Add status command

cmd/daemon/main.go

@@ -35,7 +35,7 @@ func main() {
 	flag.DurationVar(&pollInterval, "pollInterval", time.Minute, "Poll interval, example: 60s")
 	flag.Parse()
 
-	if gatewayEndpoint == "" {
+	if gatewayEndpoint == "" || inverterAddr == "" {
 		flag.Usage()
 		os.Exit(1)
 	}

cmd/status/main.go

@@ -0,0 +1,45 @@
+package main
+
+import (
+	"context"
+	"encoding/json"
+	"flag"
+	"fmt"
+	"log"
+	"net"
+	"os"
+
+	"git.netflux.io/rob/solar-toolkit/inverter"
+)
+
+func main() {
+	var inverterAddr string
+
+	flag.StringVar(&inverterAddr, "inverter-addr", "", "IP+port of solar inverter")
+	flag.Parse()
+
+	if inverterAddr == "" {
+		flag.Usage()
+		os.Exit(1)
+	}
+
+	conn, err := net.Dial("udp", inverterAddr)
+	if err != nil {
+		log.Fatalf("error dialing: %s", err)
+	}
+	defer conn.Close()
+
+	var inv inverter.ET
+
+	runtimeData, err := inv.RuntimeData(context.Background(), conn)
+	if err != nil {
+		log.Fatalf("error fetching runtime data: %s", err)
+	}
+
+	json, err := json.Marshal(runtimeData)
+	if err != nil {
+		log.Fatalf("error encoding runtime data: %s", err)
+	}
+
+	fmt.Fprint(os.Stdout, string(json))
+}