Add cFos PowerBrain (evcc-io#1809)

Co-authored-by: premultiply <ulrich.peters@posteo.de>

README.md

@@ -14,7 +14,7 @@ EVCC is an extensible EV Charge Controller with PV integration implemented in [G
 - simple and clean user interface
 - multiple [chargers](#charger):
   - Open source: [openWB](https://openwb.de/), [EVSEWifi](https://www.evse-wifi.de) (includes smartWB)
-  - Other commercial: ABL eMH1, go-eCharger, Heidelberg Energy Control, KEBA/BMW, NRGkick, Wallbe, Mobile Charger Connect, EEBUS (experimental)
+  - Closed source: ABL eMH1, cFos PowerBrain, go-eCharger, Heidelberg Energy Control, KEBA/BMW, NRGkick, Wallbe, Mobile Charger Connect, EEBUS (experimental)
   - Build-your-own: Phoenix (includes ESL Walli), [SimpleEVSE](https://www.evse-wifi.de/produkt-schlagwort/simple-evse-wb/)
   - Smart-Home outlets: FritzDECT, Shelly, Tasmota, TP-Link
 - multiple [meters](#meter): ModBus (Eastron SDM, MPM3PM, SBC ALE3 and many more), Discovergy (using HTTP plugin), SMA Sunny Home Manager and Energy Meter, KOSTAL Smart Energy Meter (KSEM, EMxx), any Sunspec-compatible inverter or home battery devices (Fronius, SMA, SolarEdge, KOSTAL, STECA, E3DC, ...), Tesla PowerWall, LG ESS HOME
@@ -188,6 +188,7 @@ Charger is responsible for handling EV state and adjusting charge current.
 Available charger implementations are:
 
 - `abl`: ABL eMH1 (requires Modbus adapter; [sponsors only](#sponsorship))
+- `cfos`: cFos PowerBrain charger (meters must configured separately, [sponsors only](#sponsorship))
 - `easee`: Easee Home charger ([sponsors only](#sponsorship))
 - `eebus`: EEBUS compatible chargers (experimental)
 - `evsewifi`: chargers with SimpleEVSE controllers using [EVSE-WiFi](https://www.evse-wifi.de/) (includes smartWB)

charger/cfos.go

@@ -0,0 +1,126 @@
+package charger
+
+import (
+	"errors"
+
+	"github.com/evcc-io/evcc/api"
+	"github.com/evcc-io/evcc/util"
+	"github.com/evcc-io/evcc/util/modbus"
+	"github.com/evcc-io/evcc/util/sponsor"
+)
+
+const (
+	cfosRegStatus     = 8092 // Input
+	cfosRegMaxCurrent = 8093 // Holding
+	cfosRegEnable     = 8094 // Coil
+)
+
+// CfosPowerBrain is an charger implementation for cFos PowerBrain wallboxes.
+// It uses Modbus TCP to communicate at modbus client id 1 and power meters at id 2 and 3.
+// https://www.cfos-emobility.de/en-gb/cfos-power-brain/modbus-registers.htm
+type CfosPowerBrain struct {
+	conn *modbus.Connection
+}
+
+func init() {
+	registry.Add("cfos", NewCfosPowerBrainFromConfig)
+}
+
+// NewCfosPowerBrainFromConfig creates a cFos charger from generic config
+func NewCfosPowerBrainFromConfig(other map[string]interface{}) (api.Charger, error) {
+	cc := struct {
+		URI string
+		ID  uint8
+	}{
+		ID: 1,
+	}
+
+	if err := util.DecodeOther(other, &cc); err != nil {
+		return nil, err
+	}
+
+	return NewCfosPowerBrain(cc.URI, cc.ID)
+}
+
+// NewCfosPowerBrain creates a cFos charger
+func NewCfosPowerBrain(uri string, id uint8) (*CfosPowerBrain, error) {
+	uri = util.DefaultPort(uri, 4701)
+
+	conn, err := modbus.NewConnection(uri, "", "", 0, modbus.TcpFormat, id)
+	if err != nil {
+		return nil, err
+	}
+
+	log := util.NewLogger("cfos")
+	conn.Logger(log.TRACE)
+
+	if !sponsor.IsAuthorized() {
+		return nil, api.ErrSponsorRequired
+	}
+
+	wb := &CfosPowerBrain{
+		conn: conn,
+	}
+
+	return wb, nil
+}
+
+// Status implements the Charger.Status interface
+func (wb *CfosPowerBrain) Status() (api.ChargeStatus, error) {
+	b, err := wb.conn.ReadHoldingRegisters(cfosRegStatus, 1)
+	if err != nil {
+		return api.StatusNone, err
+	}
+
+	switch b[0] {
+	case 0: // warten
+		return api.StatusA, nil
+	case 1: // Fahrzeug erkannt
+		return api.StatusB, nil
+	case 2: // laden
+		return api.StatusC, nil
+	case 3: // laden mit Kühlung
+		return api.StatusD, nil
+	case 4: // kein Strom
+		return api.StatusE, nil
+	case 5: // Fehler
+		return api.StatusF, nil
+	default:
+		return api.StatusNone, errors.New("invalid response")
+	}
+}
+
+// Enabled implements the Charger.Enabled interface
+func (wb *CfosPowerBrain) Enabled() (bool, error) {
+	b, err := wb.conn.ReadHoldingRegisters(cfosRegEnable, 1)
+	if err != nil {
+		return false, err
+	}
+
+	return b[0] == 1, nil
+}
+
+// Enable implements the Charger.Enable interface
+func (wb *CfosPowerBrain) Enable(enable bool) error {
+	var u uint16
+	if enable {
+		u = 1
+	}
+
+	_, err := wb.conn.WriteSingleCoil(cfosRegEnable, u)
+
+	return err
+}
+
+// MaxCurrent implements the Charger.MaxCurrent interface
+func (wb *CfosPowerBrain) MaxCurrent(current int64) error {
+	return wb.MaxCurrentMillis(float64(current))
+}
+
+var _ api.ChargerEx = (*CfosPowerBrain)(nil)
+
+// MaxCurrentMillis implements the api.ChargerEx interface
+func (wb *CfosPowerBrain) MaxCurrentMillis(current float64) error {
+	_, err := wb.conn.WriteSingleRegister(cfosRegMaxCurrent, uint16(current*10))
+	return err
+}

meter/cfos.go

@@ -0,0 +1,97 @@
+package meter
+
+import (
+	"encoding/binary"
+
+	"github.com/evcc-io/evcc/api"
+	"github.com/evcc-io/evcc/util"
+	"github.com/evcc-io/evcc/util/modbus"
+)
+
+const (
+	cfosRegEnergy = 8058 // energy reading
+	cfosRegPower  = 8062 // power reading
+)
+
+var cfosRegCurrents = []uint16{8064, 8066, 8068} // current readings
+
+// CfosPowerBrain is a meter implementation for cFos PowerBrain wallboxes.
+// It uses Modbus TCP to communicate at modbus client id 1 and power meters at id 2 and 3.
+// https://www.cfos-emobility.de/en-gb/cfos-power-brain/modbus-registers.htm
+type CfosPowerBrain struct {
+	conn *modbus.Connection
+}
+
+func init() {
+	registry.Add("cfos", NewCfosPowerBrainFromConfig)
+}
+
+// NewCfosPowerBrainFromConfig creates a cFos meter from generic config
+func NewCfosPowerBrainFromConfig(other map[string]interface{}) (api.Meter, error) {
+	cc := struct {
+		URI string
+		ID  uint8
+	}{}
+
+	if err := util.DecodeOther(other, &cc); err != nil {
+		return nil, err
+	}
+
+	return NewCfosPowerBrain(cc.URI, cc.ID)
+}
+
+// NewCfosPowerBrain creates a cFos meter
+func NewCfosPowerBrain(uri string, id uint8) (*CfosPowerBrain, error) {
+	conn, err := modbus.NewConnection(uri, "", "", 0, modbus.TcpFormat, id)
+	if err != nil {
+		return nil, err
+	}
+
+	log := util.NewLogger("cfos")
+	conn.Logger(log.TRACE)
+
+	wb := &CfosPowerBrain{
+		conn: conn,
+	}
+
+	return wb, nil
+}
+
+// CurrentPower implements the api.Meter interface
+func (wb *CfosPowerBrain) CurrentPower() (float64, error) {
+	b, err := wb.conn.ReadHoldingRegisters(cfosRegPower, 2)
+	if err != nil {
+		return 0, err
+	}
+
+	return float64(binary.BigEndian.Uint32(b)) / 10, err
+}
+
+var _ api.MeterEnergy = (*CfosPowerBrain)(nil)
+
+// TotalEnergy implements the api.MeterEnergy interface
+func (wb *CfosPowerBrain) TotalEnergy() (float64, error) {
+	b, err := wb.conn.ReadHoldingRegisters(cfosRegEnergy, 4)
+	if err != nil {
+		return 0, err
+	}
+
+	return float64(binary.BigEndian.Uint64(b)) / 1e3, err
+}
+
+var _ api.MeterCurrent = (*CfosPowerBrain)(nil)
+
+// Currents implements the api.MeterCurrent interface
+func (wb *CfosPowerBrain) Currents() (float64, float64, float64, error) {
+	var currents []float64
+	for _, regCurrent := range cfosRegCurrents {
+		b, err := wb.conn.ReadHoldingRegisters(regCurrent, 2)
+		if err != nil {
+			return 0, 0, 0, err
+		}
+
+		currents = append(currents, float64(binary.BigEndian.Uint32(b))/10)
+	}
+
+	return currents[0], currents[1], currents[2], nil
+}