nrfLogger: Reducing overhead in log files

[raju]

We are currently trying to log our sensor data to a mobile phone through uart using nrfLogger app. We have nrf51 module and we are using SDK 12.

In nrfconnect, we select the APP logging, however for every data sample info log(I) also comes along when we save the file which increases the file size enormously.

For eg. for a 14MB file, the actual data content was only 2.5 MB.

I 13:51:04.610 Notification received from 6e400003-b5a3-f393-e0a9-e50e24dcca9e, value: (0x) 2B-30-30-30-39-32-2C-2D-30-30-30-32-34-2C-2D-30-30-30-31-37, "+00092,-00024,-00017" A 13:51:04.610 "+00092,-00024,-00017" received

In the above notification the only data content is :"+00092,-00024,-00017" however we receive it twice through two different logging levels.

How can we remove info log from the saved file so that we can effectively store a lot of data in a given file size?

Thanks.

[Hung Bui]

Hi Raju,

It's not possible with nRFConnect to customize the log for now. My suggestion is to create your own application (maybe base on our nRFtoolbox or nRFUart) and you can customize your blog. The logger API provided here: https://github.com/NordicSemiconductor/nRF-Logger-API

[raju]

Thank you Hung Bui, we will create our own application and try. By the way can we save log data using this API? Since the nRFtoolbox and nRFUart applications dont have option to save data.

[Hung Bui]

I haven't used the API my self, but I assume, what the API does is to send data to the nRFLogger application. You will have to save log into file from inside nRFLogger app.