From 5a91a7aae8c1a0325f50d693b94a33435537315a Mon Sep 17 00:00:00 2001
From: Juliusz Chroboczek <jch@irif.fr>
Date: Thu, 3 Sep 2020 13:34:39 +0200
Subject: [PATCH] Reset remote connection if SetRemoteDescription fails.

In current versions of pion, SetRemoteDescription fails if ICE is
currently gathering.  Work around the issue by resetting the connection.
---
 webclient.go | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/webclient.go b/webclient.go
index 177fb92..df75622 100644
--- a/webclient.go
+++ b/webclient.go
@@ -463,7 +463,7 @@ func gotOffer(c *webClient, id string, offer webrtc.SessionDescription, renegoti
 		delUpConn(c, id)
 	}
 
-	up, _, err := addUpConn(c, id)
+	up, isnew, err := addUpConn(c, id)
 	if err != nil {
 		return err
 	}
@@ -473,6 +473,11 @@ func gotOffer(c *webClient, id string, offer webrtc.SessionDescription, renegoti
 	}
 	err = up.pc.SetRemoteDescription(offer)
 	if err != nil {
+		if renegotiate && !isnew {
+			// create a new PC from scratch
+			log.Printf("SetRemoteDescription(offer): %v", err)
+			return gotOffer(c, id, offer, false, labels)
+		}
 		return err
 	}