add support for barometric pressure

internal/config/config.go

@@ -3,6 +3,7 @@ package config
 import (
 	"errors"
 	"os"
+	"strings"
 	"time"
 
 	"gopkg.in/yaml.v3"
@@ -12,12 +13,13 @@ type Config struct {
 	LogLevel string `yaml:"log_level"`
 
 	MQTT struct {
-		Broker   string `yaml:"broker"`
-		ClientID string `yaml:"client_id"`
-		Username string `yaml:"username"`
-		Password string `yaml:"password"`
-		Topic    string `yaml:"topic"`
-		QoS      byte   `yaml:"qos"`
+		Broker   string      `yaml:"broker"`
+		ClientID string      `yaml:"client_id"`
+		Username string      `yaml:"username"`
+		Password string      `yaml:"password"`
+		Topic    string      `yaml:"topic"`
+		QoS      byte        `yaml:"qos"`
+		Topics   []MQTTTopic `yaml:"topics"`
 	} `yaml:"mqtt"`
 
 	DB struct {
@@ -52,6 +54,13 @@ type Config struct {
 	} `yaml:"wunderground"`
 }
 
+type MQTTTopic struct {
+	Name  string `yaml:"name"`
+	Topic string `yaml:"topic"`
+	Type  string `yaml:"type"`
+	QoS   *byte  `yaml:"qos"`
+}
+
 func Load(path string) (*Config, error) {
 	b, err := os.ReadFile(path)
 	if err != nil {
@@ -64,8 +73,31 @@ func Load(path string) (*Config, error) {
 	}
 
 	// Minimal validation
-	if c.MQTT.Broker == "" || c.MQTT.Topic == "" {
-		return nil, errors.New("mqtt broker and topic are required")
+	if c.MQTT.Broker == "" {
+		return nil, errors.New("mqtt broker is required")
+	}
+	if len(c.MQTT.Topics) == 0 && c.MQTT.Topic != "" {
+		qos := c.MQTT.QoS
+		c.MQTT.Topics = []MQTTTopic{{
+			Name:  "ws90",
+			Topic: c.MQTT.Topic,
+			Type:  "ws90",
+			QoS:   &qos,
+		}}
+	}
+	if len(c.MQTT.Topics) == 0 {
+		return nil, errors.New("mqtt topic(s) are required")
+	}
+	for i := range c.MQTT.Topics {
+		t := c.MQTT.Topics[i]
+		if t.Topic == "" {
+			return nil, errors.New("mqtt topics must include topic")
+		}
+		if t.Type == "" {
+			t.Type = "ws90"
+		}
+		t.Type = strings.ToLower(t.Type)
+		c.MQTT.Topics[i] = t
 	}
 	if c.DB.ConnString == "" {
 		return nil, errors.New("db conn_string is required")