Additional documentation for powermeter start sequence or after commu…

…nication loss (#1019) Signed-off-by: florinmihut <[email protected]> Co-authored-by: Kai Hermann <[email protected]>
EVerest · Jan 30, 2025 · b65b846 · b65b846
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+```mermaid
+sequenceDiagram
+autonumber
+participant Powermeter
+participant EvseManager
+
+title Start of Powermeter or recovery after communication loss
+
+Note over Powermeter: Device communication (re)established
+
+Powermeter->>Powermeter: Request status from device
+Powermeter->>Powermeter: Detects a running transaction
+Powermeter->>Powermeter: Mark need_to_stop_transaction to true
+
+alt Next command is startTransaction
+    EvseManager->>Powermeter: startTransaction
+    Powermeter-->>Powermeter: stopTransaction
+    Note over Powermeter: internal triggered stopTransaction will not send <br>a response to EvseManager since no stopTransaction was issued
+    Powermeter->>Powermeter: Mark need_to_stop_transaction to false
+    Powermeter-->>EvseManager: startTransaction Response (OK/ID)
+    Powermeter->>Powermeter: Mark need_to_stop_transaction to true
+
+    Note over EvseManager: Transaction started successfully
+
+else Next command is stopTransaction
+    EvseManager->>Powermeter: stopTransaction
+    Powermeter-->>EvseManager: stopTransaction Response (OK/OCMF)
+    Powermeter->>Powermeter: Mark need_to_stop_transaction to false
+end
+
+Note over Powermeter: In case of CommunicationError during start/stop<br> transaction please check the start/stop transaction diagrams
+```