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Internet of Things

IoT Drivers allow any Odoo module to communicate in real-time with any device connected to the IoT Box. Communication with the IoT Box goes both ways, so the Odoo client can send commands to and receive information from any of the supported devices. To add support for a device, all we need is a Driver.

At each boot, the IoT Box will load all of the Drivers that can be located on the connected Odoo instance. Each module can contain a drivers directory, whose content will be copied to the IoT Box.

Detect Devices

The addons/hw_drivers/controllers/driver.py file contains a Manager that is in charge of the devices. The Manager maintains a list of connected devices and associates them with the right Driver.

Supported devices will appear both on the IoT Box Homepage that you can access through its IP address and in the IoT module of the connected Odoo instance.

Driver

Once the Manager has retrieved the list of detected devices, it will loop through all of the Drivers that have the same connection type and test their respective supported method on all detected devices. If the supported method of a Driver returns True, an instance of this Driver will be created for the corresponding device.

Creating a new Driver requires:

  • Extending Driver
  • Setting the connection_type class attribute.
  • Setting the device_type, device_connection and device_name attributes.
  • Defining the supported method
from odoo.addons.hw_drivers.controllers.driver import Driver

class DriverName(Driver):
    connection_type = 'ConnectionType'

    def __init__(self, device):
        super(NewDriver, self).__init__(device)
        self._device_type = 'DeviceType'
        self._device_connection = 'DeviceConnection'
        self._device_name = 'DeviceName'

    @classmethod
    def supported(cls, device):
        ...

Communicate With Devices

Once your new device is detected and appears in the IoT module, the next step is to communicate with it. Since the box only has a local IP address, it can only be reached from the same local network. Communication, therefore, needs to happen on the browser-side, in JavaScript.

The process depends on the direction of the communication: - From the browser to the box, through Actions - From the box to the browser, through Longpolling

Both channels are accessed from the same JS object, the DeviceProxy, which is instantiated using the IP of the IoT Box and the device identifier.

var DeviceProxy = require('iot.widgets').DeviceProxy;

var iot_device = new DeviceProxy({
    iot_ip: iot_ip,
    identifier: device_identifier
});

Actions

Actions are used to tell a selected device to execute a specific action, such as taking a picture, printing a receipt, etc.

An action can be performed on the DeviceProxy Object.

iot_device.action(data);

In your driver, define an action method that will be executed when called from an Odoo module. It takes the data given during the call as argument.

def action(self, data):
    ...

Longpolling

When any module in Odoo wants to read data from a specific device, it creates a listener identified by the IP/domain of the box and the device identifier and passes it a callback function to be called every time the device status changes. The callback is called with the new data as argument.

iot_device.add_listener(this._onValueChange.bind(this));

_onValueChange: function (result) {
    ...
}

In the Driver, an event is released by calling the device_changed function from the event_manager. All callbacks set on the listener will then be called with self.data as argument.

from odoo.addons.hw_drivers.controllers.driver import event_manager

class DriverName(Driver):
    connection_type = 'ConnectionType'

    def methodName(self):
        self.data = {
            'value': 0.5,
            ...
        }
        event_manager.device_changed(self)