Add fallback method to log selected ICE candidate pairs when getSelectedCandidatePair() is not supported

Author: Yuqi Huang

examples/app.js

@@ -469,6 +469,29 @@ async function printPeerConnectionStateInfo(event, logPrefix, remoteClientId) {
                         console.debug(`Chosen candidate pair (${trackType || 'unknown'}):`, iceTransport.getSelectedCandidatePair());
                     iceTransport.onselectedcandidatepairchange = logSelectedCandidate;
                     logSelectedCandidate();
+                } else {
+                    // Find nominated candidate pair
+                    const nominatedPair = Array.from(stats.values()).find(report => 
+                    report.type === 'candidate-pair' && 
+                    report.nominated === true
+                    );
+            
+                    if (nominatedPair) {
+                        // Get local and remote candidate detailsl;                     
+                        const localCandidate = stats.get(nominatedPair.localCandidateId);
+                        const remoteCandidate = stats.get(nominatedPair.remoteCandidateId);
+                        
+                        if (localCandidate && remoteCandidate) {
+                            // Format candidate strings
+                            const localCandidateStr = `candidate:${localCandidate.foundation || '1'} 1 ${localCandidate.protocol} ${localCandidate.priority} ${localCandidate.address} ${localCandidate.port} typ ${localCandidate.candidateType}`;
+                            const remoteCandidateStr = `candidate:${remoteCandidate.foundation || '1'} 1 ${remoteCandidate.protocol} ${remoteCandidate.priority} ${remoteCandidate.address} ${remoteCandidate.port} typ ${remoteCandidate.candidateType}`;
+                            
+                            console.debug(`Chosen candidate pair (${trackType || 'unknown'}):`, {
+                                localCandidate: localCandidateStr,
+                                remote: remoteCandidateStr
+                            });
+                        }
+                    }
                 }
             } else {
                 console.error('Failed to fetch the candidate pair!');