From 10ad187618ab69f0730a005fedcf97c6b2ed1538 Mon Sep 17 00:00:00 2001
From: premultiply <4681172+premultiply@users.noreply.github.com>
Date: Sat, 3 May 2025 22:20:46 +0200
Subject: [PATCH] Mennekes-Compact: fix reboot and phase switching (#20579)

Co-authored-by: andig <andi@evcc.io>
---
 charger/mennekes-compact.go | 28 ++++++++++++++++++++++------
 1 file changed, 22 insertions(+), 6 deletions(-)

diff --git a/charger/mennekes-compact.go b/charger/mennekes-compact.go
index 39495f41b..3989d167d 100644
--- a/charger/mennekes-compact.go
+++ b/charger/mennekes-compact.go
@@ -44,7 +44,7 @@ const (
 	mennekesRegEvseState            = 0x0100 // uint16
 	mennekesRegAuthorizationStatus  = 0x0101 // uint16
 	mennekesRegCpState              = 0x0108 // uint16
-	mennekesRegChargingCurrentEM    = 0x0302 // float32
+	mennekesRegChargingCurrentEM    = 0x0302 // float32 [Heartbeat]
 	mennekesRegPhaseOptionsHW       = 0x030C // uint16
 	mennekesRegGridPhasesConnected  = 0x0311 // uint16
 	mennekesRegAuthorization        = 0x0312 // uint16
@@ -53,9 +53,9 @@ const (
 	mennekesRegPower                = 0x0512 // float32
 	mennekesRegChargedEnergySession = 0x0B02 // float32
 	mennekesRegDurationSession      = 0x0B04 // uint32
-	mennekesRegHeartbeat            = 0x0D00 // uint16
+	mennekesRegHeartbeat            = 0x0D00 // uint16 [Heartbeat]
 	mennekesRegRequestedPhases      = 0x0D04 // uint16
-	mennekesRegChargingReleaseEM    = 0x0D05 // uint16
+	mennekesRegChargingReleaseEM    = 0x0D05 // uint16 [Heartbeat]
 	mennekesRegChargedEnergyTotal   = 0x1000 // float32
 
 	mennekesAllowed           = 1
@@ -148,13 +148,19 @@ func (wb *MennekesCompact) Status() (api.ChargeStatus, error) {
 	switch status := encoding.Uint16(b); status {
 	case 1:
 		return api.StatusA, nil
-
 	case 2, 3, 4:
 		return api.StatusB, nil
-
 	case 5:
 		return api.StatusC, nil
-
+	case 6:
+		b := make([]byte, 4)
+		if _, err := wb.conn.WriteMultipleRegisters(mennekesRegChargingCurrentEM, 2, b); err != nil {
+			return api.StatusNone, err
+		}
+		if _, err := wb.conn.WriteSingleRegister(mennekesRegChargingReleaseEM, mennekesAllowed); err != nil {
+			return api.StatusNone, err
+		}
+		return api.StatusNone, nil
 	default:
 		return api.StatusNone, fmt.Errorf("invalid status: %d", status)
 	}
@@ -280,7 +286,17 @@ func (wb *MennekesCompact) phases1p3p(phases int) error {
 		u = 1
 	}
 
+	// temporarily disable charger during phase switching
+	if en, err := wb.Enabled(); err == nil && en {
+		if err := wb.Enable(false); err != nil {
+			return err
+		}
+
+		defer wb.Enable(true)
+	}
+
 	_, err := wb.conn.WriteSingleRegister(mennekesRegRequestedPhases, u)
+
 	return err
 }