FIXES

interfaces/evse_manager.yaml

@@ -168,10 +168,6 @@ vars:
     description: Measured dataset
     type: object
     $ref: /powermeter#/Powermeter
-  transaction_meter_value:
-    description: Signed meter value attached to transaction context
-    type: object
-    $ref: /units_signed#/TransactionMeterValue
   evse_id:
     description: EVSE ID including the connector number, e.g. DE*PNX*E123456*1
     type: string

modules/EvseManager/Charger.cpp

@@ -1056,8 +1056,6 @@ bool Charger::start_transaction() {
     shared_context.stop_transaction_id_token.reset();
     shared_context.transaction_active = true;
 
-    // The `TransactionStarted` is a time critical event. We send it before
-    // trying to sign the meter values, which takes time to complete.
     const types::powermeter::TransactionReq req{evse_id, "", "", 0, 0, ""};
     for (const auto& meter : r_powermeter_billing) {
         const auto response = meter->call_start_transaction(req);
@@ -1088,6 +1086,7 @@ void Charger::stop_transaction() {
             EVLOG_error << "Failed to stop a transaction on the power meter " << response.error.value_or("");
             break;
         } else if (response.status == types::powermeter::TransactionRequestStatus::OK) {
+            shared_context.start_signed_meter_value = response.start_signed_meter_value;
             shared_context.stop_signed_meter_value = response.signed_meter_value;
             break;
         }

modules/EvseManager/evse/evse_managerImpl.cpp

@@ -275,6 +275,7 @@ void evse_managerImpl::ready() {
                     transaction_finished.meter_value.energy_Wh_export.value().total;
             }
 
+            transaction_finished.start_signed_meter_value = mod->charger->get_start_signed_meter_value();
             transaction_finished.signed_meter_value = mod->charger->get_stop_signed_meter_value();
             mod->telemetry.publish("session", "events", telemetry_data);
 

types/evse_manager.yaml

@@ -215,6 +215,10 @@ types:
         description: Transaction finished meter value
         type: object
         $ref: /powermeter#/Powermeter
+      start_signed_meter_value:
+        description: The starting signed meter value report of the stopped transaction. If not included in the `signed_meter_value` object, it must be included here.
+        type: object
+        $ref: /units_signed#/SignedMeterValue
       signed_meter_value:
         description: The signed meter value report of the stopped transaction
         type: object

types/powermeter.yaml

@@ -82,7 +82,7 @@ types:
         description: If status is not OK, a verbose error message.
         type: string
   Powermeter:
-    description: Measured dataset (AC or DC). Represents live measure snapshot.
+    description: Measured dataset (AC or DC.
     type: object
     additionalProperties: false
     required:

types/units_signed.yaml

@@ -153,34 +153,4 @@ types:
         description: VAR phase C
         type: object
         $ref: /units_signed#/SignedMeterValue
-  SignedMeterValueContext:
-    description: Context of the signed value within the transaction.
-    type: string
-    enum:
-      # Signed value belongs to transaction start
-      - TRANSACTION_START
-      # Signed value belongs to transaction stop
-      - TRANSACTION_STOP
-      # Signed value taken in the middle of transaction
-      - CURRENT
-      # Signed value includes whole set of measuremtes for transaction
-      - TRANSACTION
-  TransactionMeterValue:
-    description: Signed meter value attached to transaction context
-    type: object
-    required:
-      - transaction_id
-      - signed_meter_value
-      - signature_context
-    properties:
-      transaction_id:
-        description: OCPP transaction UUID
-        type: string
-      signed_meter_value:
-        description: The signed meter data.
-        type: object
-        $ref: /units_signed#/SignedMeterValue
-      signature_context:
-        description: Context of the signed value.
-        type: string
-        $ref: /units_signed#/SignedMeterValueContext
+