public async Task Loose_Connection()
{
using (var testEnvironment = new TestEnvironment(TestContext))
{
testEnvironment.ServerPort = 8364;
var server = await testEnvironment.StartServerAsync();
var client = await testEnvironment.ConnectLowLevelClientAsync(o => o.WithCommunicationTimeout(TimeSpan.Zero));
await Authenticate(client).ConfigureAwait(false);
await server.StopAsync();
await Task.Delay(1000);
try
{
await client.SendAsync(MqttPingReqPacket.Instance, CancellationToken.None).ConfigureAwait(false);
await client.SendAsync(MqttPingReqPacket.Instance, CancellationToken.None).ConfigureAwait(false);
}
catch (MqttCommunicationException exception)
{
Assert.IsTrue(exception.InnerException is SocketException);
return;
}
catch
{
Assert.Fail("Wrong exception type thrown.");
}
Assert.Fail("This MUST fail");
}
}
public async Task Disconnect_Client_DueTo_KeepAlive()
{
using (var testEnvironment = new TestEnvironment())
{
await testEnvironment.StartServerAsync();
var client = await testEnvironment.ConnectLowLevelClientAsync(o => o
.WithCommunicationTimeout(TimeSpan.FromSeconds(1))
.WithCommunicationTimeout(TimeSpan.Zero)
.WithProtocolVersion(MqttProtocolVersion.V500)).ConfigureAwait(false);
await client.SendAsync(new MqttConnectPacket
{
CleanSession = true,
ClientId = "abc",
KeepAlivePeriod = 1
}, CancellationToken.None).ConfigureAwait(false);
var responsePacket = await client.ReceiveAsync(CancellationToken.None).ConfigureAwait(false);
Assert.IsTrue(responsePacket is MqttConnAckPacket);
for (var i = 0; i < 6; i++)
{
await Task.Delay(500);
await client.SendAsync(MqttPingReqPacket.Instance, CancellationToken.None);
responsePacket = await client.ReceiveAsync(CancellationToken.None);
Assert.IsTrue(responsePacket is MqttPingRespPacket);
}
// If we reach this point everything works as expected (server did not close the connection
// due to proper ping messages.
// Now we will wait 1.1 seconds because the server MUST wait 1.5 seconds in total (See spec).
await Task.Delay(1100);
await client.SendAsync(MqttPingReqPacket.Instance, CancellationToken.None);
responsePacket = await client.ReceiveAsync(CancellationToken.None);
Assert.IsTrue(responsePacket is MqttPingRespPacket);
// Now we will wait longer than 1.5 so that the server will close the connection.
responsePacket = await client.ReceiveAsync(CancellationToken.None);
var disconnectPacket = responsePacket as MqttDisconnectPacket;
Assert.IsTrue(disconnectPacket != null);
Assert.AreEqual(disconnectPacket.ReasonCode, MqttDisconnectReasonCode.KeepAliveTimeout);
}
}
