diff --git a/apps/emqx_gateway/etc/emqx_gateway.conf b/apps/emqx_gateway/etc/emqx_gateway.conf
index 6c7928174..8c77fe652 100644
--- a/apps/emqx_gateway/etc/emqx_gateway.conf
+++ b/apps/emqx_gateway/etc/emqx_gateway.conf
@@ -38,7 +38,7 @@ gateway: {
     }
 
     coap.1: {
-      enable_stats: false
+        enable_stats: false
 
         authentication: {
             enable: true
@@ -52,16 +52,16 @@ gateway: {
             ]
         }
 
-      #authentication.enable: false
+        #authentication.enable: false
 
-      heartbeat: 30s
-      notify_type: qos
-      subscribe_qos: qos0
-      publish_qos: qos1
-      listener.udp.1: {
-        bind: 5683
+        heartbeat: 30s
+        notify_type: qos
+        subscribe_qos: qos0
+        publish_qos: qos1
+        listener.udp.1: {
+            bind: 5683
         }
-      }
+    }
 
     mqttsn.1: {
         ## The MQTT-SN Gateway ID in ADVERTISE message.
diff --git a/apps/emqx_gateway/src/coap/README.md b/apps/emqx_gateway/src/coap/README.md
index c451d6533..12b5ac5b7 100644
--- a/apps/emqx_gateway/src/coap/README.md
+++ b/apps/emqx_gateway/src/coap/README.md
@@ -108,10 +108,10 @@ The server manages the client through the ClientId. If the ClientId is wrong, EM
 1.  Create a Connection
 
     Method: POST
-    URI Schema: mqtt/{+topic}{?q\*}
+    URI Schema: mqtt/connection{?q\*}
     q\*:
 
-    -   clientId := client uid
+    -   clientid := client uid
     -   username
     -   password
 
@@ -126,10 +126,10 @@ The server manages the client through the ClientId. If the ClientId is wrong, EM
 2.  Close a Connection
 
     Method : DELETE
-    URI Schema: mqtt/{+topic}{?q\*}
+    URI Schema: mqtt/connection{?q\*}
     q\*:
 
-    -   clientId := client uid
+    -   clientid := client uid
     -   token
 
     Resonse:
@@ -143,12 +143,14 @@ The server manages the client through the ClientId. If the ClientId is wrong, EM
 
 ### Heartbeat
 
-The Coap client can maintain the "connection" with the server through the heartbeat (regardless of whether it is authenticated or not), so that the server will not release related resources
+The Coap client can maintain the "connection" with the server through the heartbeat,
+regardless of whether it is authenticated or not,
+so that the server will not release related resources
 Method : PUT
-URI Schema: mqtt/{+topic}{?q\*}
+URI Schema: mqtt/connection{?q\*}
 q\*:
 
--   clientId if authenticated
+-   clientid if authenticated
 -   token if authenticated
 
 Response:
@@ -166,7 +168,7 @@ CoAP gateway uses some options in query string to conversion between MQTT CoAP.
 
 1.  Shared Options <a id="orgc50043b"></a>
 
-    -   clientId
+    -   clientid
     -   token
 
 2.  Connect Options
@@ -188,9 +190,9 @@ CoAP gateway uses some options in query string to conversion between MQTT CoAP.
     </colgroup>
     <thead>
     <tr>
-    <th scope="col" class="org-left">option</th>
-    <th scope="col" class="org-left">value type</th>
-    <th scope="col" class="org-left">default</th>
+    <th scope="col" class="org-left">Option</th>
+    <th scope="col" class="org-left">Type</th>
+    <th scope="col" class="org-left">Default</th>
     </tr>
     </thead>
 
@@ -204,7 +206,7 @@ CoAP gateway uses some options in query string to conversion between MQTT CoAP.
 
     <tr>
     <td class="org-left">qos</td>
-    <td class="org-left">MQTT QOS</td>
+    <td class="org-left">MQTT Qos</td>
     <td class="org-left">See <a href="#org0345c3e">here</a></td>
     </tr>
 
@@ -231,16 +233,16 @@ CoAP gateway uses some options in query string to conversion between MQTT CoAP.
     </colgroup>
     <thead>
     <tr>
-    <th scope="col" class="org-left">option</th>
-    <th scope="col" class="org-left">value type</th>
-    <th scope="col" class="org-right">default</th>
+    <th scope="col" class="org-left">Option</th>
+    <th scope="col" class="org-left">Type</th>
+    <th scope="col" class="org-right">Default</th>
     </tr>
     </thead>
 
     <tbody>
     <tr>
     <td class="org-left">qos</td>
-    <td class="org-left">MQTT QOS</td>
+    <td class="org-left">MQTT Qos</td>
     <td class="org-right">See <a href="#org2325c7d">here</a></td>
     </tr>
 
@@ -260,7 +262,7 @@ CoAP gateway uses some options in query string to conversion between MQTT CoAP.
     </tbody>
     </table>
 
-5.  MQTT QOS <=> CoAP non/con
+5.  MQTT Qos <=> CoAP non/con
 
     1.notif_type
     Control the type of notify messages when the observed object has changed.Can be:
@@ -268,7 +270,7 @@ CoAP gateway uses some options in query string to conversion between MQTT CoAP.
     -   non
     -   con
     -   qos
-        in this value, MQTT QOS0 -> non, QOS1/QOS2 -> con
+        in this value, MQTT Qos0 -> non, Qos1/Qos2 -> con
 
     2.subscribe_qos <a id="org2325c7d"></a>
     Control the qos of subscribe.Can be:
@@ -300,7 +302,7 @@ CoAP gateway uses some options in query string to conversion between MQTT CoAP.
 
 2.  Session
 
-    Manager the "Transport Mnager" "Observe Resouces Manger" and next message id
+    Manager the "Transport Manager" "Observe Resouces Manger" and next message id
 
 3.  Transport Mnager
 
diff --git a/apps/emqx_gateway/src/coap/emqx_coap_channel.erl b/apps/emqx_gateway/src/coap/emqx_coap_channel.erl
index 7612a6142..760a832ae 100644
--- a/apps/emqx_gateway/src/coap/emqx_coap_channel.erl
+++ b/apps/emqx_gateway/src/coap/emqx_coap_channel.erl
@@ -148,7 +148,7 @@ get_config(Key, #exec_ctx{config = Cfg}, Def) ->
     maps:get(Key, Cfg, Def).
 
 result_keys() ->
-    [out, reply, connection].
+    [out, connection].
 
 transfer_result(From, Value, Result) ->
     ?TRANSFER_RESULT(From, Value, Result).
@@ -289,9 +289,9 @@ handle_result(out, #{out := Out}, _, Channel) ->
 handle_result(_, _, _, Channel) ->
     {ok, Channel}.
 
-check_auth_state(Method, #channel{config = Cfg} = Channel) ->
+check_auth_state(Msg, #channel{config = Cfg} = Channel) ->
     #{authentication := #{enable := Enable}} = Cfg,
-    check_token(Enable, Method, Channel).
+    check_token(Enable, Msg, Channel).
 
 check_token(true,
             #coap_message{options = Options} = Msg,
diff --git a/apps/emqx_gateway/src/coap/emqx_coap_session.erl b/apps/emqx_gateway/src/coap/emqx_coap_session.erl
index 98e24f05c..50e91797b 100644
--- a/apps/emqx_gateway/src/coap/emqx_coap_session.erl
+++ b/apps/emqx_gateway/src/coap/emqx_coap_session.erl
@@ -162,7 +162,7 @@ deliver(Delivers, Ctx, Session) ->
           end,
     lists:foldl(Fun,
                 #{out => [], session => Session},
-                Delivers).
+                lists:reverse(Delivers)).
 
 timeout(Timer, Ctx, Session) ->
     call_transport_manager(?FUNCTION_NAME, Timer, Ctx, [fun process_tm/3], Session).
@@ -189,8 +189,8 @@ call_transport_manager(Fun,
                                            Session),
         emqx_coap_channel:transfer_result(session, Session2, Result2)
     catch Type:Reason:Stack ->
-            ?ERROR("process transmission with, message:~p failed~n
-Type:~p,Reason:~p~n,StackTrace:~p~n", [Msg, Type, Reason, Stack]),
+            ?ERROR("process transmission with, message:~p failed~nType:~p,Reason:~p~n,StackTrace:~p~n",
+                   [Msg, Type, Reason, Stack]),
             ?REPLY({error, internal_server_error}, Msg)
     end.