How to only get new data without existing data from a Firebase?

Question

I have a node in Firebase getting continually updated with information from a logfile. The node is lines/ and each child of lines/ is from a

Answer 1

I think there is a problem in @David East's solution. He is using the local timestamp which may cause problem if the time is not accurate in client device. Here is my suggested solution (iOS Swift):

• Using observeSingleEvent to get the complete data set
• Then returned it in reversed order by reversed()
• Get the last timestamp by for example data[0].timestamp

• Using queryStarting for timestamp

   self._dbref.queryOrdered(byChild: "timestamp").queryStarting(atValue: timestamp+1)
       .observe(.childAdded, with: {
          snapshot in
          print(snapshot.value)
    })