfWp
a=ice-options:trickle
a=fingerprint:sha-256 48:9B:5F:6A:F7:AB:57:48:49:05:41:44:0D:3C:A7:55:C6:A2:BE:3F:06:AE:03:26:0F:84:57:FC:01:7C:3A:3C
a=setup:actpass
a=mid:0
a=sctp-port:5000
a=max-message-size:262144

// creates a local RTC connection
const localConnection = new RTCPeerConnection();

// fires when we get a new ICE canidate, this the moment when we need to share the SDP
localConnection.onicecandidate = (e) => {
  console.log(' NEW ice candidate !! on localconnection reprinting SDP ');
  console.log(JSON.stringify(localConnection.localDescription));
};

// creating a simple data channel to chat peer to peer

const sendChannel = localConnection.createDataChannel('sendChannel');
sendChannel.onmessage = (e) => console.log('messsage received!!!' + e.data);
sendChannel.onopen = (e) => console.log('open!!!!');
sendChannel.onclose = (e) => console.log('closed!!!!!!');

// creating an SDP offer, then set is as our local SDP
localConnection.createOffer().then((o) => localConnection.setLocalDescription(o));

//you can specify a STUN server here
const iceConfiguration = {};

iceConfiguration.iceServers = [];

//turn server
iceConfiguration.iceServers.push({
  urls: 'turn:my-turn-server.mycompany.com:19403',
  username: 'optional-username',
  credentials: 'auth-token',
});

//stun  server
iceConfiguration.iceServers.push({
  urls: 'stun:stun1.l.google.com:19302',
});

const localConnection = new RTCPeerConnection(iceConfiguration);

// set offer with the SDP value from other peer using signaling via any meduim you want 
 const offer = '...'
const remoteConnection = new RTCPeerConnection();

remoteConnection.onicecandidate = (e) => {
  console.log(' NEW ice candidnat!! on localconnection reprinting SDP ');
  console.log(JSON.stringify(remoteConnection.localDescription));
};

remoteConnection.ondatachannel = (e) => {
  const receiveChannel = e.channel;
  receiveChannel.onmessage = (e) => console.log('messsage received!!!' + e.data);
  receiveChannel.onopen = (e) => console.log('open!!!!');
  receiveChannel.onclose = (e) => console.log('closed!!!!!!');
  remoteConnection.channel = receiveChannel;
};

// here we set the other party SDP as our remote SDP and we do the same on the other party
remoteConnection.setRemoteDescription(offer).then((a) => console.log('done'));

//create answer which also trigger new SDP, we also must set the local SDP with that answer
await remoteConnection
  .createAnswer()
  .then((a) => remoteConnection.setLocalDescription(a))
  .then((a) => console.log(JSON.stringify(remoteConnection.localDescription)));
  
//send the answer to the client

// set offer with the SDP value from other peer using signaling via any meduim you want 
 const offer = '...'
const remoteConnection = new RTCPeerConnection();

remoteConnection.onicecandidate = (e) => {
  console.log(' NEW ice candidnat!! on localconnection reprinting SDP ');
  console.log(JSON.stringify(remoteConnection.localDescription));
};

remoteConnection.ondatachannel = (e) => {
  const receiveChannel = e.channel;
  receiveChannel.onmessage = (e) => console.log('messsage received!!!' + e.data);
  receiveChannel.onopen = (e) => console.log('open!!!!');
  receiveChannel.onclose = (e) => console.log('closed!!!!!!');
  remoteConnection.channel = receiveChannel;
};

// here we set the other party SDP as our remote SDP and we do the same on the other party
remoteConnection.setRemoteDescription(offer).then((a) => console.log('done'));

//create answer which also trigger new SDP, we also must set the local SDP with that answer
await remoteConnection
  .createAnswer()
  .then((a) => remoteConnection.setLocalDescription(a))
  .then((a) => console.log(JSON.stringify(remoteConnection.localDescription)));
  
//send the answer to the client