Metrics library or tool for nrf5?

[michaelhobo]

While working on some problems, I often find it useful to increment a counter at a line of code, and occasionally log the counter for developer debugging. I'd love to have some tool/library to log a set of counters for monitoring purposes, and be able to log occasionally, or export over bluetooth. Is there some tool that already exists that does this?

As a comparison, i'm thinking of Prometheus (https://prometheus.io/), but maybe more pared down for nrf5 systems and embedded use.

[ovrebekk]

Hi Michael

I can't think of any such library or tool, no. Are you thinking of the code running on the nRF52 only, or would you also need something running on the PC/phone side to process the output?

Probably the easiest way to do something like this is to output the counter state using the NRF_LOG library when needed, and then check the log output on the PC using a terminal. 

Best regards
Torbjørn

[michaelhobo]

I don't have a strong preference for how it's done. I was hoping for something more machine-processable than NRF_LOG, preferably something that could be graphed over time (on the PC/phone side). For now, I'll NRF_LOG every N passes of my while loop, but may work towards a better solution later.

[ovrebekk]

Hi Michael

I don't know if it helps, but you can use the NRF_LOG_RAW_xx API's to output RAW uart data without the normal logging prefix.

If nothing else this should make the communication more efficient, and easier to process on the receiving side. 

Best regards
Torbjørn 

[michaelhobo]

Thanks, I didn't know that, I'll try that.