Codes Javascript Node-Red [EDC

Codes Javascript Node-Red

Payload est affecté à un nouvel objet^[1] de la classe Date. Réf : act-3-NR : Introduction à Nodered

msg.payload = new Date();
return msg;

msg.payload = new Date();
return msg;

Mots - clés : Objet^[1].Variable^[2].....

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NR --> Pour décomposer la date en données numériques ( Années, Mois, Jour, Heure)⚓

const dateNow = {'payload': formatDate()}
function formatDate(){
//29 Aug 2021 06:15:36
    let date = new Date();
    let year = new Intl.DateTimeFormat('en', { year: 'numeric' }).format(date);
    let month  = new Intl.DateTimeFormat('en', { month: 'short' }).format(date);
    let day = new Intl.DateTimeFormat('en', { day: '2-digit' }).format(date);
    let time = date.toLocaleTimeString('en-US', { hour12: false });
    return `${day} ${month} ${year} ${time}`;
}
return dateNow

const dateNow = {'payload': formatDate()}

function formatDate(){
//29 Aug 2021 06:15:36
    let date = new Date();
    let year = new Intl.DateTimeFormat('en', { year: 'numeric' }).format(date);
    let month  = new Intl.DateTimeFormat('en', { month: 'short' }).format(date);
    let day = new Intl.DateTimeFormat('en', { day: '2-digit' }).format(date);
    let time = date.toLocaleTimeString('en-US', { hour12: false });
    return `${day} ${month} ${year} ${time}`;
}

return dateNow

Payload contient l'objet renvoyé par une API. Il faut connaître la(ou les) propriété(s) qui nous intéressent : ici, on récupère la localisation et la température souhaitée.

Réf : act-4 : IPN-API openweathermap

var T;
T=msg.payload.tempc;
msg.payload ="La température à "+ msg.payload.location+ " est de "+T+" °C"
return msg;

var T;
T=msg.payload.tempc;
msg.payload ="La température à "+ msg.payload.location+ " est de "+T+" °C"
return msg;

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Payload contient la température en °C que l'on affecte à une variable C qui, de fait sera un numérique, car dans le noeud qui précède la fonction, il a été décidé que payload était un nombre.

On calcule les dégrés Fahrenheit.

On compose le texte que l'on va transmettre dans le flux en réaffectant la variable msg.payload.

Réf : act-5-NR : Conversion °C en °F

var C = msg.payload ;
var F = C*1.8 + 32;
msg.payload = C + "°C = "+F.toString()+ "°F";
return msg;

var C = msg.payload ;
var F = C*1.8 + 32;
msg.payload = C + "°C = "+F.toString()+ "°F";
return msg;

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Nous allons gérer une consigne de température qui sera mémorisé globalement au niveau de node-red. Cela signifie que cette valeur sera disponible dans tous les FLOW. Les autres choix sont de conserver une variable dite de contexte au niveau du FLOW courant ou bien au niveau du NODE.

Cette consigne sera ensuite mise à profit pour décider d'une action en fonction de la comparaison entre une valeur mesurée et la valeur dite de consigne.

Ensuite, il vous appartiendra de vous entraîner en réalisant une conversion de température paramétrable.

Ref : act-8-NR : Test (SI) avec Node-red)

On peut remplacer les noeuds switch et change par une fonction :

// La consigne affectée à global.consigne dans le NODE Set peut-être lue en js par global.get('consigne')
if (msg.payload > global.get('consigne') {
    msg.payload = "SUP A 20";
} else {
    msg.payload = "";
}
return msg;

// La consigne affectée à global.consigne dans le NODE Set peut-être lue en js par global.get('consigne')
if (msg.payload > global.get('consigne') {
    msg.payload = "SUP A 20";
} else {
    msg.payload = "";
}
return msg;

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