/// <summary>
/// This method initiates the reverse connection setup.
/// It creates a new message and sends it via relay to the unreachable peer
/// which then connects to this peer again. After the connect message from the
/// unreachable peer, this peer will send the original message and its content
/// directly.
/// </summary>
/// <param name="handler"></param>
/// <param name="tcsResponse"></param>
/// <param name="message"></param>
/// <param name="channelCreator"></param>
/// <param name="connectTimeoutMillis"></param>
/// <param name="peerConnection"></param>
/// <param name="timeoutHandler"></param>
private async Task HandleRconAsync(IInboundHandler handler, TaskCompletionSource <Message.Message> tcsResponse,
Message.Message message, ChannelCreator channelCreator, int connectTimeoutMillis,
PeerConnection peerConnection, TimeoutFactory timeoutHandler)
{
message.SetKeepAlive(true);
Logger.Debug("Initiate reverse connection setup to peer with address {0}.", message.Recipient);
var rconMessage = CreateRconMessage(message);
// TODO works?
// cache the original message until the connection is established
_cachedRequests.AddOrUpdate(message.MessageId, tcsResponse, (i, source) => tcsResponse);
// wait for response (whether the reverse connection setup was successful)
var tcsRconResponse = new TaskCompletionSource <Message.Message>(rconMessage);
// .NET-specific: specify and use a RconInboundHandler class
var rconInboundHandler = new RconInboundHandler(tcsRconResponse, tcsResponse);
// send reverse connection request instead of normal message
await SendTcpAsync(rconInboundHandler, tcsRconResponse, rconMessage, channelCreator, connectTimeoutMillis,
connectTimeoutMillis, peerConnection);
}