Networking Stats - Socket Data Usage (sent/received data amount)

RE: Networking Stats - Socket Data Usage (sent/received data amount)

Achim Kraus — Tue, 29 Oct 2024 05:57:01 GMT

I'm not an employee of Nordic, but for me the reason is pretty clear:

"AT%XCONNSTAT?" does a good job.

If you use MQTT you will have some unaware data consumption (TCP connect/TCP ACK) and if you use TLS, each connect will come with an handshake (several k bytes). So the experience is pretty clear and simple: let it run for a week and see how much data-volume that requires in the "wild" outside your laboratory. Especially in cases with low radio signals you will need some extra data for TCP/TLS.

For UDP it's up to you (and the use-case), if a missing message should "restart the connection" or simply "try it later again" works. Using CoAP/DTLS 1.2 CID requires for IP/UDP/DTLS 1.2 CID/CoAP an average overhead of about 100 bytes per message (rare DTLS handshakes included). If you use IP/TCP/TLS 1.2 the overhead per message will be slightly smaller (you mainly save the CID), but the average the depends pretty much from the number of required connect/TLS handshakes. Therefore, only a test in the "wild" will give you realistic results.

RE: Networking Stats - Socket Data Usage (sent/received data amount)

AdrianT — Tue, 29 Oct 2024 03:37:06 GMT

Encountering the same issue (NRF9161), when trying to check data usage for MQTT communications. Any chance that support can provide a reason why this doesn't work?

RE: Networking Stats - Socket Data Usage (sent/received data amount)

Achim Kraus — Thu, 03 Oct 2024 07:22:15 GMT

> I am interested in bytes.

Send 1024 messages and you will see the bytes ;-).

To be frank, with all the things happening "unexpected" (e.g. TCP internal retransmissions or retransmission from upper UDP protocols), counting bytes won't reflect the real data consumption in the wild. There you need to run the device for a couple of days and the k-bytes will be a pretty well value reflecting the reality.

RE: Networking Stats - Socket Data Usage (sent/received data amount)

Povilas S — Thu, 03 Oct 2024 06:57:15 GMT

I've seen that one, but it is kilobytes and for this case I am interested in bytes.

RE: Networking Stats - Socket Data Usage (sent/received data amount)

Achim Kraus — Wed, 02 Oct 2024 14:47:34 GMT

I'm used to "AT%XCONNSTAT?", which works pretty well on the nRF91 series. I'm not common to other approaches.