feat: add FUSION_CHARGER_MOCK_PORT configuration option for Modbus TCP port (EVerest#1907)

* feat: add FUSION_CHARGER_MOCK_PORT configuration option for Modbus TCP port

Signed-off-by: Manuel Janocha <manuel.janocha@heidelberg.com>

* Update modules/HardwareDrivers/PowerSupplies/Huawei_V100R023C10/docs/index.rst

Co-authored-by: Piet Gömpel <37657534+Pietfried@users.noreply.github.com>
Signed-off-by: ManuelJanocha <73517886+ManuelJanocha@users.noreply.github.com>

---------

Signed-off-by: Manuel Janocha <manuel.janocha@heidelberg.com>
Signed-off-by: ManuelJanocha <73517886+ManuelJanocha@users.noreply.github.com>
Co-authored-by: Piet Gömpel <37657534+Pietfried@users.noreply.github.com>

Author: ManuelJanocha

modules/HardwareDrivers/PowerSupplies/Huawei_V100R023C10/docs/index.rst

@@ -155,6 +155,14 @@ The mock has a few environment variables (enable or disable by setting them to `
   messages. This also allows to receive completely unsigned messages.
 - ``FUSION_CHARGER_MOCK_ETH``: The ethernet interface to use for receiving and sending goose messages. Defaults to
   ``veth0``.
+- ``FUSION_CHARGER_MOCK_PORT``: The Modbus TCP port to listen on. Defaults to ``8502``.
+- ``FUSION_CHARGER_MOCK_MQTT_HOST``: MQTT broker hostname or IP address. When set together with 
+  ``FUSION_CHARGER_MOCK_MQTT_PORT``, the mock will publish power request data via MQTT.
+- ``FUSION_CHARGER_MOCK_MQTT_PORT``: MQTT broker port. Required together with ``FUSION_CHARGER_MOCK_MQTT_HOST`` to 
+  enable MQTT publishing.
+- ``FUSION_CHARGER_MOCK_MQTT_BASE_TOPIC``: Base topic for MQTT publishing. Defaults to ``fusion_charger_mock/``. 
+  Power requests are published to ``<base_topic>/<connector_number>/power_request`` with JSON payload containing 
+  voltage and current values.
 
 It also has one optional command line argument, being the path to a folder with certificates and keys for mTLS.
 
@@ -172,4 +180,10 @@ corresponding files for the dispenser):
 
 .. code-block:: bash
 
-    modules/HardwareDrivers/PowerSupplies/Huawei_V100R023C10/fusion_charger_lib/fusion-charger-dispenser-library/user-acceptance-tests/test_certificates/generate.sh
+    modules/HardwareDrivers/PowerSupplies/Huawei_V100R023C10/fusion_charger_lib/fusion-charger-dispenser-library/user-acceptance-tests/test_certificates/generate.sh
+
+Then run the mock with the path to the certificates folder:
+
+.. code-block:: bash
+
+    ./fusion_charger_mock /path/to/certificates

modules/HardwareDrivers/PowerSupplies/Huawei_V100R023C10/fusion_charger_lib/fusion-charger-dispenser-library/power_stack_mock/src/main.cpp

@@ -308,6 +308,11 @@ int main(int argc, char* argv[]) {
         printf("Using default Ethernet interface: %s\n", config.eth.c_str());
     }
 
+    // Set the Modbus TCP port to use
+    if (std::getenv("FUSION_CHARGER_MOCK_PORT")) {
+        config.port = std::atoi(std::getenv("FUSION_CHARGER_MOCK_PORT"));
+    }
+
     printf("Waiting for connections on port %d\n", config.port);
 
     std::shared_ptr<MqttPowerRequestPublisher> mqtt_publisher;