private void DisplayAlarm(string level, string alarmMessage)
{
Debug.WriteLine($"\n{alarmMessage}\n");
MqttMessageTransport mmt = new MqttMessageTransport();
// string now = string.Format("{0:HH:mm:ss tt}", DateTime.Now);
mmt.Topic = level;
mmt.Message = $"{string.Format("{0:HH:mm:ss tt}", DateTime.Now)}; {alarmMessage}";
_eventAggregator.GetEvent <MqttMessageTransport>().Publish(mmt);
}
private void _client_MqttMsgPublishReceived(object sender, MqttMsgPublishEventArgs e)
{
var message = System.Text.Encoding.Default.GetString(e.Message);
MqttMessageTransport mmt = new MqttMessageTransport();
mmt.Topic = e.Topic;
mmt.Message = message;
Debug.WriteLine($"Message received in MqttDataService _client_MqttMsgPublishReceived {message}");
_eventAggregator.GetEvent <MqttMessageTransport>().Publish(mmt);
}
// TODO: Why would I use either DelegateCommand or ICommand over the other ???
//private DelegateCommand _publishFritzMessageCommand;
//public DelegateCommand PublishFritzMessageCommand =>
// _publishFritzMessageCommand ?? (_publishFritzMessageCommand = new DelegateCommand(ExecutePublishFritzMessageCommand));
private void MqttMessageTransportMessageReceived(MqttMessageTransport obj)
{
MqttMessageTransportMessages.Add(obj);
Debug.WriteLine($"MqttMessageTransport message received in MqttViewViewModel: Topic: '{obj.Topic}' Message: '{obj.Message}");
}
public async Task Initialize()
{
Debug.WriteLine($"\n\n in MqttDataService Initialize() \n\n");
DisplayAlarm("Info", "Mqtt chat starting");
string clientId = "";
switch (Device.RuntimePlatform)
{
case Device.UWP:
clientId = "XamarinChatAppUWP";
break;
case Device.Android:
clientId = "XamarinChatAppAndroid";
break;
default:
clientId = "XamarinChatAppiOS";
break;
}
try
{
var factory = new MqttFactory();
_client = factory.CreateMqttClient();
if (_xpdSetting.UseTls)
{
_options = new MqttClientOptionsBuilder()
.WithClientId(clientId)
.WithTcpServer(_xpdSetting.MqttBrokerAddress, Int16.Parse(_xpdSetting.MqttBrokerTlsPort)) // old M2MqttDotNet used string port.
.WithCredentials(_xpdSetting.MqttBrokerUserName, _xpdSetting.MqttBrokerUserPassword)
.WithCleanSession()
.WithTls()
.Build();
}
else
{
_options = new MqttClientOptionsBuilder()
.WithClientId(clientId)
.WithTcpServer(_xpdSetting.MqttBrokerAddress, Int16.Parse(_xpdSetting.MqttBrokerPort))
.WithCredentials(_xpdSetting.MqttBrokerUserName, _xpdSetting.MqttBrokerUserPassword)
.WithCleanSession()
.Build();
}
_client.ConnectAsync(_options).Wait();
_client.SubscribeAsync(new MqttTopicFilterBuilder().WithTopic(_xpdSetting.MqttBrokerTopic).Build()).Wait();
}
catch (Exception e)
{
Debug.WriteLine(e);
}
_client.UseConnectedHandler(e =>
{
Debug.WriteLine("Connected successfully with MQTT Brokers.");
_client.SubscribeAsync(new MqttTopicFilterBuilder().WithTopic(_xpdSetting.MqttBrokerTopic).Build()).Wait();
});
_client.UseDisconnectedHandler(async e =>
{
Debug.WriteLine("\nDisconnect\n");
await Task.Delay(TimeSpan.FromSeconds(5));
try
{
await _client.ConnectAsync(_options, CancellationToken.None); // Since 3.0.5 with CancellationToken
Debug.WriteLine("### Reconnection Success! ###");
_client.SubscribeAsync(new MqttTopicFilterBuilder().WithTopic(_xpdSetting.MqttBrokerTopic).Build()).Wait();
}
catch
{
Debug.WriteLine("### RECONNECTING FAILED ###");
}
});
_client.UseApplicationMessageReceivedHandler(e =>
{
MqttMessageTransport mmt = new MqttMessageTransport
{
Topic = e.ApplicationMessage.Topic,
Message = Encoding.UTF8.GetString(e.ApplicationMessage.Payload)
};
Debug.WriteLine($"Message received in MqttDataService _client_MqttMsgPublishReceived {mmt.Message}");
_eventAggregator.GetEvent <MqttMessageTransport>().Publish(mmt);
});
}
