### Create a Simple HTTP Server

Source: https://nodemcu.readthedocs.io

This snippet demonstrates how to create a basic TCP server that listens on port 80 and responds to incoming HTTP requests with a 'Hello, NodeMCU.' message.

```lua
-- a simple HTTP server
srv = net.createServer(net.TCP)
srv:listen(80, function(conn)
  conn:on("receive", function(sck, payload)
    print(payload)
    sck:send("HTTP/1.0 200 OK\r\nContent-Type: text/html\r\n\r\n<h1> Hello, NodeMCU. </h1>")
  end)
  conn:on("sent", function(sck) sck:close() end)
end)

```

--------------------------------

### Manipulate Hardware GPIO Pins

Source: https://nodemcu.readthedocs.io

Demonstrates basic hardware manipulation by configuring a GPIO pin as an output, setting its state to high, and then reading its current state.

```lua
-- manipulate hardware like with Arduino
pin = 1
gpio.mode(pin, gpio.OUTPUT)
gpio.write(pin, gpio.HIGH)
print(gpio.read(pin))

```

--------------------------------

### Connect to WiFi Access Point

Source: https://nodemcu.readthedocs.io

Configures the NodeMCU to connect to a WiFi access point using the provided SSID and password. The configuration is not saved to flash.

```lua
-- connect to WiFi access point (DO NOT save config to flash)
wifi.setmode(wifi.STATION)
station_cfg={}
station_cfg.ssid = "SSID"
station_cfg.pwd = "password"
station_cfg.save = false
wifi.sta.config(station_cfg)

```

--------------------------------

### Register WiFi Event Callbacks

Source: https://nodemcu.readthedocs.io

Registers event callbacks for WiFi events, specifically for when the station interface connects to an access point. It prints connection details upon successful connection.

```lua
-- register event callbacks for WiFi events
wifi.eventmon.register(wifi.eventmon.STA_CONNECTED, function(T)
  print("\n\tSTA - CONNECTED".."\n\tSSID: "..T.SSID.."\n\tBSSID: "..T.BSSID.."\n\tChannel: "..T.channel)
end)

```

=== COMPLETE CONTENT === This response contains all available snippets from this library. No additional content exists. Do not make further requests.