How to get latency / ping time?

[NirmitDagly]

Kudos to the development team for this excellent work. It is really helpful and easy to implement.

I have gone through the code and can measure the download and upload speed accurately within the application. Now, beforehand I start the speed test, I would like to check the latency time as well.

So is that possible in any way with the current version of the library?

Regards,
Nirmit

[stephen-soltesz]

Hello, @NirmitDagly I am not an ios developer, so I can't speak to all functionality available from this client. I can speak about the information provided by the NDT server during a test.

For both upload and download tests, the server sends periodic connection measurements that include (among other information) a TCPInfo structure, example here:

ndt7-client-ios/Tests/NDT7MeasurementTests.swift

Lines 35 to 47 in f80494f

	"TCPInfo": {
	"BusyTime": 1234,
	"BytesAcked": 12345,
	"BytesReceived": 12346,
	"BytesSent": 12347,
	"BytesRetrans": 12348,
	"ElapsedTime": 12349,
	"MinRTT": 12340,
	"RTT": 123411,
	"RTTVar": 123412,
	"RWndLimited": 123413,
	"SndBufLimited": 123414
	}

The MinRTT value will represent the best case latency between the client and server during the life of the connection. The RTT value will change over the life of the connection and reflect the latency due to other load on the network (caused by other traffic or the speed test itself).

Most client implementations provide a way to receive these measurement messages. If this ios client does not yet, that would be a welcome feature.