Create VIdeocall room with multiple users using WebRtc and firebase - react-native

Question

i am trying to create a room video call something like Whatsapp with firebase as signalisation server for two users it works perfect as expected but when a third user join everything stop working
if the user A the first who join and the user B the second until the user C join everything work fine but when C join user A freeze and lost user B connection and B share screen with C but also sometimes freezing
here is my code
onst joinRoom = async () => {
const roomRef = await firestore().collection('meets').doc(params.callId);
roomRef
.collection('users')
.add({name, type: 'join'})
.then(() => {
roomRef
.collection('users')
.get()
.then(async querySnapshot => {
if (querySnapshot.empty) {
console.log('EMPTY');
} else {
querySnapshot.forEach(async snap => {
if (snap.data().name !== name && snap.data().type === 'join') {
// data.push(snap.data().name);
await creatOffer(snap.data().name);
}
// if (data.length > 0) {
// Promise.all(data).then(async user => {
// return await creatOffer(user);
// });
// }
});
}
});
});
// // listen on any new offers
roomRef.collection('offers').onSnapshot(data => {
data.docChanges().forEach(async change => {
if (change.type === 'added') {
// console.log('changes', change.doc.data());
if (change.doc.data().to === name) {
await createAnswer(change.doc.data().from, change.doc.data().offer);
}
}
});
});
//listen to answers
roomRef.collection('answers').onSnapshot(async snapshot => {
snapshot.docChanges().forEach(async change => {
if (change.type === 'added') {
const pc = pcPeers[change.doc.data().from];
if (change.doc.data().to === name) {
const rtcSessionDescription = new RTCSessionDescription(
change.doc.data().answer,
);
if (pc && rtcSessionDescription) {
await pc.setRemoteDescription(rtcSessionDescription);
}
}
}
});
});
//listen to candidate change
roomRef.collection('candidates').onSnapshot(async snapshot => {
snapshot.docChanges().forEach(async change => {
// console.log('answers', change.doc.data());
if (change.type === 'added') {
console.log('added', Platform.OS);
if (change.doc.data().to === name) {
const pc = pcPeers[change.doc.data().from];
// console.log(pc);
if (pc) {
await pc.addIceCandidate(
new RTCIceCandidate(change.doc.data().candidate),
);
}
}
}
});
});
};
and function to create offer
const creatOffer = async to => {
try {
const {roomRef, localPC} = await initializePeer(to);
const offer = await localPC.createOffer();
// console.log('offer', offer);
if (offer) {
await localPC.setLocalDescription(offer);
await roomRef.collection('offers').add({from: name, to, offer});
}
pcPeers = {...pcPeers, [to]: localPC};
} catch (e) {
console.log(e);
}
};
function to create answer
const createAnswer = async (from, offer) => {
try {
const {localPC, roomRef} = await initializePeer(from);
await localPC.setRemoteDescription(new RTCSessionDescription(offer));
const answer = await localPC.createAnswer();
await localPC.setLocalDescription(answer);
// await checkIfAnswerAlreadyCreated(from, name);
await roomRef.collection('answers').add({from: name, to: from, answer});
pcPeers = {...pcPeers, [from]: localPC};
} catch (e) {
console.log(e);
}
};
and here is how i initialise a peer
setLocalStream(initialStream);
const roomRef = await firestore().collection('meets').doc(params.callId);
const collection = roomRef.collection('candidates');
localPC.onicecandidate = async e => {
if (!e.candidate) {
return;
}
// console.log('canditates', Platform.OS);
const state = localPC.iceGatheringState;
if (state !== 'complete') {
await collection.add({
from: name,
candidate: e.candidate.toJSON(),
to,
date: new Date(),
});
} else {
Alert.alert('tes');
}
// InCallManager.setForceSpeakerphoneOn(true);
// InCallManager.setSpeakerphoneOn(true);
};
localPC.onsignalingstatechange = async event => {
// when the signal state become stable record the data and stop ringback
if (event.target.signalingState === 'stable') {
if (Platform.OS === 'ios') {
localStream?.getVideoTracks().forEach(track => {
//For ios to trigger the camera on
track._switchCamera();
track._switchCamera();
});
}
}
};
localPC.onaddstream = e => {
if (e?.stream) {
// console.log(
// `RemotePC received the stream call ${Platform.OS}_${Platform.Version}`,
// e?.stream,
// );
console.log(Platform.OS, ' ', Platform.Version);
if (remoteStream === null) {
// Alert.alert('stream 1');
setRemoteStream(e?.stream);
} else {
// Alert.alert('stream 2');
setRemoteStream_(e?.stream);
}
}
};
return {localPC, roomRef};
};
can anyone help me with some hints where is tthe problem i’ve created for my self here and thank you