In this part your are going to create instantiate a list of 2 sensors.

Every sensor will have its own organ.

Each one of those will have an automate which will change its hydrometry and temperature.

create a list of two sensor:sensors digital twin in the hub database and create two "organs" of the system that will simulate the sensor behaviour.

Each organ will simulate changes of hygrometry and temperature.

1. Create a new folder spinal-organ-sensor1 and within a file named index.js
2. in the index.js file:
   1. Require spinal-core.
   2. Get the connection
   string
   1. parameter from the config.
   js.
   1. js file in the main folder
   2. Create a function addItem. This function create, set and add an item to the list given in argument.
3. Create a function simulate. This function simulate the value of the sensor.
4. Create a function onSuccess. this function will be executed if the loading of ‘List’ is successful. For this part you to add an element to the list if the list is empty and simulate the data of this element this element.
5. Create a function onFaill. this function will be executed if the loading of ‘List’ fail. For this part if the loading fail you want to create a new list and store it into spinal-core.Load list from spinal-core.
6. Copy paste this folder into sensor2 and do the appropriate modification in index.js .

Your file sensor1/index.js should look like this.

• If you have and API to retrieve the real data of your sensor use it to send real data to the graph.
• You can run every sensor independently by running the corresponding index.js (node index.js)

// Requirement and connection
const spinalCore = require('spinal-core-connectorjs');
require('../spinal-model/models.js');
const connection_string = require("../config");
const conn = spinalCore.connect(connection_string);

// Gives random values to the hydrometry and temperature of a sensor
simulate = (sensor) => {
    const hydro = Math.floor(Math.random() * 100);
    const degrees = Math.floor(Math.random() * 30);

    sensor.hydrometry.set(hydro);
    sensor.temperature.set(degrees);

    // Repeats every second
    setTimeout(() => {
        console.log("sensor 1: data has changed");
        simulate(sensor);
    }, 1000);
};

findIndexById = (id, list) => {
    if (list.sensors.length <= 0)
        return -1;
    let i;
    
    for (i = 0; i < i < list.sensors.length && list.sensors[i].id !== id; i++);

    if (i < list.sensors.length)
        return i;
    else
        return -1;
};

//this function will be called if the list is successfully load
onSuccess = (list) => {
    const index = findIndexById(0, list);
    console.log("success 2 : index:", index);
    if (index !== -1)
        simulate(list.sensors[index]);
    else
        addItem(list);
};

//this function will be called if the list is failed to load
onFail = () => {
    const list = new SensorList();
    spinalCore.store(conn, list, "List", () => {
        addItem(list);
    });
};

spinalCore.load(conn, "List", onSuccess, onFail);