168 lines
6.9 KiB
Markdown
168 lines
6.9 KiB
Markdown
# enduser setup Module aka Captive Portal aka WiFi Manager
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| Since | Origin / Contributor | Maintainer | Source |
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| :----- | :-------------------- | :---------- | :------ |
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| 2015-09-02 | [Robert Foss](https://github.com/robertfoss) | [Robert Foss](https://github.com/robertfoss) | [enduser_setup.c](../../app/modules/enduser_setup.c)|
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This module provides a simple way of configuring ESP8266 chips without using a
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serial interface or pre-programming WiFi credentials onto the chip.
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After running [`enduser_setup.start()`](#enduser_setupstart), a wireless
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network named "SetupGadget_XXXXXX" will starting. This prefix can be overridden
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in `user_config.h` by defining `ENDUSER_SETUP_AP_SSID`. Connect to that SSID
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and then navigate to the root of any website or to 192.168.4.1.
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`http://example.com/` will work, but do not use `.local` domains because it
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will fail on iOS. A web page similar to the one depicted below will load,
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allowing the end user to provide their Wi-Fi credentials.
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After an IP address has been successfully obtained, then this module will stop
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as if [`enduser_setup.stop()`](#enduser_setupstop) had been called. There is a
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10-second delay before teardown to allow connected clients to obtain a last
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status message while the SoftAP is still active.
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Alternative HTML can be served by placing a file called `enduser_setup.html` on
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the filesystem. Everything needed by the web page must be included in this one
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file. This file will be kept in RAM, so keep it as small as possible. The file
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can be gzip'd ahead of time to reduce the size (i.e., using `gzip -n` or
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`zopfli`), and when served, the End User Setup module will add the appropriate
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`Content-Encoding` header to the response.
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*Note: If gzipped, the file can also be named `enduser_setup.html.gz` for
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semantic purposes. GZIP encoding is determined by the file's contents, not the
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filename.*
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### Additional configuration parameters
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You can also add some additional inputs in the `enduser_setup.html` (as long as
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you keep those needed for the WiFi setup). The additional data will be written
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in a `eus_params.lua` file in the root filesystem of the ESP8266, which you can
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then load in your own code. In this case, the data will be saved as a set of
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variables with the name being the input name, and the value being a string
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representing what you put in the form.
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For instance, if your HTML contains two additional inputs:
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```html
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<input name=timeout_delay type=text placeholder="Delay in seconds" />
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<input name=device_name type=text placeholder="Unique device name" />
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```
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Then the `eus_params.lua` file will contain the following:
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```lua
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-- those wifi_* are the base parameters that are saved anyway
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local p = {}
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p.wifi_ssid="ssid"
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p.wifi_password="password"
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-- your own parameters:
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p.timeout_delay="xxx"
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p.device_name="yyy"
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return p
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```
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### How to use the eus_params.lua file
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Simply include the file by using the `dofile` function:
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```lua
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p = dofile('eus_params.lua')
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-- now use the parameters in the Lua table
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print("Wifi device_name: " .. p.device_name)
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```
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### HTTP endpoints:
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|Path|Method|Description|
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|----|------|-----------|
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|/|GET|Returns HTML for the web page. Will return the contents of `enduser_setup.html` if it exists on the filesystem, otherwise will return a page embedded into the firmware image.|
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|/aplist|GET|Forces the ESP8266 to perform a site survey across all channels, reporting access points that it can find. Return payload is a JSON array: `[{"ssid":"foobar","rssi":-36,"chan":3}]`|
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|/generate_204|GET|Returns a HTTP 204 status (expected by certain Android clients during Wi-Fi connectivity checks)|
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|/status|GET|Returns plaintext status description, used by the web page|
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|/status.json|GET|Returns a JSON payload containing the ESP8266's chip id in hexadecimal format and the status code: 0=Idle, 1=Connecting, 2=Wrong Password, 3=Network not Found, 4=Failed, 5=Success|
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|/setwifi|POST|HTML form post for setting the WiFi credentials. Expects HTTP content type `application/x-www-form-urlencoded`. Supports sending and storing additinal configuration parameters (as input fields). Returns the same payload as `/status.json` instead of redirecting to `/`. See also: `/update`.|
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|/update|GET|Data submission target. Example: `http://example.com/update?wifi_ssid=foobar&wifi_password=CorrectHorseBatteryStaple`. Will redirect to `/` when complete. Note that will NOT update the `eus_params.lua` file i.e. it does NOT support sending arbitrary parameters. See also: `/setwifi`. |
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Module functions are described below.
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## enduser_setup.manual()
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Controls whether manual AP configuration is used.
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By default the `enduser_setup` module automatically configures an open access
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point when starting, and stops it when the device has been successfully joined
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to a WiFi network. If manual mode has been enabled, neither of this is done.
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The device must be manually configured for `wifi.SOFTAP` mode prior to calling
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`enduser_setup.start()`. Additionally, the portal is not stopped after the
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device has successfully joined to a WiFi network.
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#### Syntax
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`enduser_setup.manual([on_off])`
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#### Parameters
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- `on_off` a boolean value indicating whether to use manual mode; if not
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given, the function only returns the current setting.
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#### Returns
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The current setting, true if manual mode is enabled, false if it is not.
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#### Example
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```lua
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wifi.setmode(wifi.STATIONAP)
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wifi.ap.config({ssid="MyPersonalSSID", auth=wifi.OPEN})
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enduser_setup.manual(true)
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enduser_setup.start(
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function()
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print("Connected to WiFi as:" .. wifi.sta.getip())
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end,
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function(err, str)
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print("enduser_setup: Err #" .. err .. ": " .. str)
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end
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)
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```
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## enduser_setup.start()
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Starts the captive portal.
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*Note: Calling start() while EUS is already running is an error, and will result in stop() to be invoked to shut down EUS.*
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#### Syntax
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`enduser_setup.start([onConnected()], [onError(err_num, string)], [onDebug(string)])`
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#### Parameters
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- `onConnected()` callback will be fired when an IP-address has been obtained, just before the enduser_setup module will terminate itself
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- `onError()` callback will be fired if an error is encountered. `err_num` is a number describing the error, and `string` contains a description of the error.
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- `onDebug()` callback is disabled by default (controlled by `#define ENDUSER_SETUP_DEBUG_ENABLE` in `enduser_setup.c`). It is intended to be used to find internal issues in the module. `string` contains a description of what is going on.
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#### Returns
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`nil`
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#### Example
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```lua
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enduser_setup.start(
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function()
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print("Connected to WiFi as:" .. wifi.sta.getip())
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end,
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function(err, str)
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print("enduser_setup: Err #" .. err .. ": " .. str)
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end,
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print -- Lua print function can serve as the debug callback
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)
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```
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## enduser_setup.stop()
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Stops the captive portal.
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#### Syntax
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`enduser_setup.stop()`
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#### Parameters
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none
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#### Returns
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`nil`
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