Ocpp: async RemoteStartTransaction by StatusNotification

charger/ocpp.go

@@ -22,13 +22,11 @@ type OCPP struct {
 	log     *util.Logger
 	cp      *ocpp.CP
 	conn    *ocpp.Connector
-	idtag   string
 	phases  int
 	enabled bool
 	current float64
 
 	timeout        time.Duration
-	remoteStart    bool
 	stackLevelZero bool
 	lp             loadpoint.API
 }
@@ -160,21 +158,19 @@ func NewOCPP(id string, connector int, idtag string,
 		return nil, fmt.Errorf("invalid connector: %d", connector)
 	}
 
-	conn, err := ocpp.NewConnector(log, connector, cp, timeout)
-	if err != nil {
-		return nil, err
-	}
-
 	if idtag == defaultIdTag && cp.IdTag != "" {
 		idtag = cp.IdTag
 	}
 
+	conn, err := ocpp.NewConnector(log, connector, cp, timeout, remoteStart, idtag)
+	if err != nil {
+		return nil, err
+	}
+
 	c := &OCPP{
 		log:            log,
 		cp:             cp,
 		conn:           conn,
-		idtag:          idtag,
-		remoteStart:    remoteStart,
 		stackLevelZero: stackLevelZero,
 		timeout:        timeout,
 	}
@@ -195,13 +191,6 @@ func (c *OCPP) Connector() *ocpp.Connector {
 	return c.conn
 }
 
-func (c *OCPP) effectiveIdTag() string {
-	if idtag := c.conn.IdTag(); idtag != "" {
-		return idtag
-	}
-	return c.idtag
-}
-
 // wait waits for a CP roundtrip with timeout
 func (c *OCPP) wait(err error, rc chan error) error {
 	return ocpp.Wait(err, rc, c.timeout)
@@ -214,18 +203,6 @@ func (c *OCPP) Status() (api.ChargeStatus, error) {
 		return api.StatusNone, err
 	}
 
-	if c.conn.NeedsAuthentication() {
-		if c.remoteStart {
-			// lock the cable by starting remote transaction after vehicle connected
-			if err := c.initTransaction(); err != nil {
-				c.log.WARN.Printf("failed to start remote transaction: %v", err)
-			}
-		} else {
-			// TODO: bring this status to UI
-			c.log.WARN.Printf("waiting for local authentication")
-		}
-	}
-
 	switch status {
 	case
 		core.ChargePointStatusAvailable,   // "Available"
@@ -321,22 +298,6 @@ func (c *OCPP) Enable(enable bool) error {
 	return err
 }
 
-func (c *OCPP) initTransaction() error {
-	rc := make(chan error, 1)
-	err := ocpp.Instance().RemoteStartTransaction(c.cp.ID(), func(resp *core.RemoteStartTransactionConfirmation, err error) {
-		if err == nil && resp != nil && resp.Status != types.RemoteStartStopStatusAccepted {
-			err = errors.New(string(resp.Status))
-		}
-
-		rc <- err
-	}, c.effectiveIdTag(), func(request *core.RemoteStartTransactionRequest) {
-		connector := c.conn.ID()
-		request.ConnectorId = &connector
-	})
-
-	return c.wait(err, rc)
-}
-
 func (c *OCPP) setChargingProfile(profile *types.ChargingProfile) error {
 	rc := make(chan error, 1)
 	err := ocpp.Instance().SetChargingProfile(c.cp.ID(), func(resp *smartcharging.SetChargingProfileConfirmation, err error) {

charger/ocpp/connector.go

@@ -1,6 +1,7 @@
 package ocpp
 
 import (
+	"errors"
 	"fmt"
 	"strconv"
 	"strings"
@@ -32,9 +33,12 @@ type Connector struct {
 	txnCount int // change initial value to the last known global transaction. Needs persistence
 	txnId    int
 	idTag    string
+
+	remoteStart bool
+	remoteIdTag string
 }
 
-func NewConnector(log *util.Logger, id int, cp *CP, timeout time.Duration) (*Connector, error) {
+func NewConnector(log *util.Logger, id int, cp *CP, timeout time.Duration, remoteStart bool, remoteIdTag string) (*Connector, error) {
 	conn := &Connector{
 		log:          log,
 		cp:           cp,
@@ -43,6 +47,8 @@ func NewConnector(log *util.Logger, id int, cp *CP, timeout time.Duration) (*Con
 		statusC:      make(chan struct{}, 1),
 		measurements: make(map[types.Measurand]types.SampledValue),
 		timeout:      timeout,
+		remoteStart:  remoteStart,
+		remoteIdTag:  remoteIdTag,
 	}
 
 	err := cp.registerConnector(id, conn)
@@ -147,9 +153,33 @@ func (conn *Connector) NeedsAuthentication() bool {
 	conn.mu.Lock()
 	defer conn.mu.Unlock()
 
+	return conn.isWaitingForAuth()
+}
+
+// isWaitingForAuth checks if meter values are outdated.
+// Must only be called while holding lock.
+func (conn *Connector) isWaitingForAuth() bool {
 	return conn.status != nil && conn.txnId == 0 && conn.status.Status == core.ChargePointStatusPreparing
 }
 
+func (conn *Connector) initTransaction() {
+	rc := make(chan error, 1)
+	err := Instance().RemoteStartTransaction(conn.cp.ID(), func(resp *core.RemoteStartTransactionConfirmation, err error) {
+		if err == nil && resp != nil && resp.Status != types.RemoteStartStopStatusAccepted {
+			err = errors.New(string(resp.Status))
+		}
+
+		rc <- err
+	}, conn.remoteIdTag, func(request *core.RemoteStartTransactionRequest) {
+		connector := conn.id
+		request.ConnectorId = &connector
+	})
+
+	if err := Wait(err, rc, conn.timeout); err != nil {
+		conn.log.WARN.Printf("failed to start remote transaction: %v", err)
+	}
+}
+
 // isMeterTimeout checks if meter values are outdated.
 // Must only be called while holding lock.
 func (conn *Connector) isMeterTimeout() bool {

charger/ocpp/connector_core.go

@@ -37,6 +37,14 @@ func (conn *Connector) StatusNotification(request *core.StatusNotificationReques
 		conn.log.TRACE.Printf("ignoring status: %s < %s", request.Timestamp.Time, conn.status.Timestamp)
 	}
 
+	if conn.isWaitingForAuth() {
+		if conn.remoteStart {
+			defer conn.initTransaction()
+		} else {
+			defer conn.log.DEBUG.Printf("waiting for local authentication")
+		}
+	}
+
 	return new(core.StatusNotificationConfirmation), nil
 }
 

charger/ocpp/connector_test.go

@@ -24,7 +24,7 @@ type connTestSuite struct {
 
 func (suite *connTestSuite) SetupTest() {
 	suite.cp = NewChargePoint(util.NewLogger("foo"), "abc")
-	suite.conn, _ = NewConnector(util.NewLogger("foo"), 1, suite.cp, time.Minute)
+	suite.conn, _ = NewConnector(util.NewLogger("foo"), 1, suite.cp, time.Minute, false, "")
 
 	suite.clock = clock.NewMock()
 	suite.conn.clock = suite.clock

charger/ocpp/cp_core.go

@@ -21,7 +21,6 @@ var (
 )
 
 func (cp *CP) Authorize(request *core.AuthorizeRequest) (*core.AuthorizeConfirmation, error) {
-	// TODO check if this authorizes foreign RFID tags
 	res := &core.AuthorizeConfirmation{
 		IdTagInfo: &types.IdTagInfo{
 			Status: types.AuthorizationStatusAccepted,
@@ -34,7 +33,7 @@ func (cp *CP) Authorize(request *core.AuthorizeRequest) (*core.AuthorizeConfirma
 func (cp *CP) BootNotification(request *core.BootNotificationRequest) (*core.BootNotificationConfirmation, error) {
 	res := &core.BootNotificationConfirmation{
 		CurrentTime: types.Now(),
-		Interval:    60, // TODO
+		Interval:    60,
 		Status:      core.RegistrationStatusAccepted,
 	}
 
@@ -58,16 +57,11 @@ func (cp *CP) StatusNotification(request *core.StatusNotificationRequest) (*core
 		return nil, ErrInvalidRequest
 	}
 
-	if request.ConnectorId == 0 {
-		return new(core.StatusNotificationConfirmation), nil
+	if conn := cp.connectorByID(request.ConnectorId); conn != nil {
+		return conn.StatusNotification(request)
 	}
 
-	conn := cp.connectorByID(request.ConnectorId)
-	if conn == nil {
-		return nil, ErrInvalidConnector
-	}
-
-	return conn.StatusNotification(request)
+	return new(core.StatusNotificationConfirmation), nil
 }
 
 func (cp *CP) DataTransfer(request *core.DataTransferRequest) (*core.DataTransferConfirmation, error) {