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72 lines
2.6 KiB
72 lines
2.6 KiB
WLAN step by step
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=================
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The WLAN is a system feature of the WiPy, therefore it is always enabled
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(even while in ``machine.SLEEP``), except when deepsleep mode is entered.
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In order to retrieve the current WLAN instance, do::
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>>> from network import WLAN
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>>> wlan = WLAN() # we call the constructor without params
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You can check the current mode (which is always ``WLAN.AP`` after power up)::
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>>> wlan.mode()
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.. warning::
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When you change the WLAN mode following the instructions below, your WLAN
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connection to the WiPy will be broken. This means you will not be able
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to run these commands interactively over the WLAN.
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There are two ways around this::
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1. put this setup code into your :ref:`boot.py file<wipy_filesystem>` so that it gets executed automatically after reset.
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2. :ref:`duplicate the REPL on UART <wipy_uart>`, so that you can run commands via USB.
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Connecting to your home router
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------------------------------
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The WLAN network card always boots in ``WLAN.AP`` mode, so we must first configure
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it as a station::
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from network import WLAN
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wlan = WLAN(mode=WLAN.STA)
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Now you can proceed to scan for networks::
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nets = wlan.scan()
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for net in nets:
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if net.ssid == 'mywifi':
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print('Network found!')
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wlan.connect(net.ssid, auth=(net.sec, 'mywifikey'), timeout=5000)
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while not wlan.isconnected():
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machine.idle() # save power while waiting
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print('WLAN connection succeeded!')
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break
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Assigning a static IP address when booting
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------------------------------------------
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If you want your WiPy to connect to your home router after boot-up, and with a fixed
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IP address so that you can access it via telnet or FTP, use the following script as /flash/boot.py::
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import machine, network
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from network import WLAN
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wlan = WLAN() # get current object, without changing the mode
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if machine.reset_cause() != machine.SOFT_RESET:
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wlan.init(WLAN.STA)
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# configuration below MUST match your home router settings!!
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network.ipconfig(dns='8.8.8.8')
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wlan.ipconfig(addr4='192.168.0.107/24', gw4='192.168.0.1')
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if not wlan.isconnected():
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# change the line below to match your network ssid, security and password
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wlan.connect('mywifi', auth=(WLAN.WPA2, 'mywifikey'), timeout=5000)
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while not wlan.isconnected():
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machine.idle() # save power while waiting
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.. note::
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Notice how we check for the reset cause and the connection status, this is crucial in order
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to be able to soft reset the WiPy during a telnet session without breaking the connection.
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