ping method
Returns a message if the API is up and running.
Implementation
Future<(HaMessage?, HaFailure?)> ping() async {
const endpoint = '/api/';
final response = await sl.get<HttpClient>().get(url + endpoint, _headers);
return response.success
? (HaMessage.fromJson(jsonDecode(response.dataStr)), null)
: (null, HaFailure(message: response.dataStr));
}