RT-AX57 coverage

[tiomiguel]

I have one RT-AX57 central located for covering whole home. It does well but worst devices are two IOT bulb devices at -81 dB signal with noise at -98 dB
¿Is enough for these devices?
What is minimun signal to noise ratio for these IOT devices work?
What is important, signal level, noise leve, signal to noise margin?

 

[Tech9]

RSSI below -80dBm is at the edge of usable coverage. Light bulbs need minimum data traffic to operate and as long as they stay connected - all good.