J01- Non transaction meter values

- evseId =0 values
* Send IdleMeasurements
* Add phase rotation varaible

config/v201/component_schemas/standardized/ChargingStation.json

@@ -35,6 +35,21 @@
       "description": "This variable reports current availability state for the ChargingStation",
       "type": "string"
     },
+    "ChargingStationPhaseRotation": {
+      "variable_name": "PhaseRotation",
+      "characteristics": {
+        "supportsMonitoring": true,
+        "dataType": "string"
+      },
+      "attributes": [
+        {
+          "type": "Actual",
+          "mutability": "ReadWrite"
+        }
+      ],
+      "description": "This variable describes the phase rotation of a Component relative to its parent Component, using a three letter string consisting of the letters: R, S, T and x.",
+      "type": "string"
+    },
     "ChargingStationAvailable": {
       "variable_name": "Available",
       "characteristics": {

config/v201/config.json

@@ -428,6 +428,12 @@
                 "attributes": {
                     "Actual": "Energy.Active.Import.Register"
                 }
+            },
+            "AlignedDataSendDuringIdle": {
+                "variable_name": "SendDuringIdle",
+                "attributes": {
+                    "Actual": false
+                }
             }
         }
     },
@@ -497,6 +503,12 @@
                 "attributes": {
                     "Actual": 42
                 }
+            },
+            "ChargingStationPhaseRotation": {
+                "variable_name": "PhaseRotation",
+                "attributes": {
+                    "Actual": "RST"
+                }
             }
         }
     },
@@ -658,4 +670,4 @@
             }
         }
     }
-]
+]

include/ocpp/v201/charge_point.hpp

@@ -165,6 +165,9 @@ class ChargePoint : ocpp::ChargingStationBase {
     std::map<EvseConnectorPair, ConnectorStatusEnum> conn_state_per_evse;
     std::chrono::time_point<std::chrono::steady_clock> time_disconnected;
 
+    MeterValue meter_value; // represents evseId = 0 meter value
+    std::mutex meter_value_mutex;
+
     /// \brief Used when an 'OnIdle' reset is requested, to perform the reset after the charging has stopped.
     bool reset_scheduled;
     /// \brief If `reset_scheduled` is true and the reset is for a specific evse id, it will be stored in this member.
@@ -262,6 +265,11 @@ class ChargePoint : ocpp::ChargingStationBase {
     /// @brief Get the value optional offline flag
     /// @return true if the charge point is offline. std::nullopt if it is online;
     bool is_offline();
+
+    /// \brief Returns the last present meter value for evseId 0
+    /// \return MeterValue
+    MeterValue get_meter_value();
+
     /* OCPP message requests */
 
     // Functional Block A: Security

lib/ocpp/v201/charge_point.cpp

@@ -320,7 +320,18 @@ void ChargePoint::on_session_finished(const int32_t evse_id, const int32_t conne
 }
 
 void ChargePoint::on_meter_value(const int32_t evse_id, const MeterValue& meter_value) {
-    this->evses.at(evse_id)->on_meter_value(meter_value);
+    if (evse_id == 0) {
+        std::lock_guard<std::mutex> lk(this->meter_value_mutex);
+        // if evseId = 0 then store in the chargepoint metervalues
+        this->meter_value = meter_value;
+    } else {
+        this->evses.at(evse_id)->on_meter_value(meter_value);
+    }
+}
+
+MeterValue ChargePoint::get_meter_value() {
+    std::lock_guard<std::mutex> lk(this->meter_value_mutex);
+    return this->meter_value;
 }
 
 void ChargePoint::on_unavailable(const int32_t evse_id, const int32_t connector_id) {
@@ -897,6 +908,7 @@ void ChargePoint::update_aligned_data_interval() {
         EVLOG_debug << "Next meter value will be sent at: " << next_timestamp.value().to_rfc3339();
         this->aligned_meter_values_timer.at(
             [this]() {
+                bool transaction_active = false;
                 for (auto const& [evse_id, evse] : this->evses) {
                     auto _meter_value = evse->get_meter_value();
                     // this will apply configured measurands and possibly reduce the entries of sampledValue
@@ -906,6 +918,7 @@ void ChargePoint::update_aligned_data_interval() {
                                                         ControllerComponentVariables::AlignedDataMeasurands);
 
                     if (evse->has_active_transaction()) {
+                        transaction_active = true;
                         // because we do not actively read meter values at clock aligned timepoint, we switch the
                         // ReadingContext here
                         for (auto& sampled_value : _meter_value.sampledValue) {
@@ -926,12 +939,28 @@ void ChargePoint::update_aligned_data_interval() {
                                this->device_model
                                    ->get_optional_value<bool>(ControllerComponentVariables::AlignedDataSendDuringIdle)
                                    .value_or(false)) {
+                        transaction_active = false;
                         if (!meter_value.sampledValue.empty()) {
                             // J01.FR.14 this is the only case where we send a MeterValue.req
                             this->meter_values_req(evse_id, std::vector<ocpp::v201::MeterValue>(1, meter_value));
                         }
                     }
                 }
+                // also send meter values for evseId 0 if no transactions are on going
+                if (!transaction_active) {
+                    auto _meter_value = this->get_meter_value();
+
+                    // this will apply configured measurands and possibly reduce the entries of sampledValue
+                    // according to the configuration
+                    const auto meter_value =
+                        get_latest_meter_value_filtered(_meter_value, ReadingContextEnum::Sample_Clock,
+                                                        ControllerComponentVariables::AlignedDataMeasurands);
+
+                    if (!meter_value.sampledValue.empty()) {
+                        this->meter_values_req(0, std::vector<ocpp::v201::MeterValue>(1, meter_value));
+                    }
+                }
+
                 this->update_aligned_data_interval();
             },
             next_timestamp.value().to_time_point());

lib/ocpp/v201/ctrlr_component_variables.cpp

@@ -352,6 +352,14 @@ const ComponentVariable& ChargingStationAvailabilityState = {
         "AvailabilityState",
     }),
 };
+const ComponentVariable& ChargingStationPhaseRotation = {
+    ControllerComponents::ChargingStation,
+    std::nullopt,
+    std::optional<Variable>({
+        "PhaseRotation",
+    }),
+};
+
 const ComponentVariable& ChargingStationAvailable = {
     ControllerComponents::ChargingStation,
     std::nullopt,