CONNECT packet must have at least 7 bytes.

### Describe your question

testapi.suzhoujiding.com host => localhost

PacketFormatterAdapter.TryDecode

if (formatter.ProtocolVersion == MqttProtocolVersion.Unknown)
{
formatter.DetectProtocolVersion(receivedMqttPacket);
}

public void DetectProtocolVersion(ReceivedMqttPacket receivedMqttPacket)
{
var protocolVersion = ParseProtocolVersion(receivedMqttPacket);
UseProtocolVersion(protocolVersion);
}