public async Task ConnectMqttServerAsync()
{
// var logger = _loggerFactory.CreateLogger("MqttHelper");
IMqttClientOptions MqttOptions()
{
var options = new MqttClientOptionsBuilder()
.WithClientId(_option.ClientID)
.WithTcpServer(_option.HostIp, _option.HostPort)
.WithCredentials(_option.UserName, _option.Password)
//.WithTls()//服务器端没有启用加密协议，这里用tls的会提示协议异常
.WithCleanSession()
.Build();
return(options);
}
// Create a new Mqtt client.
try
{
if (MqttClient == null)
{
MqttClient = new MqttFactory().CreateMqttClient();
// 接收到消息回调
MqttClient.ApplicationMessageReceivedHandler = new MqttApplicationMessageReceivedHandlerDelegate(e =>
{
var received = new MqttMessageReceived
{
Topic = e.ApplicationMessage.Topic,
Payload = Encoding.UTF8.GetString(e.ApplicationMessage.Payload),
QoS = e.ApplicationMessage.QualityOfServiceLevel,
Retain = e.ApplicationMessage.Retain
};
#if DEBUG
//const string path = "E:\\MQTTPayload.txt";
//await Tools.WriteTxt(path, received.Payload);
#endif
var messageQueue = new SenparcMessageQueue();
var key = SenparcMessageQueue.GenerateKey("MessageHandlerSendMessageAsync", MqttClient.GetType(), Guid.NewGuid().ToString(), "MqttClient.ApplicationMessageReceivedHandler");
messageQueue.Add(key, async() =>
{
_logger.LogWarning("MqttReceivedMsg:\r\n" + received.Payload);
await _schoolBusBusines.MqttMessageReceivedAsync(received);
});
//Console.WriteLine($">> ### 接受消息 ###{Environment.NewLine}");
//Console.WriteLine($">> Topic = {received.Topic}{Environment.NewLine}");
//Console.WriteLine($">> Payload = {received.Payload}{Environment.NewLine}");
//Console.WriteLine($">> QoS = {received.QoS}{Environment.NewLine}");
//Console.WriteLine($">> Retain = {received.Retain}{Environment.NewLine}");
});
// 连接成功回调
MqttClient.ConnectedHandler = new MqttClientConnectedHandlerDelegate(async e =>
{
Console.WriteLine("已连接到MQTT服务器！" + Environment.NewLine);
await Subscribe(MqttClient, _option.MqttTopic);
});
// 断开连接回调
MqttClient.DisconnectedHandler = new MqttClientDisconnectedHandlerDelegate(async e =>
{
var curTime = DateTime.UtcNow;
Console.WriteLine($">> [{curTime.ToLongTimeString()}]");
Console.WriteLine("已断开MQTT连接！" + Environment.NewLine);
//Reconnecting 重连
if (IsReconnect && !e.ClientWasConnected)
{
Console.WriteLine("正在尝试重新连接" + Environment.NewLine);
await Task.Delay(TimeSpan.FromSeconds(5));
try
{
await MqttClient.ConnectAsync(MqttOptions());
}
catch
{
Console.WriteLine("### 重新连接 失败 ###" + Environment.NewLine);
}
}
else
{
Console.WriteLine("已下线！" + Environment.NewLine);
}
});
try
{
await MqttClient.ConnectAsync(MqttOptions());
}
catch (Exception ex)
{
Console.WriteLine("连接到MQTT服务器失败！" + Environment.NewLine + ex.Message + Environment.NewLine);
}
}
}
catch (Exception e)
{
Console.WriteLine("连接到MQTT服务器未知异常！" + Environment.NewLine + e.Message + Environment.NewLine);
}
}