RTCDataChannel: error event

// Strings for each of the SCTP cause codes found in RFC
// 4960, section 3.3.10:
// https://datatracker.ietf.org/doc/html/rfc4960#section-3.3.10

const sctpCauseCodes = [
  "No SCTP error",
  "Invalid stream identifier",
  "Missing mandatory parameter",
  "Stale cookie error",
  "Sender is out of resource (i.e., memory)",
  "Unable to resolve address",
  "Unrecognized SCTP chunk type received",
  "Invalid mandatory parameter",
  "Unrecognized parameters",
  "No user data (SCTP DATA chunk has no data)",
  "Cookie received while shutting down",
  "Restart of an association with new addresses",
  "User-initiated abort",
  "Protocol violation"
];

dc.addEventListener("error", ev => {
  const err = ev.error;

  console.error("WebRTC error: ", err.message);

  // Handle specific error detail types

  switch(err.errorDetail) {
    case "sdp-syntax-error":
      console.error("    SDP syntax error in line ", err.sdpLineNumber);
      break;
    case "idp-load-failure":
      console.error("    Identity provider load failure: HTTP error ",
                    err.httpRequestStatusCode);
      break;
    case "sctp-failure":
      if (err.sctpCauseCode < sctpCauseCodes.length) {
        console.error("    SCTP failure: ", err.sctpCauseCode);
      } else {
        console.error("    Unknown SCTP error");
      }
      break;
    case "dtls-failure":
      if (err.receivedAlert) {
        console.error("    Received DLTS failure alert: ", err.receivedAlert);
      }
      if (err.sentAlert) {
        console.error("    Sent DLTS failure alert: ", err.receivedAlert);
      }
      break;
  }

  // Add source file name and line information

  console.error("    Error in file ", err.filename, " at line ", err.lineNumber,
                ", column ", err.columnNumber);
}, false);

dc.onerror = ev => {
  const err = ev.error;

  /* ... */
}