rrdtool update sensordata.rrd -t temp N:26.0
rrdtool update sensordata.rrd -t light N:200
rrdtool update sensordata.rrd -t movement N:0
rrdtool update sensordata.rrd -t temp N:26.0
rrdtool update sensordata.rrd -t light N:200
rrdtool update sensordata.rrd -t movement N:0