add dev mode support

rust/src_webpack/webpack.config.js

@@ -1,10 +1,37 @@
- 
+const webpack = require('webpack');
+const CopyPlugin = require("copy-webpack-plugin");
 const path = require('path');
 
+const isDevServer = process.env.WEBPACK_SERVE;
+console.log("Dev server is " + isDevServer);
+var host;
+if (isDevServer){
+  host = 'http://10.23.43.24';
+} else {
+  host = '';
+}
+
 module.exports = {
   mode: "development",
   entry: ['./src/form.ts','./src/ota.ts', "./src/battery.ts"],
   devtool: 'inline-source-map',
+  plugins: [
+    new CopyPlugin({
+      patterns: [
+        {
+          from: "src/index.html",
+          to: "index.html"
+        }
+      ]
+    }),
+    new webpack.DefinePlugin({
+      PUBLIC_URL: JSON.stringify(host),
+    }),
+    new webpack.EnvironmentPlugin({
+      redirect: 'true'
+    })
+    
+  ],
   module: {
     rules: [
       {
@@ -21,4 +48,6 @@ module.exports = {
     filename: 'bundle.js',
     path: path.resolve(__dirname, '../src/webserver'),
   },
+  devServer: {
+  }
 };