arednsig/docs/rrd_spec
43389052
 rrdtool create /home/pi/database/arednstatData.rrd --step 60 DS:S:GAUGE:120:U:U DS:N:GAUGE:120:U:U DS:SNR:GAUGE:120:U:U DS:RX_MCS:GAUGE:120:U:U DS:TX_MCS:GAUGE:120:U:U DS:RX_RATE:GAUGE:120:U:U DS:TX_RATE:GAUGE:120:U:U RRA:LAST:0.5:1:1440 RRA:LAST:0.5:15:35520