var wifi = require("Wifi"); wifi.scan((ap)=>print(ap));

Wemos NodeMCU V3 is a nice dev board. It is ashamed that Espruino WiFi is not
working on it. I've managed to compile Espruino with SDK 3.0.6-dev(865fa65). The
SDK used with Arduino. But sadly, still problem with Espruino WiFi.

Wemos NodeMCU V3 ESP8266

process.env
={
VERSION: "2v12.58",
GIT_COMMIT: "f148c737",
BOARD: "ESP8266_ME",
FLASH: 0, STORAGE: 196608, RAM: 81920,
SERIAL: "d8f15b07-1f41",
CONSOLE: "Serial1",
MODULES: "Flash,Storage,hea" ... "r,crypto,neopixel",
EXPTR: 1073648148 }

var esp=require("ESP8266")

esp.getState()
={
sdkVersion: "3.0.6-dev(865fa65)",
cpuFrequency: 80, freeHeap: 12752, maxCon: 10,
flashMap: "4MB:512/512",
flashKB: 4096,
flashChip: "0x20 0x4016"
}

var wifi=require('Wifi')

wifi.stopAP()

wifi.getStatus()
={
mode: "off",
station: "off",
ap: "disabled",
phy: "11n",
powersave: "ps-poll",
savedMode: "off"
}

wifi.scan((w)=>print(w))
[ ]

wifi.getStatus()
={
mode: "sta",
station: "off",
ap: "disabled",
phy: "11n",
powersave: "ps-poll",
savedMode: "off"
}

wifi.scan((w)=>print(w))
[ ]

now on another board. AI ESP-12S ESP8266

process.env
={
VERSION: "2v12.58",
GIT_COMMIT: "f148c737",
BOARD: "ESP8266_ME",
FLASH: 0, STORAGE: 196608, RAM: 81920,
SERIAL: "e8db849c-4951",
CONSOLE: "Serial1",
MODULES: "Flash,Storage,hea" ... "r,crypto,neopixel",
EXPTR: 1073648148 }
var esp=require("ESP8266")

esp.getState()
={
sdkVersion: "3.0.6-dev(865fa65)",
cpuFrequency: 80, freeHeap: 12752, maxCon: 10,
flashMap: "4MB:512/512",
flashKB: 4096,
flashChip: "0xd8 0x4016"
}
var wifi=require('Wifi')

wifi.scan((w)=>print(w))
[
{ "rssi": -84, "channel": 1,

"authMode": "wpa2", 
"isHidden": false, 
"ssid": "NextGenTel_6332", 
"mac": "60:03:a6:2e:63:32"

},
...
...
{ "rssi": -81, "channel": 11,

"authMode": "wpa2", 
"isHidden": false, 
"ssid": "Telenor7783gre", 
"mac": "b8:ec:a3:53:24:83"

}
]

So newer SDK does not solve the problem. I think it is a hardware problem. Can the chip did not get enough power during WiFi operation. I say this because I got brown out when using Espruino on ESP32 hub without external power.