start a web server on port 80, serving static HTML from SPIFFS

wiflash_esp32/wiflash_esp32.ino

@@ -28,8 +28,10 @@
 
 #include <Arduino.h>
 #include <WiFi.h>
+#include <SPIFFS.h>
 #include <ArduinoOSC.h>
 #include <NeoPixelBus.h>
+#include <ESPAsyncWebServer.h>
 #include <Preferences.h>
 #include "sacn.h"
 #include "strobe_esp32.h"
@@ -81,6 +83,7 @@ struct config_ config;
 Strobe *strobe;
 NeoPixelBus<NeoGrbwFeature, Neo800KbpsMethod> *strip;
 ESPAsyncE131 *e131 = new ESPAsyncE131();
+AsyncWebServer server(80);
 Preferences prefs;
 
 //// static hardware
@@ -161,6 +164,18 @@ bool loadConfig() {
 
   return true;
 }
+
+/*
+   Start the async web server
+*/
+void startHTTPD() {
+  server.serveStatic("/", SPIFFS, "/www/").setDefaultFile("index.html");
+
+  server.onNotFound([](AsyncWebServerRequest * request) {
+    request->send(404, "text/plain", "Not found");
+  });
+
+  server.begin();
 }
 
 
@@ -204,6 +219,12 @@ void setup() {
   Serial.println("Disabling Bluetooth.");
   btStop();
 
+  Serial.println("Mounting SPI Flash FS.");
+  SPIFFS.begin();
+
+  Serial.println("Starting HTTP interface.");
+  startHTTPD();
+
 
   //// start fixtures hardware:
   // battery monitor