From 1be58587b967e0803aeb532c6bd1a1991973ef2a Mon Sep 17 00:00:00 2001
From: andig <andi@evcc.io>
Date: Fri, 4 Jul 2025 21:09:13 +0200
Subject: [PATCH] cli: add heartbeat option to charger/meter (#22170)

---
 cmd/charger.go | 10 ++++++++++
 cmd/flags.go   |  3 +++
 cmd/meter.go   |  4 ++++
 3 files changed, 17 insertions(+)

diff --git a/cmd/charger.go b/cmd/charger.go
index f29351aea..d75809484 100644
--- a/cmd/charger.go
+++ b/cmd/charger.go
@@ -3,6 +3,7 @@ package cmd
 import (
 	"strconv"
 	"strings"
+	"time"
 
 	"github.com/evcc-io/evcc/api"
 	"github.com/evcc-io/evcc/util/config"
@@ -27,6 +28,7 @@ func init() {
 	chargerCmd.Flags().Bool(flagDiagnose, false, flagDiagnoseDescription)
 	chargerCmd.Flags().BoolP(flagWakeup, "w", false, flagWakeupDescription)
 	chargerCmd.Flags().IntP(flagPhases, "p", 0, flagPhasesDescription)
+	chargerCmd.Flags().Bool(flagHeartbeat, false, flagHeartbeatDescription)
 }
 
 func runCharger(cmd *cobra.Command, args []string) {
@@ -117,6 +119,11 @@ func runCharger(cmd *cobra.Command, args []string) {
 		}
 	}
 
+	if ok, _ := cmd.Flags().GetBool(flagHeartbeat); flagUsed && ok {
+		log.INFO.Println("running heartbeat until interrupted (Ctrl-C to stop)")
+		time.Sleep(time.Hour)
+	}
+
 	if !flagUsed {
 		d := dumper{len: len(chargers)}
 		flag := cmd.Flag(flagDiagnose).Changed
@@ -129,6 +136,9 @@ func runCharger(cmd *cobra.Command, args []string) {
 				d.DumpDiagnosis(v)
 			}
 		}
+	} else if ok, _ := cmd.Flags().GetBool(flagHeartbeat); ok {
+		log.INFO.Println("running heartbeat (if any) until interrupted (Ctrl-C to stop)")
+		time.Sleep(time.Hour)
 	}
 
 	// wait for shutdown
diff --git a/cmd/flags.go b/cmd/flags.go
index 5d34301a6..c4a2736fc 100644
--- a/cmd/flags.go
+++ b/cmd/flags.go
@@ -65,6 +65,9 @@ const (
 	flagRepeatInterval            = "repeat-interval"
 	flagRepeatIntervalDescription = "Interval between repetitions"
 
+	flagHeartbeat            = "heartbeat"
+	flagHeartbeatDescription = "After command, continue running device heartbeats (if any) until interrupted"
+
 	flagDigits = "digits"
 	flagDelay  = "delay"
 	flagForce  = "force"
diff --git a/cmd/meter.go b/cmd/meter.go
index d2f0c573b..e07be80ff 100644
--- a/cmd/meter.go
+++ b/cmd/meter.go
@@ -22,6 +22,7 @@ func init() {
 	meterCmd.Flags().DurationP(flagBatteryModeWait, "w", 0, flagBatteryModeWaitDescription)
 	meterCmd.Flags().BoolP(flagRepeat, "r", false, flagRepeatDescription)
 	meterCmd.Flags().Duration(flagRepeatInterval, 0, flagRepeatIntervalDescription)
+	meterCmd.Flags().Bool(flagHeartbeat, false, flagHeartbeatDescription)
 }
 
 func runMeter(cmd *cobra.Command, args []string) {
@@ -83,6 +84,9 @@ func runMeter(cmd *cobra.Command, args []string) {
 			}
 			goto REPEAT
 		}
+	} else if ok, _ := cmd.Flags().GetBool(flagHeartbeat); ok {
+		log.INFO.Println("running heartbeat (if any) until interrupted (Ctrl-C to stop)")
+		time.Sleep(time.Hour)
 	}
 
 	// wait for shutdown