Added test api URL, configured static files caching

ESP32/data/www

@@ -0,0 +1 @@
+../../WebApp/www

ESP32/vehicle-monitor.cpp

@@ -30,7 +30,19 @@ void setup()
 	Serial.print("Wifi connected, ip=");
 	Serial.println(WiFi.localIP());
 
-	server.serveStatic("/", SPIFFS, "/www/").setDefaultFile("index.html");
+	server.on("/api/status", HTTP_GET, [](AsyncWebServerRequest *request){
+		int batteryVoltage = random(30000, 42000);
+		char json[128];
+		sprintf(json, "{\"v\":%d}", batteryVoltage);
+		request->send(200, "text/json", json);
+	});
+
+	// Special case to send index.html without caching
+	server.on("/", HTTP_GET, [](AsyncWebServerRequest *request){ request->send(SPIFFS, "/www/index.html", "text/html"); });
+	server.serveStatic("/index.html", SPIFFS, "/www/index.html");
+
+	// Other static files are cached (index.html knows whether to ignore caching or not for each file)
+	server.serveStatic("/", SPIFFS, "/www/").setCacheControl("max-age=5184000");
 
 	server.begin();
 	Serial.println("HTTP server started");