Initial commit — energy collector (AlphaEss + SDM630 → TimescaleDB)

config.go

@@ -0,0 +1,52 @@
+package main
+
+import (
+	"encoding/json"
+	"os"
+)
+
+type Config struct {
+	SampleRate int         `json:"sample_rate"` // seconds
+	AlphaEss   AlphaConf  `json:"alphaess"`
+	MQTT       MQTTConf   `json:"mqtt"`
+	DB         DBConf     `json:"db"`
+}
+
+type AlphaConf struct {
+	Host    string `json:"host"`
+	Port    int    `json:"port"`
+	SlaveID uint8  `json:"slave_id"`
+}
+
+type MQTTConf struct {
+	Broker        string       `json:"broker"`
+	BrokerIP      string       `json:"broker_ip"`       // optional scoped IPv6 e.g. fe80::1%eth0
+	BrokerTLSName string       `json:"broker_tls_name"` // TLS ServerName when broker_ip is set
+	Port          int          `json:"port"`
+	ClientID      string       `json:"client_id"`
+	TopicPrefix   string       `json:"topic_prefix"`
+	CACert        string       `json:"ca_cert"`
+	ClientCert    string       `json:"client_cert"`
+	ClientKey     string       `json:"client_key"`
+	Devices       []DeviceConf `json:"devices"`
+}
+
+// DeviceConf describes one SDM630 meter reachable via the MQTT/Modbus bridge.
+type DeviceConf struct {
+	SlaveAddress int    `json:"slave_address"`
+	Name         string `json:"name"`    // used as the 'device' column value in power_meter
+	Segment      string `json:"segment"` // MQTT topic segment
+}
+
+type DBConf struct {
+	DSN string `json:"dsn"` // PostgreSQL connection string
+}
+
+func loadConfig(path string) (Config, error) {
+	data, err := os.ReadFile(path)
+	if err != nil {
+		return Config{}, err
+	}
+	var cfg Config
+	return cfg, json.Unmarshal(data, &cfg)
+}