@emme I think you'll find the answer for presentation in https://forum.mysensors.org/topic/6506/how-to-ask-a-node-to-re-send-presentation-info/ Reboot works the same way, except you use I_REBOOT instead. See https://www.mysensors.org/download/serial_api_20#internal

I tried with two different Dallas Onewire and checked out the library at github. Have build these sensors before but got -127 all the time. Just adding this here if it pops up alof of people having issues...