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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Collections;
using MQTTnet.Client;
using MQTTnet.Client.Options;
using MQTTnet;
using System.Reflection;
using MQTTnet.Client.Connecting;
using Tango.Core;
using MQTTnet.Packets;
namespace Tango.Telemetry.Destinations
{
public class TelemetryMqttDestination : ExtendedObject, ITelemetryDestination
{
private IMqttClient _mqttClient;
private IMqttClientOptions _mqttOptions;
private DateTime _nextRealAvailabilityCheck;
public string Name { get; set; } = "MQTT";
public String Address { get; private set; }
public int Port { get; private set; }
public String Topic { get; private set; }
public IReadOnlyList<TelemetrySourceTypes> SupportedSourceTypes { get; private set; }
/// <summary>
///
/// </summary>
/// <param name="topic">e.g machie/telemetry/serial number</param>
/// <param name="address">Default localhost</param>
/// <param name="port">Default 1883</param>
public TelemetryMqttDestination(String topic, String address = "localhost", int port = 1883)
{
_nextRealAvailabilityCheck = DateTime.Now;
Topic = topic;
Address = address;
Port = port;
SupportedSourceTypes = new List<TelemetrySourceTypes>() { TelemetrySourceTypes.Streaming };
}
public async Task<bool> IsAvailable()
{
if (_mqttClient == null)
{
return await EnsureConnection();
}
else
{
if (DateTime.Now > _nextRealAvailabilityCheck)
{
_nextRealAvailabilityCheck = DateTime.Now.AddMinutes(5);
return await EnsureConnection();
}
else
{
return _mqttClient.IsConnected;
}
}
}
private async Task<bool> EnsureConnection()
{
if (_mqttClient == null || !_mqttClient.IsConnected)
{
try
{
var factory = new MqttFactory();
_mqttClient = factory.CreateMqttClient();
String exeName = Assembly.GetEntryAssembly().GetName().Name;
_mqttOptions = new MqttClientOptionsBuilder()
.WithClientId(exeName)
.WithTcpServer(Address, Port)
.WithCleanSession()
.Build();
var result = await _mqttClient.ConnectAsync(_mqttOptions);
if (result.ResultCode != MqttClientConnectResultCode.Success)
{
LogManager.Log(new Exception($"Error connecting to MQTT broker. {result.ResultCode}"));
return false;
}
}
catch (Exception ex)
{
LogManager.Log(ex, "Error connecting to MQTT broker.");
return false;
}
}
return true;
}
public async Task Publish(TelemetryPublishPackage package, List<KeyValuePair<String, String>> properties)
{
if (await EnsureConnection())
{
var message = new MqttApplicationMessageBuilder()
.WithTopic($"{Topic}/{package.PendingTelemetry.TelemetryObject.ToTelemetryName()}")
.WithPayload(package.ToPayload())
.WithExactlyOnceQoS()
.WithRetainFlag(false)
.Build();
message.UserProperties = new List<MqttUserProperty>();
foreach (var prop in properties)
{
message.UserProperties.Add(new MqttUserProperty(prop.Key, prop.Value ?? String.Empty));
}
await _mqttClient.PublishAsync(message);
}
}
public void Dispose()
{
_mqttClient?.Dispose();
}
public override string ToString()
{
return $"{Name} -> {Address}:{Port}";
}
}
}
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