Add volume control to bottom panel

Changes:
- Import a reworked version of the KUKSA.val client code from the
  Flutter dashboard app, with the aggregated signal Riverpod provider
  replaced with per-signal providers for the signal the homescreen
  needs and a couple of temperature ones it might use.  Using separate
  providers is more in-line with recommended Riverpod best practices.
- Various tweaks to enable using Riverpod.
- Split the bottom panel out into its own widget, and add a stack in
  it to layer the default logo panel with the volume control slider,
  which has been added as a new widget definition to provide the hook
  to drive timer based lowering behavior like the Qt homescreen does.
- The KUKSA.val connection widget has been added to the bottom panel
  rather than overriding the top-level widget as in the dashboard and
  HVAC apps.  This seems preferable with respect to still providing
  some functionality in the event KUKSA.val is unavailable.
- Remove the old demo dashboard and HVAC pages that are now unused,
  along with the image assets they needed, to allow cleaning up
  pubspec.yaml and ease maintenance.

Bug-AGL: SPEC-4659

Signed-off-by: Scott Murray <scott.murray@konsulko.com>
Change-Id: I5d9180a3461948a58321564e71134c4961ce0ef7

1 files changed, 29 insertions, 0 deletions

diff --git a/lib/vehicle-signals/viss_config.dart b/lib/vehicle-signals/viss_config.dart
new file mode 100644
index 0000000..c2be5ee
--- /dev/null
+++ b/lib/vehicle-signals/viss_config.dart
@@ -0,0 +1,29 @@
+// SPDX-License-Identifier: Apache-2.0
+//import 'dart:convert';
+import 'dart:io';
+
+import 'package:flutter_homescreen/config.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+//import 'package:http/http.dart' as http;
+
+final sockConnectprovider = FutureProvider.family<WebSocket, HttpClient>(
+    (ref, client) => connect(client, ref));
+
+Future<HttpClient> initializeClient() async {
+  SecurityContext ctx = SecurityContext.defaultContext;
+
+  HttpClient client = HttpClient(context: ctx)
+    ..findProxy = null
+    ..badCertificateCallback = (cert, host, port) {
+      return true;
+    };
+  return client;
+}
+
+Future<WebSocket> connect(HttpClient client, ref) async {
+  final config = ref.read(ConfigStateprovider);
+  WebSocket socket = await WebSocket.connect(
+      "wss://${config.hostname}:${config.port}",
+      customClient: client);
+  return socket;
+}