device: upgrade messages when no supported device found

lib/solaar/cli/__init__.py

@@ -203,7 +203,9 @@ def run(cli_args=None, hidraw_path=None):
         else:
             c = list(_receivers(hidraw_path))
         if not c:
-            raise Exception('No devices found')
+            raise Exception(
+                'No supported device found.  Use "lsusb" and "bluetoothctl devices Connected" to list connected devices.'
+            )
         from importlib import import_module
         m = import_module('.' + action, package=__name__)
         m.run(c, args, _find_receiver, _find_device)

lib/solaar/ui/tray.py

@@ -55,7 +55,7 @@ def _create_menu(quit_handler):
 
     # per-device menu entries will be generated as-needed
 
-    no_receiver = Gtk.MenuItem.new_with_label(_('No Logitech device found'))
+    no_receiver = Gtk.MenuItem.new_with_label(_('No supported device found'))
     no_receiver.set_sensitive(False)
     menu.append(no_receiver)
     menu.append(Gtk.SeparatorMenuItem.new())