The dtlsRole property of the RTCTransportStats dictionary is a string that indicates the role of the associated RTCPeerConnection in the DTLS negotiation.
Specifically, whether it acted like a server and listened for connections, or like a client and initiated the connection, or that negotiation has not yet started.
A string indicating the DTLS role. This will be one of:
clientThe peer initiated the DTLS handshake.
serverThe peer waited for the DTLS handshake.
unknownDTLS negotiation has not started.