Hello First : sory for my bad english Second : Prtg network monitor is super, amazing good software !
Im using smtp senzor for measure temperature. Until yesterday everything was fine until the outside temperature fell down to zero degrees. Prtg senzor say no data! When the temperature is 0 or more again shows measurements. I use lan controller ( tinycontrol.eu ) and he show temperature - 2 degrees, on prtg is messeges 'no data' In settings i use : custom senzor and snmp. Limit to show measure is max 40 min -20 What I set wrong?
In thingspeak i see negative measure. Please help