fix

apps/iot/src/iot.app.src

@@ -13,7 +13,7 @@
     parse_trans,
     hackney,
     poolboy,
-
+    emqtt,
     mnesia,
     crypto,
     public_key,

apps/iot/src/iot_host.erl

@@ -35,7 +35,7 @@ get_name(HostId) when is_binary(HostId) ->
 -spec(start_link(Name :: atom(), Host :: #host{}) ->
     {ok, Pid :: pid()} | ignore | {error, Reason :: term()}).
 start_link(Name, Host = #host{}) ->
-    gen_server:start_link({local, Name}, ?MODULE, [Host], []).
+    gen_server:start_link({global, Name}, ?MODULE, [Host], []).
 
 %%%===================================================================
 %%% gen_server callbacks

apps/iot/src/iot_http_client.erl

@@ -21,7 +21,7 @@ post(Url, Body) when is_list(Url), is_binary(Body) ->
                     ok;
                 {error, Reason} ->
                     lager:warning("[iot_http_client] url: ~p, get error: ~p", [Url, Reason]),
-                    {error, failed}
+                    {error, Reason}
             end;
 
         {ok, HttpCode, _, ClientRef} ->
@@ -31,10 +31,10 @@ post(Url, Body) when is_list(Url), is_binary(Body) ->
                     ok;
                 {error, Reason} ->
                     lager:warning("[iot_http_client] url: ~p, http_code: ~p, get error: ~p", [Url, HttpCode, Reason]),
-                    {error, failed}
+                    {error, Reason}
             end;
 
         {error, Reason} ->
             lager:warning("[iot_http_client] url: ~p, get error: ~p", [Url, Reason]),
-            {error, failed}
+            {error, Reason}
     end.