private async Task InitializeORTC()
{
var gatherOptions = new RTCIceGatherOptions()
{
IceServers = new List <RTCIceServer>()
{
new RTCIceServer
{
Urls = new string[] { _stunUrl }
},
new RTCIceServer
{
Username = _turnUsername,
Credential = _turnCredential,
CredentialType = RTCIceCredentialType.Password,
Urls = new string[] { _turnUrl }
}
}
};
_gatherer = new RTCIceGatherer(gatherOptions);
_gatherer.OnStateChange += IceGatherer_OnStateChange;
_gatherer.OnLocalCandidate += (@event) =>
{
OnSignalMessageToPeer(@event.Candidate.ToJson().ToString());
};
_gatherer.OnLocalCandidateComplete += (@event) =>
{
OnSignalMessageToPeer(@event.Candidate.ToJson().ToString());
};
_ice = new RTCIceTransport(_gatherer);
_ice.OnStateChange += IceTransport_OnStateChange;
_dtls = new RTCDtlsTransport(_ice, new RTCCertificate[]
{
await RTCCertificate.GenerateCertificate()
});
_dtls.OnStateChange += Dtls_OnStateChange;
_sctp = new RTCSctpTransport(_dtls);
_gatherer.Gather(null);
}
/// <summary>
/// Estabilishes a DataChannel with the parameter peer.
/// </summary>
private async Task OpenDataChannel(Peer peer)
{
Debug.WriteLine($"Opening data channel to peer: {peer.Name}");
Conversation = string.Empty;
Debug.WriteLine("Ice: Gathering candidates.");
_gatherer.Gather(null);
var iceParams = _gatherer.GetLocalParameters();
await _signaler.SendToPeer(peer.Id, iceParams.ToJsonString());
// this order guarantees: alice -> bob; bob.start(); bob -> alice; alice.start(); alice -> datachannel -> bob
if (_isInitiator)
{
var sctpCaps = RTCSctpTransport.GetCapabilities();
await _signaler.SendToPeer(peer.Id, sctpCaps.ToJsonString());
}
var dtlsParams = _dtls.GetLocalParameters();
await _signaler.SendToPeer(peer.Id, dtlsParams.ToJsonString());
}