rrdtool create mqtttemp.rrd --step 300 \
DS:temp1:GAUGE:1200:-40:50 \
DS:temp2:GAUGE:1200:-40:50 \
DS:temp3:GAUGE:1200:-40:50 \
DS:temp4:GAUGE:1200:-40:50 \
DS:temp5:GAUGE:1200:-40:50 \
DS:temp6:GAUGE:1200:-40:50 \
DS:temp7:GAUGE:1200:-40:50 \
DS:temp8:GAUGE:1200:-40:50 \
DS:temp9:GAUGE:1200:-40:50 \
DS:hum1:GAUGE:1200:0:100 \
DS:hum2:GAUGE:1200:0:100 \
DS:hum3:GAUGE:1200:0:100 \
DS:hum4:GAUGE:1200:0:100 \
DS:hum5:GAUGE:1200:0:100 \
DS:hum6:GAUGE:1200:0:100 \
DS:hum7:GAUGE:1200:0:100 \
DS:hum8:GAUGE:1200:0:100 \
DS:hum9:GAUGE:1200:0:100 \
RRA:AVERAGE:0.5:1:960 \
RRA:MIN:0.5:96:3600 \
RRA:MAX:0.5:96:3600 \
RRA:AVERAGE:0.5:96:3600