1093dea709
For esp32 and esp8266 this commit adds: - a 'pm' option to WLAN.config() to set/get the wifi power saving mode; and - PM_NONE, PM_PERFORMANCE and PM_POWERSAVE constants to the WLAN class. This API should be general enough to use with all WLAN drivers. Documentation is also added.
153 lines
5.8 KiB
ReStructuredText
153 lines
5.8 KiB
ReStructuredText
.. currentmodule:: network
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.. _network.WLAN:
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class WLAN -- control built-in WiFi interfaces
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==============================================
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This class provides a driver for WiFi network processors. Example usage::
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import network
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# enable station interface and connect to WiFi access point
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nic = network.WLAN(network.STA_IF)
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nic.active(True)
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nic.connect('your-ssid', 'your-key')
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# now use sockets as usual
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Constructors
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------------
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.. class:: WLAN(interface_id)
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Create a WLAN network interface object. Supported interfaces are
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``network.STA_IF`` (station aka client, connects to upstream WiFi access
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points) and ``network.AP_IF`` (access point, allows other WiFi clients to
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connect). Availability of the methods below depends on interface type.
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For example, only STA interface may `WLAN.connect()` to an access point.
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Methods
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-------
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.. method:: WLAN.active([is_active])
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Activate ("up") or deactivate ("down") network interface, if boolean
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argument is passed. Otherwise, query current state if no argument is
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provided. Most other methods require active interface.
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.. method:: WLAN.connect(ssid=None, key=None, *, bssid=None)
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Connect to the specified wireless network, using the specified key.
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If *bssid* is given then the connection will be restricted to the
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access-point with that MAC address (the *ssid* must also be specified
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in this case).
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.. method:: WLAN.disconnect()
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Disconnect from the currently connected wireless network.
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.. method:: WLAN.scan()
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Scan for the available wireless networks.
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Hidden networks -- where the SSID is not broadcast -- will also be scanned
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if the WLAN interface allows it.
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Scanning is only possible on STA interface. Returns list of tuples with
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the information about WiFi access points:
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(ssid, bssid, channel, RSSI, security, hidden)
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*bssid* is hardware address of an access point, in binary form, returned as
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bytes object. You can use `binascii.hexlify()` to convert it to ASCII form.
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There are five values for security:
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* 0 -- open
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* 1 -- WEP
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* 2 -- WPA-PSK
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* 3 -- WPA2-PSK
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* 4 -- WPA/WPA2-PSK
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and two for hidden:
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* 0 -- visible
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* 1 -- hidden
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.. method:: WLAN.status([param])
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Return the current status of the wireless connection.
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When called with no argument the return value describes the network link status.
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The possible statuses are defined as constants:
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* ``STAT_IDLE`` -- no connection and no activity,
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* ``STAT_CONNECTING`` -- connecting in progress,
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* ``STAT_WRONG_PASSWORD`` -- failed due to incorrect password,
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* ``STAT_NO_AP_FOUND`` -- failed because no access point replied,
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* ``STAT_CONNECT_FAIL`` -- failed due to other problems,
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* ``STAT_GOT_IP`` -- connection successful.
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When called with one argument *param* should be a string naming the status
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parameter to retrieve. Supported parameters in WiFI STA mode are: ``'rssi'``.
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.. method:: WLAN.isconnected()
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In case of STA mode, returns ``True`` if connected to a WiFi access
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point and has a valid IP address. In AP mode returns ``True`` when a
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station is connected. Returns ``False`` otherwise.
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.. method:: WLAN.ifconfig([(ip, subnet, gateway, dns)])
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Get/set IP-level network interface parameters: IP address, subnet mask,
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gateway and DNS server. When called with no arguments, this method returns
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a 4-tuple with the above information. To set the above values, pass a
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4-tuple with the required information. For example::
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nic.ifconfig(('192.168.0.4', '255.255.255.0', '192.168.0.1', '8.8.8.8'))
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.. method:: WLAN.config('param')
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WLAN.config(param=value, ...)
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Get or set general network interface parameters. These methods allow to work
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with additional parameters beyond standard IP configuration (as dealt with by
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`WLAN.ifconfig()`). These include network-specific and hardware-specific
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parameters. For setting parameters, keyword argument syntax should be used,
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multiple parameters can be set at once. For querying, parameters name should
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be quoted as a string, and only one parameter can be queries at time::
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# Set WiFi access point name (formally known as SSID) and WiFi channel
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ap.config(ssid='My AP', channel=11)
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# Query params one by one
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print(ap.config('ssid'))
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print(ap.config('channel'))
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Following are commonly supported parameters (availability of a specific parameter
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depends on network technology type, driver, and :term:`MicroPython port`).
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============= ===========
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Parameter Description
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============= ===========
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mac MAC address (bytes)
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ssid WiFi access point name (string)
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channel WiFi channel (integer)
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hidden Whether SSID is hidden (boolean)
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security Security protocol supported (enumeration, see module constants)
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key Access key (string)
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hostname The hostname that will be sent to DHCP (STA interfaces) and mDNS (if supported, both STA and AP). (Deprecated, use :func:`network.hostname` instead)
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reconnects Number of reconnect attempts to make (integer, 0=none, -1=unlimited)
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txpower Maximum transmit power in dBm (integer or float)
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pm WiFi Power Management setting (see below for allowed values)
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============= ===========
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Constants
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---------
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.. data:: WLAN.PM_PERFORMANCE
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WLAN.PM_POWERSAVE
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WLAN.PM_NONE
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Allowed values for the ``WLAN.config(pm=...)`` network interface parameter:
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* ``PM_PERFORMANCE``: enable WiFi power management to balance power
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savings and WiFi performance
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* ``PM_POWERSAVE``: enable WiFi power management with additional power
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savings and reduced WiFi performance
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* ``PM_NONE``: disable wifi power management
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