web firmware update implemented

Arduino/CanGrow/include/CanGrow.h

@@ -44,8 +44,9 @@
 #define CANGROW_SSID "CanGrow-unconfigured"
 
 // do we need a restart? (e.g. after wifi settings change)
-bool needRestart;
+bool needRestart = false;
-bool doRestart;
+// this triggers Restart() from the main loop
+bool doRestart = false;
 // previous value of millis within the scheduler loop
 unsigned long schedulerPrevMillis = 0;
 

Arduino/CanGrow/include/CanGrow_Webserver.h

@@ -89,6 +89,10 @@ void Webserver_Init() {
   webserver.on("/wifi/", HTTP_POST, WebPage_wifi);
   webserver.on("/system/", HTTP_GET, WebPage_system);
   webserver.on("/system/", HTTP_POST, WebPage_system);
+  
+  webserver.on("/system/update", HTTP_GET, WebPage_system_update);
+  webserver.on("/system/update", HTTP_POST, WebPage_system_update, WebPage_system_update_ApplyUpdate);
+  
   webserver.on("/system/restart", HTTP_GET, WebPage_system_restart);
   webserver.on("/system/restart", HTTP_POST, WebPage_system_restart);
   

Arduino/CanGrow/include/Webserver/Page_system.h

@@ -49,7 +49,7 @@ void WebPage_system(AsyncWebServerRequest *request) {
 
 
 /*
- * Page subpage restart
+ * Subpage restart
  */
 String Proc_WebPage_system_restart(const String& var) {
   if(TestHeaderFooter(var)) {
@@ -84,3 +84,44 @@ void WebPage_system_restart(AsyncWebServerRequest *request) {
   }
   
 }
+
+
+
+/*
+ * Subpage update
+ */
+
+void WebPage_system_update_ApplyUpdate(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);
+      }
+    }
+  }
+
+void WebPage_system_update(AsyncWebServerRequest *request) {
+  if(request->method() == HTTP_POST) {
+    needRestart = !Update.hasError();
+    AsyncWebServerResponse *response = request->beginResponse(200, "text/plain", needRestart?"OK":"FAIL");
+    response->addHeader("Connection", "close");
+    request->send(response);
+  } else {
+    request->send_P(200, "text/html", Page_system_update_HTML, AddHeaderFooter);
+  }
+}
+
+

Arduino/CanGrow/include/Webserver/Page_system_HTML.h

@@ -74,6 +74,27 @@ ESP32-Cam IP (optional): <input type='text' name='Esp32CamIP' maxlength='16' val
 %FOOTER%)";
 
 
+/*
+ * Subpage update
+ */
+const char* Page_system_update_HTML PROGMEM = R"(%HEADER%
+<h2>&#x1F504; Firmware update</h2>
+Version: %CGVER% <br>
+Build  : %CGBUILD% <br>
+
+<p>You find the latest CanGrow firmware version on the <a href='https://git.la10cy.net/DeltaLima/CanGrow/releases' target='_blank'>release page</a> of the git repository.</p>
+<form method='POST' action='/system/update' enctype='multipart/form-data' onsubmit="document.getElementById('divUploading').style.display = '';">
+   <b>Select .bin file:</b><br>
+   <input type='file' accept='.bin,.bin.gz' name='firmware' required>
+   <input type='submit' value='Update Firmware'>
+</form>
+<div id='divUploading' style='display: none;' class='warnmsg'>&#x1F6DC; Uploading, please wait...<div>
+
+%FOOTER%)";
+
+/*
+ * Subpage restart
+ */
 const char* Page_system_restart_HTML PROGMEM = R"(%HEADER%
 <h1>&#10071; Restart CanGrow</h1>
 <div class='warnmsg'>