Add upload firmware helper to server

Author: nseidle

Firmware/RTK_Surveyor/AP-Config/src/main.js

@@ -357,6 +357,10 @@ function exitConfig() {
     ws.send("exitToRoverMode,1,");
 }
 
+function firmwareUploadWait() {
+    ge("firmwareUploadMsg").innerHTML = "<br>Uploading, please wait....";
+}
+
 document.addEventListener("DOMContentLoaded", (event) => {
 
     ge("measurementRateHz").addEventListener("change", function () {

Firmware/RTK_Surveyor/Form.ino

@@ -125,6 +125,11 @@ void startConfigAP()
     request->send(response);
   });
 
+  //Handler for the /update form POST
+  server.on("/upload", HTTP_POST, [](AsyncWebServerRequest *request){
+      request->send(200);
+    }, handleFirmwareFileUpload);
+
   server.begin();
 #endif