neb: One general observation, anything wireless that doesn't use 802.11 is going to be full of security holes, and even when it uses a known standard like 802.11 s often horribly vulnerable, e.g. Wifi de-auth and then Pineapple it. Depends on what level of attack you're expecting, I have wired everything because then I don't have to worry about someone sitting across the street remotely disabling the sensors and alarm before breaking in at their leisure.

Thanks for pointing out the potential vulnerabilities of the wireless network. I guess that I would be happy to prevent attacks at the rudimentary level. I also consider adding another layer of protection. The Ring alarm system is currently on sale (USD 99 https://www.bhphotovideo.com/c/product/1448901-REG/ring_4k11s7_0en0_alarm_home_security_kit.html Note. the range extender seems to only work for 110v. But this may not be an issue as my house is not large - 90 square meters). I may use Eufy cam for the front door and the Ring alarm for the rest of the house.