The wifi.on ('disconnected') event fires only once.

Hello everybody.

Faced the problem of reconnecting to the WiFi network through the wifi.on (‘connected’) event.
Program code:

var ssid = 'ssid';
var password = 'password';
wifi.stopAP();
wifi.connect(ssid, { password:password },()=>{wifi.save();});
wifi.on('connected',()=>{console.log(wifi.getIP());});
wifi.on('disconnected',()=>{console.log("WiFi network lost."); wifi.connect(ssid,{password:password});});

When you first start wifi.on (‘connected’), it works:
{
"ip": "192.168.0.10",
"netmask": "255.255.255.0",
"gw": "192.168.0.1",
"mac": "a4:cf:12:75:38:ec"
}

I turn off the router with my hands:

E (113206) event: post event to user fail!
E (115622) event: post event to user fail!
E (118037) event: post event to user fail!
E (120453) event: post event to user fail!
WiFi network lost.
WiFi network lost.
WiFi network lost.

Obviously wifi.on (‘disconnected’) - it worked.

I turn on the router, I get a message from wifi.on (‘connected’):

{
"ip": "192.168.0.10",
"netmask": "255.255.255.0",
"gw": "192.168.0.1",
"mac": "a4:cf:12:75:38:ec"
}

And that’s it. If I turn off the router again, then no events occur.
Moreover, if you give the wifi.getIP () command when the router is off, then we get.

{
ip: "192.168.0.10",
netmask: "255.255.255.0",
gw: "192.168.0.1",
mac: "a4:cf:12:75:38:ec"
}

(the router has been turned off for more than two minutes)
That is, the board does not understand that wifi / network is no more.

Question:

1. So it should be or is it a mistake?
   
2. If so, how should it be in this case to determine the absence of a network and reconnect to it?
   
   

PS So far, the only working option I have found is the gateway ping once every 30 seconds, and if (rateTime> 1000) {e.Reboot ()};

But I think this is not the best option :)
PPS Sorry for the presentation - English is not my native language.

I will be glad to any advice. Thanks.