@Ranjib
I have loaded reef pi 3.0 rc1 and have a weird behavior with temp sensors. First off this is being tested on my bullet proof build that was happily running the 3.0 alpha release for months.
Upgrading from 3.0 alpha i had some temp sensors missing so I deleted them all and remade the sensors. All is good and they happily work.
Upon a reload of reef pi a temp sensor will randomly be missing once it reloads. If you delete and remake that sensor it works fine until you do another reef pi reload. I can see all sensors when ssh into pi and issue the command to see them on the onewire bus.
In short:
Sensors created and work fine but upon reef pi reload they will randomly quit working. After deleting and recreating the sensor it will again work fine until a reef pi reload.
This is definitely reef pi software related as going back to 3.0 alpha everything works.
The lighting in reef pi 3.0rc1 seems to be working !