title: Signalr client to retrieve missed messages on reconnect
body: <p>I would like a user to retrieve messages that they may have missed when they re-connect to the Signalr server. </p>
  
  <p>I know I could persist the messages independently of Signalr, keep track of the last message id received in the client and resend the newer messages on reconnect but I was looking at the SqlServer backplane's Messages_0 table which has a Payload and PayloadID and was wondering if there is a more Signalr'y way to get the backplane to do this for me or to extend the backplane to do this for me.</p>
  
  <p>Do you any ideas how I might go about this? </p>