Peripheral UART example - connection interval and throughput

RE: Peripheral UART example - connection interval and throughput

run_ar — Fri, 03 Nov 2017 08:33:14 GMT

Could you post wireshark logs so I can see what is happening on air?

RE: Peripheral UART example - connection interval and throughput

leonhart88 — Mon, 23 Oct 2017 18:51:16 GMT

Sorry maybe my question wasn't entirely clear. If I keep the gap event length CONSTANT, but just change the connection interval, I kind of expected to see the data transferred slower with a larger connection interval than a shorter one.

However, on Wireshark I still see the packets being transferred very quickly.

For example, with MTU=23, 30ms connection interval, and 6 packets sent in a row, the sniffer says all 6 packets were transferred within 20ms.

If I change the connection interval to 15ms, WireShark tells me that all 6 packets were also transferred within 20ms.

This is somewhat confusing because I thought the timing values would be different. I do see with an oscilloscope that it takes 30ms and 15ms respectively to queue/send all the data though.

RE: Peripheral UART example - connection interval and throughput

run_ar — Mon, 23 Oct 2017 07:22:23 GMT

I'm guessing that with 20ms connection interval and gap event length = 3. you send 3 packets in the first event then the rest in the next. But when you extend the gap event lenght you get more buffers, and are able to send all 6 packets in the first connection event.