Read grid and charge meter currents (evcc-io#272)

core/loadpoint.go

@@ -405,13 +405,21 @@ func (lp *LoadPoint) updateChargerStatus() error {
 
 // detectPhases uses MeterCurrent interface to count phases with current >=1A
 func (lp *LoadPoint) detectPhases() {
-	if phaseMeter, ok := lp.chargeMeter.(api.MeterCurrent); ok {
-		i1, i2, i3, err := phaseMeter.Currents()
-		if err != nil {
-			lp.log.ERROR.Printf("charge meter error: %v", err)
-			return
-		}
+	phaseMeter, ok := lp.chargeMeter.(api.MeterCurrent)
+	if !ok {
+		return
+	}
 
+	i1, i2, i3, err := phaseMeter.Currents()
+	if err != nil {
+		lp.log.ERROR.Printf("charge meter error: %v", err)
+		return
+	}
+
+	lp.log.TRACE.Printf("charge currents: %vA", []float64{i1, i2, i3})
+	lp.publish("chargeCurrents", []float64{i1, i2, i3})
+
+	if lp.charging {
 		var phases int64
 		for _, i := range []float64{i1, i2, i3} {
 			if i >= minActiveCurrent {
@@ -630,10 +638,8 @@ func (lp *LoadPoint) Update(sitePower float64) {
 		lp.handler.SyncEnabled()
 	}
 
-	// phase detection - run only when actually charging
-	if lp.charging {
-		lp.detectPhases()
-	}
+	// phase detection
+	lp.detectPhases()
 
 	// check if car connected and ready for charging
 	var err error

core/site.go

@@ -282,6 +282,15 @@ func (site *Site) updateMeters() error {
 		err = retryMeter("battery", site.batteryMeter, &site.batteryPower)
 	}
 
+	// currents
+	if phaseMeter, ok := site.gridMeter.(api.MeterCurrent); err == nil && ok {
+		i1, i2, i3, err := phaseMeter.Currents()
+		if err == nil {
+			site.log.TRACE.Printf("grid currents: %vA", []float64{i1, i2, i3})
+			site.publish("gridCurrents", []float64{i1, i2, i3})
+		}
+	}
+
 	return err
 }
 

server/influxdb.go

@@ -49,6 +49,24 @@ func NewInfluxClient(url, token, org, user, password, database string) *Influx {
 	}
 }
 
+// supportedType checks if type can be written as influx value
+func (m *Influx) supportedType(p util.Param) bool {
+	if p.Val == nil {
+		return true
+	}
+
+	switch val := p.Val.(type) {
+	case float64:
+		return true
+	case [3]float64:
+		return true
+	case []float64:
+		return len(val) == 3
+	default:
+		return false
+	}
+}
+
 // Run Influx publisher
 func (m *Influx) Run(loadPoints []*core.LoadPoint, in <-chan util.Param) {
 	writer := m.client.WriteApi(m.org, m.database)
@@ -62,8 +80,7 @@ func (m *Influx) Run(loadPoints []*core.LoadPoint, in <-chan util.Param) {
 
 	// add points to batch for async writing
 	for param := range in {
-		// allow nil value to be written as series gaps
-		if _, ok := param.Val.(float64); param.Val != nil && !ok {
+		if !m.supportedType(param) {
 			continue
 		}
 
@@ -72,10 +89,28 @@ func (m *Influx) Run(loadPoints []*core.LoadPoint, in <-chan util.Param) {
 			tags["loadpoint"] = loadPoints[*param.LoadPoint].Name()
 		}
 
-		fields := map[string]interface{}{
-			"value": param.Val,
+		fields := map[string]interface{}{}
+
+		// array to slice
+		val := param.Val
+		if v, ok := val.([3]float64); ok {
+			val = v[:]
 		}
 
+		// add slice as phase values
+		if phases, ok := val.([]float64); ok {
+			var total float64
+			for i, v := range phases {
+				total += v
+				fields[fmt.Sprintf("l%d", i+1)] = v
+			}
+
+			// add total as "value"
+			val = total
+		}
+
+		fields["value"] = val
+
 		// write asynchronously
 		m.log.TRACE.Printf("write %s=%v (%v)", param.Key, param.Val, tags)
 		p := influxdb2.NewPoint(param.Key, tags, fields, time.Now())

server/mqtt.go

@@ -44,11 +44,27 @@ func (m *MQTT) encode(v interface{}) string {
 	return s
 }
 
-func (m *MQTT) publish(topic string, retained bool, payload interface{}) {
+func (m *MQTT) publishSingleValue(topic string, retained bool, payload interface{}) {
 	token := m.Handler.Client.Publish(topic, m.Handler.Qos, retained, m.encode(payload))
 	go m.Handler.WaitForToken(token)
 }
 
+func (m *MQTT) publish(topic string, retained bool, payload interface{}) {
+	if slice, ok := payload.([]float64); ok && len(slice) == 3 {
+		// publish phase values
+		var total float64
+		for i, v := range slice {
+			total += v
+			m.publishSingleValue(fmt.Sprintf("%s/l%d", topic, i+1), retained, v)
+		}
+
+		// publish sum value
+		payload = total
+	}
+
+	m.publishSingleValue(topic, retained, payload)
+}
+
 type apiHandler interface {
 	SetMode(api.ChargeMode)
 	SetTargetSoC(int)