feat: enhance multi-container deployment support

Dockerfile

@@ -22,8 +22,14 @@ RUN cmake --build ./build -j 16 --target mo_simulator -j 16
 # Grant execute permissions to the shell script
 RUN chmod +x /MicroOcppSimulator/build/mo_simulator
 
-# Expose port 8000
-EXPOSE 8000
+# Copy pre-built frontend public folder for runtime API configuration
+COPY public /public
+
+# Copy entrypoint script for runtime environment setup
+COPY entrypoint.sh /entrypoint.sh
+RUN chmod +x /entrypoint.sh
 
-# Run the shell script inside the container
+ENTRYPOINT ["/entrypoint.sh"]
 CMD ["./build/mo_simulator"]
+
+EXPOSE 8000

build-webapp/build_webapp.ps1

@@ -1,40 +1,27 @@
-#build, compress the web-app and move the bundle file to the public folder
+# build_webapp.ps1
+# Build and compress frontend, do not handle API_ROOT
 
-#exit script on error
-$ErrorActionPreference = "Stop"
-#check relevant installs
-echo "[info] NodeJS and npm need to be installed to build the web-app"
+$ErrorActionPreference = 'Stop'
+Write-Host "[info] Installing dependencies and building frontend..."
 
-cd ./webapp-src
-
-#fetch most recent version
+Set-Location ./webapp-src
 git pull
 
-echo "Building web-app..."
-
-#check .env.production file exists
-$file = ".env.production"
-
-#If the file does not exist, create it.
-if (Test-Path -Path $file -PathType Leaf) {
-   echo "production environment found"
-}else{
-   echo "no .env.production file found"
-   cd ..
-   exit 1
-}
-
-
-#install dependencies
 npm install
-#build the webapp
 npm run build
-#compress the project
 npm run compress
 
-#move the compressed file into the public folder
-Move-Item ./dist/bundle.html.gz ../public/ -Force
+# Ensure bundle.html.gz exists
+if (-not (Test-Path "./dist/bundle.html.gz")) {
+  Write-Error "[error] Missing dist/bundle.html.gz, build failed"
+  exit 1
+}
 
-echo "[success] Up-to-date version of the web-app bundle was placed in the /public folder!"
+# Move compressed file to public
+if (-not (Test-Path "../public")) { 
+    New-Item -ItemType Directory -Path "../public" | Out-Null 
+}
+Move-Item "./dist/bundle.html.gz" "../public/" -Force
 
-cd ..
+Write-Host "[success] Frontend resources packaged and placed in public/ directory"
+Set-Location ..

entrypoint.sh

@@ -0,0 +1,21 @@
+#!/bin/sh
+set -e
+
+# Runtime API endpoint configuration
+TARGET_FILE="./public/bundle.html.gz"
+TEMP_HTML="/tmp/bundle.html"
+
+if [ -z "$API_ROOT" ]; then
+  echo "[warn] API_ROOT environment variable not detected, frontend will use {{API_ROOT}} placeholder"
+else
+  echo "[info] Runtime replacement: {{API_ROOT}} → $API_ROOT"
+  # Decompress to temporary file
+  gzip -d -c "$TARGET_FILE" > "$TEMP_HTML"
+  # Replace all placeholders
+  sed -i "s|{{API_ROOT}}|$API_ROOT|g" "$TEMP_HTML"
+  # Recompress back to original path
+  gzip -9 -c "$TEMP_HTML" > "$TARGET_FILE"
+fi
+
+# Start the C++ simulator
+exec "./build/mo_simulator"

src/main.cpp

@@ -101,10 +101,20 @@ void load_ocpp_version(std::shared_ptr<MicroOcpp::FilesystemAdapter> filesystem)
 }
 
 void app_setup(MicroOcpp::Connection& connection, std::shared_ptr<MicroOcpp::FilesystemAdapter> filesystem) {
+    // Configure charger credentials from environment variables or use defaults
+    const char *envId = std::getenv("CHARGER_ID");
+    const char *envKey = std::getenv("CHARGER_KEY");
+    std::string chargerId = envId ? envId : "MicroOcpp Simulator";
+    std::string chargerKey = envKey ? envKey : "MicroOcpp";
+
+    // Log runtime configuration values for debugging
+    std::cout << "[INFO] Charger ID: " << chargerId << std::endl;
+    std::cout << "[INFO] Charger Key: " << chargerKey << std::endl;
+
     mocpp_initialize(connection,
             g_isOcpp201 ?
-                ChargerCredentials::v201("MicroOcpp Simulator", "MicroOcpp") :
-                ChargerCredentials("MicroOcpp Simulator", "MicroOcpp"),
+                ChargerCredentials::v201(chargerId.c_str(), chargerKey.c_str()) :
+                ChargerCredentials(chargerId.c_str(), chargerKey.c_str()),
             filesystem,
             false,
             g_isOcpp201 ?