diff --git a/apps/iot/src/iot_app.erl b/apps/iot/src/iot_app.erl
index f3eae03..1a7afab 100644
--- a/apps/iot/src/iot_app.erl
+++ b/apps/iot/src/iot_app.erl
@@ -15,12 +15,13 @@ start(_StartType, _StartArgs) ->
     %% 启动数据库
     mnesia:start(),
     Tables = mnesia:system_info(tables),
+    %% 加载必须等待的数据库表
     lists:member(router, Tables) andalso mnesia:wait_for_tables([router], infinity),
     lists:member(host, Tables) andalso mnesia:wait_for_tables([host], infinity),
 
     %% 加速内存的回收
     erlang:system_flag(fullsweep_after, 16),
-
+    %% 启动http服务
     start_http_server(),
 
     iot_sup:start_link().
diff --git a/apps/iot/src/iot_host.erl b/apps/iot/src/iot_host.erl
index 4c62d20..bf77e64 100644
--- a/apps/iot/src/iot_host.erl
+++ b/apps/iot/src/iot_host.erl
@@ -13,7 +13,7 @@
 -behaviour(gen_server).
 
 %% API
--export([start_link/2, get_name/1]).
+-export([start_link/2, get_name/1, get_pid/1, publish/4]).
 
 %% gen_server callbacks
 -export([init/1, handle_call/3, handle_cast/2, handle_info/2, terminate/2, code_change/3]).
@@ -29,10 +29,16 @@
 %%%===================================================================
 %%% API
 %%%===================================================================
+get_pid(HostId) when is_binary(HostId) ->
+    Name = get_name(HostId),
+    global:whereis_name(Name).
 
 get_name(HostId) when is_binary(HostId) ->
     binary_to_atom(<<"iot_host:", HostId/binary>>).
 
+publish(Pid, Topic, Message, Qos) when is_pid(Pid), is_binary(Topic) ->
+    gen_server:call(Pid, {publish, Topic, Message, Qos}).
+
 %% @doc Spawns the server and registers the local name (unique)
 -spec(start_link(Name :: atom(), Host :: #host{}) ->
     {ok, Pid :: pid()} | ignore | {error, Reason :: term()}).
@@ -48,7 +54,7 @@ start_link(Name, Host = #host{}) ->
 -spec(init(Args :: term()) ->
     {ok, State :: #state{}} | {ok, State :: #state{}, timeout() | hibernate} |
     {stop, Reason :: term()} | ignore).
-init([Host]) ->
+init([Host = #host{host_id = HostId}]) ->
     lager:debug("[iot_host] host is: ~p", [Host]),
     %% 建立到emqx服务器的连接
     {ok, Props} = application:get_env(iot, emqx_server),
@@ -71,12 +77,14 @@ init([Host]) ->
 
     case emqtt:start_link(Opts) of
         {ok, ConnPid} ->
-            lager:debug("[iot_host] connect success"),
+            lager:debug("[iot_host] connect success, pid: ~p", [ConnPid]),
             %% 监听和host相关的全部事件
-            {ok, _Props} = emqtt:connect(ConnPid),
-            {ok, _Props, _ReasonCodes} = emqtt:subscribe(ConnPid, {<<"/host/123">>, qos1}),
-            %% ok = emqtt:publish(ConnPid, <<"hello">>, #{}, <<"Hello World!">>, [{qos, 0}]).
-            %% {ok, _PktId} = emqtt:publish(ConnPid, <<"hello">>, #{}, <<"Hello World!">>, [{qos, 1}]).
+            {ok, _} = emqtt:connect(ConnPid),
+            Topics = [
+                {<<"/host/", HostId/binary>>, qos1}
+            ],
+            SubscribeResult = emqtt:subscribe(ConnPid, Topics),
+            lager:debug("subscribe result is: ~p", [SubscribeResult]),
 
             {ok, #state{host = Host, is_connected = true, emqx_pid = ConnPid}};
         ignore ->
@@ -97,8 +105,9 @@ init([Host]) ->
     {noreply, NewState :: #state{}, timeout() | hibernate} |
     {stop, Reason :: term(), Reply :: term(), NewState :: #state{}} |
     {stop, Reason :: term(), NewState :: #state{}}).
-handle_call(_Request, _From, State = #state{}) ->
-    {reply, ok, State}.
+handle_call({publish, Topic, Message, Qos}, _From, State = #state{emqx_pid = ConnPid}) ->
+    Result = emqtt:publish(ConnPid, Topic, #{}, Message, [{qos, Qos}]),
+    {reply, Result, State}.
 
 %% @private
 %% @doc Handling cast messages
@@ -115,7 +124,8 @@ handle_cast(_Request, State = #state{}) ->
     {noreply, NewState :: #state{}} |
     {noreply, NewState :: #state{}, timeout() | hibernate} |
     {stop, Reason :: term(), NewState :: #state{}}).
-handle_info(_Info, State = #state{}) ->
+handle_info(Info, State = #state{host = #host{host_id = HostId}}) ->
+    lager:debug("host_id: ~p, get info: ~p", [HostId, Info]),
     {noreply, State}.
 
 %% @private