Connecting the MicroPython-powered NodeMCU to WiFi

Connect the NodeMCU to a Wireless Network

import network

##
## STA allows the esp8266 to act as a wireless client.
## AP allows the esp8266 to act as a wireless access point.
##
sta_if = network.WLAN(network.STA_IF)
ap_if  = network.WLAN(network.AP_IF)

## Check if the Network is currently active
sta_if.active()
ap_if.active()

## Check if the Network is currently configured
ap_if.ifconfig()
sta_if.ifconfig()

## Enable the Wifi Client
sta_if.active(True)

## Connect to the Wireless Network
sta_if.connect('ESSID', 'PASSWORD')

## Check if connected
sta_if.isconnected()

## Print IP address information
sta_if.ifconfig()

## Disable the Access Point
ap_if.active(False)

WebREPL

Configure and start WebREPL.

import webrepl
import webrepl_setup
webrepl.start()

Connect to the WebREPL

Use the WebREPL client provided by MicroPython.org: http://micropython.org/webrepl/
The WebREPL uses a websocket listener, so the client can be a simlple javascript enabled webpage.

Place the network configuration in to the boot.py file

MicroPython has two startup scripts: boot.py and main.py.
boot.py is executed first, followed by main.py.
We will put our network configuration in to the boot.py to ensure it properly connects to the network on startup.

import gc
import webrepl
import network

sta_if = network.WLAN(network.STA_IF)

if not sta_if.isconnected():
  print('Connecting to Network...')
  sta_if.active(True)
  sta_if.connect('ESSID', 'PASSWORD')
  while not sta_if.isconnected():
    pass

print('Network Config: ', sta_if.ifconfig())

webrepl.start()
gc.collect()