Missed readings?

[ngolf]

The sampling rate (using the influxdb command, and analysing in influxdb) for my power meter seems too low - It seems to be taken every 2s at best, sometimes with a >10s gap between measurements, during a continuous workout, e.g.

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This is with a 1s window.

The other tools (trainer road, garmin 1040) seem to have a much higher measurement interval (as my prior)

The raw data in query seems to paint the same picture, e.g. (actually, larger gap)

Note that I did not stop pedalling during the entire workout, I had no power gaps on my fit file:

[tuna-f1sh]

I can't get too much into this - I think it's outside the scope of this project - but will give some pointers I can think of:

• A .fit file has a defined one second write period so there will be a record every second, regardless of whether the device received a value from the ANT+ device. Also bare in mind many headunits apply filters on top of the data received from the ANT+ device so it might still change between records even if their was no packet from the device.
• The openant module isn't polling anything but receiving packets from ANT USB stick on a sort of notify. A power meter is configured with a 8192 period, which calculates to a 4 Hz transmission rate.
• It doesn't mean the USB stick will consistently Rx from the radio and forward Tx to the host at 4 Hz - radio issues, multiplexing etc can change it.
• In my experience however (I used the InfluxDB import for a power meter/FE comparison) it should be better than what you experienced and not have 10s gaps. I would capture and look at the logs to confirm what you are seeing in InfluxDB.