From 0f4ad8e9f1affb2e9016244ebd77611304fa53ca Mon Sep 17 00:00:00 2001
From: anlicheng <244108715@qq.com>
Date: Mon, 17 Nov 2025 16:54:54 +0800
Subject: [PATCH] add mqtt subscriber

---
 apps/iot/src/mocker/endpoint_kafka_test.erl   |   4 +-
 .../src/mocker/endpoint_mqtt_subscriber.erl   | 163 ++++++++++++++++++
 2 files changed, 164 insertions(+), 3 deletions(-)
 create mode 100644 apps/iot/src/mocker/endpoint_mqtt_subscriber.erl

diff --git a/apps/iot/src/mocker/endpoint_kafka_test.erl b/apps/iot/src/mocker/endpoint_kafka_test.erl
index b9d566b..7196ed8 100644
--- a/apps/iot/src/mocker/endpoint_kafka_test.erl
+++ b/apps/iot/src/mocker/endpoint_kafka_test.erl
@@ -40,7 +40,6 @@ start_test() ->
 test_consumer() ->
     KafkaBootstrapEndpoints = [{"118.178.229.213", 9092}],
     Topic = <<"dhlr_data">>,
-    Partition = 0,
 
     ClientConfig = [
         {sasl, {plain, <<"test">>, <<"test123">>}},
@@ -49,11 +48,10 @@ test_consumer() ->
     ],
 
     ok = brod:start_client(KafkaBootstrapEndpoints, client1, ClientConfig),
-    SubscriberCallbackFun = fun(Partition, Msg, ShellPid = CallbackState) ->
+    SubscriberCallbackFun = fun(_Partition, Msg, ShellPid = CallbackState) ->
         lager:debug("call here msg: ~p", [Msg]),
         ShellPid ! Msg, {ok, ack, CallbackState}
                             end,
-    Receive = fun() -> receive Msg -> Msg after 1000 -> timeout end end,
     Res = brod_topic_subscriber:start_link(client1, Topic, all,
         _ConsumerConfig=[{begin_offset, 0}],
         _CommittedOffsets=[], message, SubscriberCallbackFun,
diff --git a/apps/iot/src/mocker/endpoint_mqtt_subscriber.erl b/apps/iot/src/mocker/endpoint_mqtt_subscriber.erl
new file mode 100644
index 0000000..2bce1ab
--- /dev/null
+++ b/apps/iot/src/mocker/endpoint_mqtt_subscriber.erl
@@ -0,0 +1,163 @@
+%%%-------------------------------------------------------------------
+%%% @author anlicheng
+%%% @copyright (C) 2025, <COMPANY>
+%%% @doc
+%%%
+%%% @end
+%%% Created : 17. 11月 2025 16:48
+%%%-------------------------------------------------------------------
+-module(endpoint_mqtt_subscriber).
+-author("anlicheng").
+
+-author("aresei").
+-include("iot.hrl").
+
+-behaviour(gen_server).
+
+%% API
+-export([start_link/0]).
+
+%% gen_server callbacks
+-export([init/1, handle_call/3, handle_cast/2, handle_info/2, terminate/2, code_change/3]).
+
+-define(SERVER, ?MODULE).
+
+%% 需要订阅的主题信息
+-define(Topics,[
+    {<<"/dhlr/data">>, 0}
+]).
+
+-record(state, {
+    conn_pid :: pid()
+}).
+
+%%%===================================================================
+%%% API
+%%%===================================================================
+
+%% @doc Spawns the server and registers the local name (unique)
+-spec(start_link() ->
+    {ok, Pid :: pid()} | ignore | {error, Reason :: term()}).
+start_link() ->
+    gen_server:start_link({local, ?MODULE}, ?MODULE, [], []).
+
+%%%===================================================================
+%%% gen_server callbacks
+%%%===================================================================
+
+%% @private
+%% @doc Initializes the server
+-spec(init(Args :: term()) ->
+    {ok, State :: #state{}} | {ok, State :: #state{}, timeout() | hibernate} |
+    {stop, Reason :: term()} | ignore).
+init([]) ->
+    %% 建立到emqx服务器的连接
+    ClientId = <<"mqtt-client-test-host-subscriber">>,
+    Opts = [
+        {clientid, ClientId},
+        {host, "118.178.229.213"},
+        {port, 1883},
+        {owner, self()},
+        {tcp_opts, []},
+        {username, "admin"},
+        {password, "admin"},
+        {keepalive, 86400},
+        {auto_ack, true},
+        {proto_ver, v5},
+        {retry_interval, 5}
+    ],
+
+    lager:debug("[opts] is: ~p", [Opts]),
+    case emqtt:start_link(Opts) of
+        {ok, ConnPid} ->
+            %% 监听和host相关的全部事件
+            lager:debug("[iot_mqtt_subscriber] start conntecting, pid: ~p", [ConnPid]),
+            {ok, _} = emqtt:connect(ConnPid),
+            lager:debug("[iot_mqtt_subscriber] connect success, pid: ~p", [ConnPid]),
+            SubscribeResult = emqtt:subscribe(ConnPid, ?Topics),
+
+            lager:debug("[iot_mqtt_subscriber] subscribe topics: ~p, result is: ~p", [?Topics, SubscribeResult]),
+
+            {ok, #state{conn_pid = ConnPid}};
+        ignore ->
+            lager:debug("[iot_mqtt_subscriber] connect emqx get ignore"),
+            {stop, ignore};
+        {error, Reason} ->
+            lager:debug("[iot_mqtt_subscriber] connect emqx get error: ~p", [Reason]),
+            {stop, Reason}
+    end.
+
+%% @private
+%% @doc Handling call messages
+-spec(handle_call(Request :: term(), From :: {pid(), Tag :: term()},
+    State :: #state{}) ->
+    {reply, Reply :: term(), NewState :: #state{}} |
+    {reply, Reply :: term(), NewState :: #state{}, timeout() | hibernate} |
+    {noreply, NewState :: #state{}} |
+    {noreply, NewState :: #state{}, timeout() | hibernate} |
+    {stop, Reason :: term(), Reply :: term(), NewState :: #state{}} |
+    {stop, Reason :: term(), NewState :: #state{}}).
+handle_call(_Info, _From, State = #state{conn_pid = _ConnPid}) ->
+    {reply, ok, State}.
+
+%% @private
+%% @doc Handling cast messages
+-spec(handle_cast(Request :: term(), State :: #state{}) ->
+    {noreply, NewState :: #state{}} |
+    {noreply, NewState :: #state{}, timeout() | hibernate} |
+    {stop, Reason :: term(), NewState :: #state{}}).
+handle_cast(_Request, State = #state{}) ->
+    {noreply, State}.
+
+%% @private
+%% @doc Handling all non call/cast messages
+-spec(handle_info(Info :: timeout() | term(), State :: #state{}) ->
+    {noreply, NewState :: #state{}} |
+    {noreply, NewState :: #state{}, timeout() | hibernate} |
+    {stop, Reason :: term(), NewState :: #state{}}).
+handle_info({disconnect, ReasonCode, Properties}, State = #state{}) ->
+    lager:debug("[iot_mqtt_subscriber] Recv a DISONNECT packet - ReasonCode: ~p, Properties: ~p", [ReasonCode, Properties]),
+    {stop, disconnected, State};
+%% 必须要做到消息的快速分发，数据的json反序列需要在host进程进行
+handle_info({publish, #{packet_id := _PacketId, payload := Payload, qos := Qos, topic := Topic}}, State = #state{conn_pid = _ConnPid}) ->
+    lager:debug("[iot_mqtt_subscriber] Recv a topic: ~p, publish packet: ~p, qos: ~p", [Topic, Payload, Qos]),
+    %% 将消息分发到对应的host进程去处理
+    {noreply, State};
+handle_info({puback, Packet = #{packet_id := _PacketId}}, State = #state{}) ->
+    lager:debug("[iot_mqtt_subscriber] receive puback packet: ~p", [Packet]),
+    {noreply, State};
+
+handle_info(Info, State = #state{}) ->
+    lager:debug("[iot_mqtt_subscriber] get info: ~p", [Info]),
+    {noreply, State}.
+
+%% @private
+%% @doc This function is called by a gen_server when it is about to
+%% terminate. It should be the opposite of Module:init/1 and do any
+%% necessary cleaning up. When it returns, the gen_server terminates
+%% with Reason. The return value is ignored.
+-spec(terminate(Reason :: (normal | shutdown | {shutdown, term()} | term()),
+    State :: #state{}) -> term()).
+terminate(Reason, _State = #state{conn_pid = ConnPid}) when is_pid(ConnPid) ->
+    %% 取消topic的订阅
+    TopicNames = lists:map(fun({Name, _}) -> Name end, ?Topics),
+    {ok, _Props, _ReasonCode} = emqtt:unsubscribe(ConnPid, #{}, TopicNames),
+
+    ok = emqtt:disconnect(ConnPid),
+    lager:debug("[iot_mqtt_subscriber] terminate with reason: ~p", [Reason]),
+    ok;
+terminate(Reason, _State) ->
+    lager:debug("[iot_mqtt_subscriber] terminate with reason: ~p", [Reason]),
+    ok.
+
+%% @private
+%% @doc Convert process state when code is changed
+-spec(code_change(OldVsn :: term() | {down, term()}, State :: #state{},
+    Extra :: term()) ->
+    {ok, NewState :: #state{}} | {error, Reason :: term()}).
+code_change(_OldVsn, State = #state{}, _Extra) ->
+    {ok, State}.
+
+%%%===================================================================
+%%% Internal functions
+%%%===================================================================
\ No newline at end of file