Update README.md

Add example web updater

README.md

@@ -789,6 +789,9 @@ const char* password = "your-pass";
 const char* http_username = "admin";
 const char* http_password = "admin";
 
+//flag to use from web update to reboot the ESP
+bool shouldReboot = false;
+
 void onRequest(AsyncWebServerRequest *request){
   //Handle Unknown Request
   request->send(404);
@@ -830,7 +833,7 @@ void setup(){
   // upload a file to /upload
   server.on("/upload", HTTP_POST, [](AsyncWebServerRequest *request){
     request->send(200);
-  }, handleUpload);
+  }, onUpload);
 
   // send a file when /index is requested
   server.on("/index", HTTP_ANY, [](AsyncWebServerRequest *request){
@@ -843,6 +846,37 @@ void setup(){
         return request->requestAuthentication();
     request->send(200, "text/plain", "Login Success!");
   });
+  
+  // Simple Firmware Update Form
+  server.on("/update", HTTP_GET, [](AsyncWebServerRequest *request){
+    request->send(200, "text/html", "<form method='POST' action='/update' enctype='multipart/form-data'><input type='file' name='update'><input type='submit' value='Update'></form>");
+  });
+  server.on("/update", HTTP_POST, [](AsyncWebServerRequest *request){
+    shouldReboot = !Update.hasError();
+    AsyncWebServerResponse *response = request->beginResponse(200, "text/plain", shouldReboot?"OK":"FAIL");
+    response->addHeader("Connection", "close");
+    request->send(response);
+  },[](AsyncWebServerRequest *request, String filename, size_t index, uint8_t *data, size_t len, bool final){
+    if(!index){
+      Serial.printf("Update Start: %s\n", filename.c_str());
+      Update.runAsync(true);
+      if(!Update.begin((ESP.getFreeSketchSpace() - 0x1000) & 0xFFFFF000)){
+        Update.printError(Serial);
+      }
+    }
+    if(!Update.hasError()){
+      if(Update.write(data, len) != len){
+        Update.printError(Serial);
+      }
+    }
+    if(final){
+      if(Update.end(true)){
+        Serial.printf("Update Success: %uB\n", index+len);
+      } else {
+        Update.printError(Serial);
+      }
+    }
+  });
 
   // attach filesystem root at URL /fs
   server.serveStatic("/fs", SPIFFS, "/");
@@ -858,6 +892,10 @@ void setup(){
 }
 
 void loop(){
+  if(shouldReboot){
+    Serial.println("Rebooting...");
+    ESP.restart();
+  }
   static char temp[128];
   sprintf(temp, "Seconds since boot: %u", millis()/1000);
   events.send(temp, "time"); //send event "time"