From 6a4d823b2435652bf18992f488bf8b67262475f0 Mon Sep 17 00:00:00 2001
From: JianBo He <heeejianbo@gmail.com>
Date: Fri, 25 Mar 2022 17:31:31 +0800
Subject: [PATCH] fix(sys): compatible with binary type protocol

---
 apps/emqx/src/emqx_sys.erl | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/apps/emqx/src/emqx_sys.erl b/apps/emqx/src/emqx_sys.erl
index 9fa116313..d3bf72fc3 100644
--- a/apps/emqx/src/emqx_sys.erl
+++ b/apps/emqx/src/emqx_sys.erl
@@ -365,10 +365,13 @@ event_topic(Event, #{clientid := ClientId, protocol := GwName}) ->
         [
             systop("gateway"),
             "/",
-            atom_to_binary(GwName),
+            bin(GwName),
             "/clients/",
             ClientId,
             "/",
-            atom_to_binary(Event)
+            bin(Event)
         ]
     ).
+
+bin(A) when is_atom(A) -> atom_to_binary(A);
+bin(B) when is_binary(B) -> B.