From 75ed1401d88df23d67431276d8576fa6a990dbb7 Mon Sep 17 00:00:00 2001
From: Marten Seemann <martenseemann@gmail.com>
Date: Tue, 26 Jan 2021 10:48:29 +0800
Subject: [PATCH] improve error message when the read buffer size can't be set

---
 packet_handler_map.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packet_handler_map.go b/packet_handler_map.go
index b723b54ef..9ecfa0091 100644
--- a/packet_handler_map.go
+++ b/packet_handler_map.go
@@ -58,7 +58,7 @@ var _ packetHandlerManager = &packetHandlerMap{}
 func setReceiveBuffer(c net.PacketConn, logger utils.Logger) error {
 	conn, ok := c.(interface{ SetReadBuffer(int) error })
 	if !ok {
-		return errors.New("connection doesn't allow setting of receive buffer size")
+		return errors.New("connection doesn't allow setting of receive buffer size. Not a *net.UDPConn?")
 	}
 	size, err := inspectReadBuffer(c)
 	if err != nil {