we are building professional rooms with esp devices and controlled by node-red. i want to keep stay online and staying alive on mqtt broker. i have keep alive callback commands on mqtt, if device lost connection somehow then sometimes its keep offline this is my main problem.
devices(esp32 and ...

i have node-red connected esp devices(10-15pcs)

i have wifi and mqtt reconnect function but i have kinda weird issue

while devices are on, if i turn off router and turn on quick, on router its says my esp devices are connected(shows 10-20 Mbit/s) normalls its 150 Mbit/s

and on device serial ...