diff --git a/core/cmd/core-mqtt/main.go b/core/cmd/core-mqtt/main.go
new file mode 100644
index 0000000..ffd55d4
--- /dev/null
+++ b/core/cmd/core-mqtt/main.go
@@ -0,0 +1,56 @@
+package main
+
+import (
+	"crypto/tls"
+	"encoding/json"
+	"fmt"
+	"os"
+	"time"
+
+	mqtt "github.com/eclipse/paho.mqtt.golang"
+)
+
+func main() {
+	broker := "wss://broker.emqx.io:8084/mqtt"
+	clientID := "Mqttx_07c4e9ed"
+	username := "1"
+	password := "1"
+	topic := "$dp"
+
+	opts := mqtt.NewClientOptions()
+	opts.AddBroker(broker)
+	opts.SetClientID(clientID)
+	opts.SetUsername(username)
+	opts.SetPassword(password)
+	opts.SetProtocolVersion(4)
+	opts.SetKeepAlive(60 * time.Second)
+	opts.SetAutoReconnect(true)
+	opts.SetCleanSession(true)
+	opts.SetTLSConfig(&tls.Config{InsecureSkipVerify: true})
+
+	c := mqtt.NewClient(opts)
+	if t := c.Connect(); t.Wait() && t.Error() != nil {
+		fmt.Printf("connect error: %v\n", t.Error())
+		os.Exit(1)
+	}
+	defer c.Disconnect(250)
+
+	// 构造所需数据格式（仅设备与时间变更）
+	payload := map[string]any{
+		"type":   "hws",
+		"device": "Z866",
+		"Dm":     0.0001,
+		"Pa":     976.7,
+		"Rc":     0,
+		"Sm":     0.0001,
+		"Ta":     39,
+		"Ua":     26.6,
+		"time":   time.Now().UnixMilli(),
+	}
+	b, _ := json.Marshal(payload)
+	if t := c.Publish(topic, 1, false, b); t.Wait() && t.Error() != nil {
+		fmt.Printf("publish error: %v\n", t.Error())
+		os.Exit(2)
+	}
+	fmt.Println("published to", topic)
+}
diff --git a/core/cmd/service-mqtt-publisher/main.go b/core/cmd/service-mqtt-publisher/main.go
new file mode 100644
index 0000000..499fecd
--- /dev/null
+++ b/core/cmd/service-mqtt-publisher/main.go
@@ -0,0 +1,228 @@
+package main
+
+import (
+	"context"
+	"crypto/tls"
+	"encoding/json"
+	"fmt"
+	"log"
+	"math"
+	"time"
+
+	mqtt "github.com/eclipse/paho.mqtt.golang"
+
+	"weatherstation/core/internal/data"
+)
+
+const (
+	// 固定映射
+	deviceID  = "Z866"
+	stationID = "RS485-002A6E"
+
+	// MQTT 测试配置（可替换为生产）
+	brokerURL = "wss://broker.emqx.io:8084/mqtt"
+	clientID  = "core-publisher-Z866"
+	username  = "1"
+	password  = "1"
+	topic     = "$dp"
+)
+
+type hwsPayload struct {
+	Type   string  `json:"type"`
+	Device string  `json:"device"`
+	Dm     float64 `json:"Dm"`
+	Pa     float64 `json:"Pa"`
+	Rc     float64 `json:"Rc"`
+	Sm     float64 `json:"Sm"`
+	Ta     float64 `json:"Ta"`
+	Ua     float64 `json:"Ua"`
+	Time   int64   `json:"time"`
+}
+
+func main() {
+	// 初始化 MQTT 客户端
+	opts := mqtt.NewClientOptions().AddBroker(brokerURL)
+	opts.SetClientID(clientID)
+	opts.SetUsername(username)
+	opts.SetPassword(password)
+	opts.SetProtocolVersion(4)
+	opts.SetKeepAlive(60 * time.Second)
+	opts.SetAutoReconnect(true)
+	opts.SetCleanSession(true)
+	opts.SetTLSConfig(&tls.Config{InsecureSkipVerify: true})
+
+	cli := mqtt.NewClient(opts)
+	if tok := cli.Connect(); tok.Wait() && tok.Error() != nil {
+		log.Fatalf("MQTT 连接失败: %v", tok.Error())
+	}
+	defer cli.Disconnect(250)
+
+	// 5分钟发布任务
+	go alignAndRun5m(func(tickEnd time.Time) { publishOnce(cli, tickEnd) })
+	// 1小时+10分钟发布预测任务
+	go alignAndRunHour10(func(tick time.Time) { publishPredict(cli, tick) })
+
+	select {}
+}
+
+func alignAndRun5m(fn func(tickEnd time.Time)) {
+	now := time.Now()
+	next := now.Truncate(5 * time.Minute).Add(5 * time.Minute)
+	time.Sleep(time.Until(next))
+	for {
+		tickEnd := time.Now().Truncate(5 * time.Minute)
+		fn(tickEnd)
+		time.Sleep(5 * time.Minute)
+	}
+}
+
+func alignAndRunHour10(fn func(tick time.Time)) {
+	// 计算下一个 “整点+10分钟”
+	now := time.Now()
+	base := time.Date(now.Year(), now.Month(), now.Day(), now.Hour(), 10, 0, 0, now.Location())
+	var next time.Time
+	if now.After(base) {
+		next = base.Add(1 * time.Hour)
+	} else {
+		next = base
+	}
+	time.Sleep(time.Until(next))
+	for {
+		tick := time.Now().Truncate(time.Minute)
+		fn(tick)
+		// 每小时执行一次
+		time.Sleep(1 * time.Hour)
+	}
+}
+
+func publishOnce(cli mqtt.Client, tickEnd time.Time) {
+	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+	defer cancel()
+
+	start := tickEnd.Add(-5 * time.Minute)
+	// 聚合窗口
+	agg, err := data.WindowAverages(ctx, stationID, start, tickEnd)
+	if err != nil {
+		log.Printf("聚合失败: %v", err)
+		return
+	}
+	// 当天累计雨量
+	rc, err := data.DailyRainSinceMidnight(ctx, stationID, tickEnd)
+	if err != nil {
+		log.Printf("降雨查询失败: %v", err)
+		return
+	}
+
+	// 处理无效值：若无数据则用 0（<0.001 算无效）
+	dm := 0.0
+	if agg.Dm.Valid {
+		dm = agg.Dm.Float64
+	}
+	sm := 0.0
+	if agg.Sm.Valid {
+		sm = agg.Sm.Float64
+	}
+	ta := 0.0
+	if agg.Ta.Valid {
+		ta = agg.Ta.Float64
+	}
+	ua := 0.0
+	if agg.Ua.Valid {
+		ua = agg.Ua.Float64
+	}
+	pa := 0.0
+	if agg.Pa.Valid {
+		pa = agg.Pa.Float64
+	}
+
+	// 四舍五入：风向取整数，其它保留两位小数
+	round2 := func(v float64) float64 { return math.Round(v*100) / 100 }
+	dmInt := math.Round(dm)
+
+	payload := hwsPayload{
+		Type:   "hws",
+		Device: deviceID,
+		Dm:     dmInt,
+		Pa:     round2(pa),
+		Rc:     round2(rc),
+		Sm:     round2(sm),
+		Ta:     round2(ta),
+		Ua:     round2(ua),
+		Time:   tickEnd.UnixMilli(),
+	}
+	b, _ := json.Marshal(payload)
+
+	tok := cli.Publish(topic, 1, false, b)
+	tok.Wait()
+	if tok.Error() != nil {
+		log.Printf("发布失败: %v", tok.Error())
+		return
+	}
+	log.Printf("发布成功 %s: %s", topic, string(b))
+}
+
+// 预测发布：每小时+10分钟，从 forecast_hourly 按 issued_at=整点 选取数据
+func publishPredict(cli mqtt.Client, tick time.Time) {
+	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+	defer cancel()
+
+	// 以 CST 解析 issued_at 整点
+	loc, _ := time.LoadLocation("Asia/Shanghai")
+	if loc == nil {
+		loc = time.FixedZone("CST", 8*3600)
+	}
+	now := tick.In(loc)
+	issued := time.Date(now.Year(), now.Month(), now.Day(), now.Hour(), 0, 0, 0, loc)
+
+	const forecastStation = "RS485-002A6E"
+	const provider = "imdroid_mix"
+	points, err := data.ForecastRainAtIssued(ctx, forecastStation, provider, issued)
+	if err != nil {
+		log.Printf("预测查询失败: %v", err)
+		return
+	}
+	if len(points) == 0 {
+		log.Printf("预测无数据 issued_at=%s", issued.Format("2006-01-02 15:04:05"))
+		return
+	}
+
+	// 组装 payload
+	type predictItem struct {
+		PredictTime     int64  `json:"predict_time"`
+		PredictRainfall string `json:"predict_rainfall"`
+	}
+	var items []predictItem
+	for _, p := range points {
+		rf := float64(p.RainMMx1000) / 1000.0
+		items = append(items, predictItem{
+			PredictTime:     p.ForecastTime.UnixMilli(),
+			PredictRainfall: format3(rf),
+		})
+	}
+
+	payload := struct {
+		Type   string        `json:"type"`
+		Device string        `json:"device"`
+		Time   int64         `json:"time"`
+		Data   []predictItem `json:"data"`
+	}{
+		Type:   "predict",
+		Device: deviceID,
+		Time:   now.UnixMilli(), // 当前“整点+10分钟”的时间
+		Data:   items,
+	}
+	b, _ := json.Marshal(payload)
+	tok := cli.Publish(topic, 1, false, b)
+	tok.Wait()
+	if tok.Error() != nil {
+		log.Printf("发布预测失败: %v", tok.Error())
+		return
+	}
+	log.Printf("发布预测成功 %s: issued_at=%s, items=%d", topic, issued.Format("2006-01-02 15:04:05"), len(items))
+}
+
+func format3(v float64) string {
+	// 保留三位小数（字符串形式）
+	s := fmt.Sprintf("%.3f", v)
+	return s
+}
diff --git a/core/internal/data/forecast.go b/core/internal/data/forecast.go
new file mode 100644
index 0000000..752a675
--- /dev/null
+++ b/core/internal/data/forecast.go
@@ -0,0 +1,40 @@
+package data
+
+import (
+	"context"
+	"database/sql"
+	"time"
+	"weatherstation/internal/database"
+)
+
+type PredictPoint struct {
+	ForecastTime time.Time
+	RainMMx1000  int32
+}
+
+// ForecastRainAtIssued returns forecast hourly rows for a given station/provider at an exact issued_at time.
+func ForecastRainAtIssued(ctx context.Context, stationID, provider string, issuedAt time.Time) ([]PredictPoint, error) {
+	const q = `
+        SELECT forecast_time, rain_mm_x1000
+        FROM forecast_hourly
+        WHERE station_id=$1 AND provider=$2 AND issued_at=$3
+        ORDER BY forecast_time ASC`
+	rows, err := database.GetDB().QueryContext(ctx, q, stationID, provider, issuedAt)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	var out []PredictPoint
+	for rows.Next() {
+		var p PredictPoint
+		var rain sql.NullInt32
+		if err := rows.Scan(&p.ForecastTime, &rain); err != nil {
+			continue
+		}
+		if rain.Valid {
+			p.RainMMx1000 = rain.Int32
+		}
+		out = append(out, p)
+	}
+	return out, nil
+}
diff --git a/core/internal/data/raw.go b/core/internal/data/raw.go
new file mode 100644
index 0000000..60e0503
--- /dev/null
+++ b/core/internal/data/raw.go
@@ -0,0 +1,85 @@
+package data
+
+import (
+	"context"
+	"database/sql"
+	"math"
+	"time"
+	"weatherstation/internal/database"
+)
+
+type WindowAgg struct {
+	Ta sql.NullFloat64
+	Ua sql.NullFloat64
+	Pa sql.NullFloat64
+	Sm sql.NullFloat64
+	Dm sql.NullFloat64
+}
+
+// WindowAverages computes averages on rs485_weather_data over [start,end) window.
+// Filters values < 0.001 as invalid. Wind direction averaged vectorially.
+func WindowAverages(ctx context.Context, stationID string, start, end time.Time) (WindowAgg, error) {
+	const q = `
+        SELECT
+          AVG(temperature) AS ta,
+          AVG(humidity)    AS ua,
+          AVG(pressure)    AS pa,
+          AVG(CASE WHEN wind_speed >= 0.001 THEN wind_speed END) AS sm,
+          DEGREES(
+            ATAN2(
+              AVG(CASE WHEN wind_speed >= 0.001 THEN SIN(RADIANS(wind_direction)) END),
+              AVG(CASE WHEN wind_speed >= 0.001 THEN COS(RADIANS(wind_direction)) END)
+            )
+          ) AS dm
+        FROM rs485_weather_data
+        WHERE station_id = $1 AND timestamp >= $2 AND timestamp < $3`
+	var agg WindowAgg
+	err := database.GetDB().QueryRowContext(ctx, q, stationID, start, end).Scan(
+		&agg.Ta, &agg.Ua, &agg.Pa, &agg.Sm, &agg.Dm,
+	)
+	if err != nil {
+		return WindowAgg{}, err
+	}
+	// Normalize Dm to [0,360)
+	if agg.Dm.Valid {
+		v := agg.Dm.Float64
+		if v < 0 {
+			v += 360.0
+		}
+		// handle NaN from no data
+		if math.IsNaN(v) {
+			agg.Dm.Valid = false
+		} else {
+			agg.Dm.Float64 = v
+		}
+	}
+	return agg, nil
+}
+
+// DailyRainSinceMidnight computes current_day_rain = max(0, latest - baselineAtMidnight).
+// If baseline is null, returns 0.
+func DailyRainSinceMidnight(ctx context.Context, stationID string, now time.Time) (float64, error) {
+	// Midnight in Asia/Shanghai
+	loc, _ := time.LoadLocation("Asia/Shanghai")
+	if loc == nil {
+		loc = time.FixedZone("CST", 8*3600)
+	}
+	dayStart := time.Date(now.In(loc).Year(), now.In(loc).Month(), now.In(loc).Day(), 0, 0, 0, 0, loc)
+
+	var baseline sql.NullFloat64
+	const qBase = `SELECT rainfall FROM rs485_weather_data WHERE station_id=$1 AND timestamp <= $2 ORDER BY timestamp DESC LIMIT 1`
+	_ = database.GetDB().QueryRowContext(ctx, qBase, stationID, dayStart).Scan(&baseline)
+
+	var current sql.NullFloat64
+	const qCur = `SELECT rainfall FROM rs485_weather_data WHERE station_id=$1 ORDER BY timestamp DESC LIMIT 1`
+	_ = database.GetDB().QueryRowContext(ctx, qCur, stationID).Scan(&current)
+
+	if !current.Valid || !baseline.Valid {
+		return 0, nil
+	}
+	v := current.Float64 - baseline.Float64
+	if v < 0 {
+		v = 0
+	}
+	return v, nil
+}