fix: Show reboot request response in UI

Also make response from api more understandable for non-technical users.

Signed-off-by: Matthias Blankertz <matthias@blankertz.org>

software/frontend/index.html

@@ -154,7 +154,7 @@
         <!-- More screens can be added later -->
     </ul>
     <hr>
-    <button onclick="fetch('/api/v1/reboot/bootloader', {'method': 'POST'});">Reboot to bootloader</button>
+    <button onclick="requestReboot()">Reboot to bootloader</button>
 </div>
 
 <!-- CONFIG EDITOR SCREEN -->
@@ -966,6 +966,14 @@
         
         return { init, onShow };
     })();
+
+// Misc
+    async function requestReboot() {
+        const resp = await fetch('/api/v1/reboot/bootloader', {'method': 'POST'});
+        if (!resp.ok) {
+            alert('Reboot to bootloader failed: ' + await resp.text());
+        }
+    }
     
 // Initialization
     Object.values(Screens).forEach(screen => {

software/src/app.py

@@ -196,8 +196,5 @@ class PlayerApp:
     def get_playlist_db(self):
         return self.playlist_db
 
-    def get_timer_manager(self):
-        return self.timer_manager
-
     def get_leds(self):
         return self.leds

software/src/webserver.py

@@ -4,6 +4,7 @@ Copyright (c) 2024-2025 Stefan Kratochwil <Kratochwil-LA@gmx.de>
 '''
 
 import asyncio
+import hwconfig
 import json
 import machine
 import os
@@ -33,7 +34,7 @@ def start_webserver(config_, app_):
     nfc = app.get_nfc()
     playlist_db = app.get_playlist_db()
     leds = app.get_leds()
-    timer_manager = app.get_timer_manager()
+    timer_manager = TimerManager()
 
 
 @webapp.before_request
@@ -257,6 +258,9 @@ async def audiofile_delete(request):
 
 @webapp.route('/api/v1/reboot/<method>', methods=['POST'])
 async def reboot(request, method):
+    if hwconfig.get_on_battery():
+        return 'not allowed: usb not connected', 403
+
     if method == 'bootloader':
         leds.set_state(LedManager.REBOOTING)
         timer_manager.schedule(time.ticks_ms() + 1500, machine.bootloader)