From 2bc19c3a622db0470f93c57eb7fbc69ea65085dd Mon Sep 17 00:00:00 2001
From: "Zaiming (Stone) Shi" <zmstone@gmail.com>
Date: Fri, 13 Jan 2023 08:21:09 +0100
Subject: [PATCH] fix(emqx_packet): log empty string if password value is
 missing

to keep it a consistent behaviour comparing when logging username
---
 apps/emqx/src/emqx_packet.erl | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/apps/emqx/src/emqx_packet.erl b/apps/emqx/src/emqx_packet.erl
index d82810d15..c247419f0 100644
--- a/apps/emqx/src/emqx_packet.erl
+++ b/apps/emqx/src/emqx_packet.erl
@@ -601,7 +601,8 @@ format_variable(#mqtt_packet_auth{reason_code = ReasonCode}, _) ->
 format_variable(PacketId, _) when is_integer(PacketId) ->
     io_lib:format("PacketId=~p", [PacketId]).
 
-format_password(undefined) -> "undefined";
+format_password(undefined) -> "";
+format_password(<<>>) -> "";
 format_password(_Password) -> "******".
 
 format_payload(Payload, text) -> ["Payload=", io_lib:format("~ts", [Payload])];