Peer Connection Object is nil

[Rahulgupta-cdnsol]

I am using below code

RTCDataChannelInit *datainit = [[RTCDataChannelInit alloc] init];

datainit.isNegotiated = YES;

datainit.isOrdered = YES;

datainit.maxRetransmits = 30;

datainit.maxRetransmitTimeMs = 30000;

datainit.streamId = 1; self.dataChannel = [_peerConnection createDataChannelWithLabel:@"commands" config:datainit]; self.dataChannel.delegate=self;

but _peerConnection is nil so please let me know how to create this object. Thanks,