Maybe we can follow up here: http://community.mydevices.com/t/esp8266-temperature-humidity-monitor-with-htu21d/1596/3
Inserting my working function into CAYENNE_OUT(V1) will also not work, i still get an reboot. Sorry but i have absolutely no idea what causes the problem.
I think it is cayenne problem as HTU21d i not such an exotic sensor…