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webthing-php 1.0.0 | Custom (specified... | 5 | PHP 5, Web services, Hardware, PSR |
Implementation of an HTTP Web Thing. This library is compatible with PHP 7.1+.
The `webthing
can be installed using
composer
` via the following command:
composer require webthing/webthing:^0.0.1
The following list of commands clones this repository and installs all dependencies using the composer and runs the single-thing.php
example.
git clone https://github.com/maliknaik16/webthing-php.git
cd webthing-php
composer install
php examples/single-thing.php
In this code-walkthrough we will set up a dimmable light and a humidity sensor (both using fake data, of course). Both working examples can be found in here.
Imagine you have a dimmable light that you want to expose via the web of things API. The light can be turned on/off and the brightness can be set from 0% to 100%. Besides the name, description, and type, a Light is required to expose two properties:
- `on
`: the state of the light, whether it is turned on or off
- Setting this property via a ``PUT {"on": true/false}`` call to the REST API toggles the light.
- `brightness
`: the brightness level of the light from 0-100%
- Setting this property via a PUT call to the REST API sets the brightness level of this light.
First we create a new Thing:
$light = new Thing(
'urn:dev:ops:my-lamp-1234',
'My Lamp',
['OnOffSwitch', 'Light'],
'A web connected lamp'
);
Now we can add the required properties.
The `on
property reports and sets the on/off state of the light. For this, we need to have a
Value
` object which holds the actual state and also a method to turn the light on/off. For our purposes, we just want to log the new state if the light is switched on/off.
$light->addProperty(new Property(
$light,
'on',
new Value(TRUE, function($v) {
echo "On-State is now " . $v . "\n";
}),
[
'@type' => 'OnOffProperty',
'title' => 'On/Off',
'type' => 'boolean',
'description' => 'Whether the lamp is turned on',
])
);
The `brightness
` property reports the brightness level of the light and sets the level. Like before, instead of actually setting the level of a light, we just log the level.
$light->addProperty(new Property(
$light,
'brightness',
new Value(50, function($v) {
echo "Brightness is now " . $v . "\n";
}),
[
'@type' => 'BrightnessProperty',
'title' => 'Brightness',
'type' => 'integer',
'description' => 'The level of light from 0-100',
'minimum' => 0,
'maximum' => 100,
'unit' => 'percent',
])
);
Now we can add our newly created thing to the server and start it:
// If adding more than one thing, use MultipleThings() with a name.
// In the single thing case, the thing's name will be broadcast.
$server = new WebThingServer(new SingleThing($thing), '127.0.0.1', 8888, 8081);
$server->start();
$server->startWebSocket();
This will start the server, making the light available via the WoT REST API and announcing it as a discoverable resource on your local network via mDNS.
Let's now also connect a humidity sensor to the server we set up for our light.
A MultiLevelSensor (a sensor that returns a level instead of just on/off) has one required property (besides the name, type, and optional description): `level
`. We want to monitor this property and get notified if the value changes.
First we create a new Thing:
$sensor = new Thing(
'urn:dev:ops:my-humidity-sensor-1234',
'My Humidity Sensor',
['MultiLevelSensor'],
'A web connected humidity sensor'
);
Then we create and add the appropriate property:
- `level
`: tells us what the sensor is actually reading
- Contrary to the light, the value cannot be set via an API call, as it wouldn't make much sense, to SET what a sensor is reading. Therefore, we are creating a readOnly property.
```php
$level = new Value(0.0);
$sensor->addProperty(new Property(
$sensor,
'level',
$level,
[
'@type' => 'LevelProperty',
'title' => 'Humidity',
'type' => 'number',
'description' => 'The current humidity in %',
'minimum' => 0,
'maximum' => 100,
'unit' => 'percent',
'readOnly' => TRUE,
])
);
```
Now we have a sensor that constantly reports 0%. To make it usable, we need a thread or some kind of input when the sensor has a new reading available. For this purpose we start a thread that queries the physical sensor every few seconds. For our purposes, it just calls a fake method.
// $level is a `Value` object.
// $loop is a `React\EventLoop\Factory` object.
$loop->addPeriodicTimer(7, function() use ($level) {
$new_level = readFromGpio();
printf("Setting new humidity level: %s\n", $new_level);
$level->notifyOfExternalUpdate($new_level);
});
function readFromGpio() {
return abs(70.0 rand() (-0.5 + rand()));
}
This will update our `Value
object with the sensor readings via the
$level->notifyOfExternalUpdate(readFromGpio());
call. The
Value
` object now notifies the property and the thing that the value has changed, which in turn notifies all websocket listeners.
- https://iot.mozilla.org/wot - https://iot.mozilla.org/framework/ - https://iot.mozilla.org/gateway/ - https://www.w3.org/WoT/IG/
Mozilla Public License Version 2.0
Files (32) |
File | Role | Description | ||
---|---|---|---|---|
examples (2 files) | ||||
src (1 directory) | ||||
.travis.yml | Data | Auxiliary data | ||
composer.json | Data | Auxiliary data | ||
LICENSE.txt | Lic. | Documentation | ||
README.md | Doc. | Documentation | ||
travis.sh | Data | Auxiliary data | ||
_config.yml | Data | Auxiliary data |
Files (32) | / | examples |
File | Role | Description |
---|---|---|
multiple-things.php | Class | Class source |
single-thing.php | Class | Class source |
Files (32) | / | src | / | WebThing |
File | Role | Description | ||
---|---|---|---|---|
Server (1 file, 1 directory) | ||||
Action.php | Class | Class source | ||
ActionInterface.php | Class | Class source | ||
Event.php | Class | Class source | ||
EventInterface.php | Class | Class source | ||
MultipleThings.php | Class | Class source | ||
Property.php | Class | Class source | ||
PropertyInterface.php | Class | Class source | ||
SingleThing.php | Class | Class source | ||
Thing.php | Class | Class source | ||
ThingInterface.php | Class | Class source | ||
ThingsInterface.php | Class | Class source | ||
Value.php | Class | Class source |
Files (32) | / | src | / | WebThing | / | Server |
File | Role | Description | ||
---|---|---|---|---|
Handlers (11 files) | ||||
WebThingServer.php | Class | Class source |
Files (32) | / | src | / | WebThing | / | Server | / | Handlers |
File | Role | Description |
---|---|---|
ActionHandler.php | Class | Class source |
ActionIDHandler.php | Class | Class source |
ActionsHandler.php | Class | Class source |
BaseHandler.php | Class | Class source |
EventHandler.php | Class | Class source |
EventsHandler.php | Class | Class source |
PropertiesHandler.php | Class | Class source |
PropertyHandler.php | Class | Class source |
ThingHandler.php | Class | Class source |
ThingsHandler.php | Class | Class source |
WebSocketThingHandler.php | Class | Class source |
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