ESP32 NodeMCU Module – WiFi

Functions

• wifi.getchannel()  Gets the current WiFi channel.
• wifi.getmode()  Gets WiFi operation mode.
• wifi.mode()  Configures the WiFi mode to use.
• wifi.start()  Starts the WiFi interface(s).
• wifi.stop()  Shuts down the WiFi interface(s).
• wifi.sta.config()  Sets the WiFi station configuration.
• wifi.sta.connect()  Connects to the configured AP in station mode.
• wifi.sta.disconnect()  Disconnects from AP in station mode.
• wifi.sta.on()  Registers callbacks for WiFi station status events.
• wifi.sta.scan()  Scan for available networks.
• wifi.ap.config()  Configures the AP.
• wifi.ap.on()  Registers callbacks for WiFi AP events.

 

Scan for available all station networks

wifi.start()
-- Scan and print all found APs, including hidden ones
wifi.sta.scan({ hidden = 1 }, function(err,arr)
  if err then
    print ("Scan failed:", err)
  else
    print(string.format("%-26s","SSID"),"Channel BSSID              RSSI Auth Bandwidth")
    for i,ap in ipairs(arr) do
      print(string.format("%-32s",ap.ssid),ap.channel,ap.bssid,ap.rssi,ap.auth,ap.bandwidth)
    end
    print("-- Total APs: ", #arr)
  end
end)

 

Connect ESP32 to WiFi Router

print("wifi init")
wifi.start()
wifi.mode(wifi.STATIONAP)

--connect to Access Point (DO NOT save config to flash)
station_cfg={}
station_cfg.ssid="ArunEworld"
station_cfg.pwd="Arun"
wifi.sta.config(station_cfg)

wifi.sta.connect()

WiFi Event Monitoring for Station Mode

Check the device connected to WiFi router?

--register callback
wifi.sta.on("connected", function(ev, info)
	print("Connected to Router")
	print("NodeMCU IP Connected ssid", info.ssid, "bssid", info.bssid, "Channel", info.channel, "Auth", info.auth)
end)

--unregister callback
wifi.sta.on("connected", nil)

 

Check the device disconnected from WiFi router?

--register callback
wifi.sta.on("disconnected", function(ev, info)
	print("disconnected to Router")
	print("NodeMCU Disconnected ssid", info.ssid, "bssid", info.bssid, "reason", info.reason)
end)

--unregister callback
wifi.sta.on("disconnected", nil)

 

Check the device authentication mode changed in WiFi router?

--register callback
wifi.sta.on("authmode_changed", function(ev, info)
print("authmode_changed in Router")
print("NodeMCU authmode_changed old_mode", info.old_mode, "new_mode", info.new_mode)
end)

--unregister callback
wifi.sta.on("authmode_changed", nil)

 

Check the device got IP from WiFi router?

--register callback
wifi.sta.on("got_ip", function(ev, info)
  print("NodeMCU IP config:", info.ip, "netmask", info.netmask, "gw", info.gw)
end)

--unregister callback
wifi.sta.on("got_ip", nil)

 

Set ESP32 as Access Point Mode

wifi.start()
cfg={}
cfg.ssid="ArunEworld"
cfg.pwd="Arun"
wifi.ap.config(cfg)

 

WiFi Event Monitoring for AP Mode

Check Which device are connected to ESP32 in AP Mode?

--register callback
wifi.ap.on("sta_connected", function(ev, info)
	print("sta_connected to Router")
	print("NodeMCU sta_connected mac", info.mac, "id", info.id)
end)

--unregister callback
wifi.ap.on("sta_connected", nil)

 

Check Which device is disconnected from ESP32 in AP Mode?

--register callback
wifi.ap.on("sta_disconnected", function(ev, info)
	print("sta_disconnected from Router")
	print("NodeMCU sta_disconnected mac", info.mac, "id", info.id)
end)

--unregister callback
wifi.ap.on("sta_disconnected", nil)

 

Check Which device have problem with ESP32 in AP Mode?

--register callback
wifi.ap.on("probe_req", function(ev, info)
	print("probe_req from Router")
	print("NodeMCU probe_req from", info.from, "rssi", info.rssi)
end)

--unregister callback
wifi.ap.on("probe_req", nil)

 

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