Lighting I use sensor to turn on light on staircase between 7pm till 8am and will on the light when someone pass by using 2 human sensor, one down stairs and 1 upstairs. It will turn off after 1 mins. For kitchen and bedroom, turn on gateway light when it is dark using human sensor, good for when u go to kitchen to get a drink or wake up at night to go toilet as it only turn on when it is dark.
For Alarms, all human sensor and doors windows sensor are uses and will siren all 3 gateway if door/window open or human sensor detect movement. The alarms will turn on at 12am daily and off 6am daily, just have to remember to off if u need to open door at midnight.
For smoke and gas detector, it is for safety purposes, hopefully it will not be turn on and if it really turn on, it may help save my family from fire or gas explosion.
For light and fan in bedroom, due to distance from the wall switch, it is alternative solution to have on off switch close to bed. Also I have a wireless switch at study room to control, fan, light and exhaust fan with single click to on everything, double click to only on fan and light and hold click to close everyrhing.
For CCTV, yup, only for monitoring purposes and does not need to connect to gateway, it is standalone device but can be use to monitor movement and send notification to phone or activate other devices, so far didn't use as human sensor is more realiable.
Seldom use phone to on off the light fan and etc, the phone is only for me to on off alarms and look at CCTV.