RRDTool

Introduction

One wanting to log periodic data on his embedded system with a standard and robust method might be interested by the following instructions.

From wikipedia: "RRDtool (round-robin database tool) aims to handle time series data. The data are stored in a circular buffer based database, thus the system storage footprint remains constant over time. It also includes tools to extract round-robin data in a graphical format, for which it was originally intended. Bindings exist for several programming languages."

Installation

$ make menuconfig

...
Target packages  --->
    ...
    Graphic libraries and applications (graphic/text)  --->
        ...
        [*] rrdtool

• then reflash your rootfs

Usage

• Check your system has the correct date/time:

# date

• If not, then set it ;-)
• Create the database:

# rrdtool create /data/battery.rrd --step 120 DS:cap:GAUGE:240:0:100 RRA:AVERAGE:0.5:1:1200

• Feed the script with data (XX):

rrdtool update /data/battery.rrd -- N:

Links

• https://oss.oetiker.ch/rrdtool/