private async Task <ConnectReturnCode> AuthenticateAsync(ReadListeningHandler readListener)
{
var connectPacket = new ConnectPacket
{
ClientId = ClientId,
CleanSession = true
};
//if (!string.IsNullOrEmpty(username))
//{
// packet.UsernameFlag = true;
// packet.UserName = username;
//}
//if (!string.IsNullOrEmpty(password))
//{
// packet.PasswordFlag = true;
// packet.Password = password;
//}
//connectPacket.KeepAlive = KeepAlive;
await _clientChannel.WriteAndFlushAsync(connectPacket);
if (await readListener.ReceiveAsync() is ConnAckPacket connAckPacket)
{
return(connAckPacket.ConnectReturnCode);
}
return(ConnectReturnCode.UnacceptedProtocolVersion);
}
/// <summary>
/// 连接
/// </summary>
/// <param name="username">用户名</param>
/// <param name="password">密码</param>
/// <returns></returns>
public async Task <ConnectReturnCode> ConnectAsync(string username = default, string password = default)
{
var clientReadListener = new ReadListeningHandler();
var bootstrap = new Bootstrap();
bootstrap
.Group(_group)
.Channel <TcpSocketChannel>()
.Option(ChannelOption.TcpNodelay, true)
.Handler(new ActionChannelInitializer <ISocketChannel>(channel =>
{
var pipeline = channel.Pipeline;
pipeline.AddLast(MqttEncoder.Instance, new MqttDecoder(false, 256 * 0124), clientReadListener);
}));
try
{
_clientChannel = await bootstrap.ConnectAsync(new IPEndPoint(IPAddress.Parse("118.126.96.166"), 1883)).ConfigureAwait(false);
var connectResponse = await AuthenticateAsync(clientReadListener).ConfigureAwait(false);;
if (connectResponse == ConnectReturnCode.ConnectionAccepted)
{
StartReceivingPackets(clientReadListener);
}
OnConnected?.Invoke(connectResponse);
return(connectResponse);
}
catch
{
await DisconnectAsync();
throw new Exception("BrokerUnavailable");
}
}
private async Task ReceivePacketsAsync(ReadListeningHandler clientReadListener)
{
while (true)
{
if (await clientReadListener.ReceiveAsync() is Packet packet)
{
await ProcessReceivedPacketAsync(packet);
}
}
}
private void StartReceivingPackets(ReadListeningHandler clientReadListener)
{
Task.Run(() => ReceivePacketsAsync(clientReadListener));
}
