Comment vérifier simplement le bon fonctionnement de ses objets connectés ?

Nous avons de plus en plus d'objets connectés, la question est comment s'assurer de leur bon fonctionnement ? Voici un exemple de flow simple mis en oeuvre sur Node-Red pour vérifier la disponibilité de ses objets connectés et être immédiatement averti en cas de problème.
J'utilise pour cela le nœud "Ping" disponible sur le portail de Node-Red. Ce nœud peut s'installer très rapidement au travers de la commande suivante:

$ npm install node-red-node-ping

Il est aussi possible d'utiliser le plugin Ping Advanced, plus riche en fonctionnalités, mais mis à jour il y a plus d'un an.

• Première étape, le serveur ping l'ensemble des objets et le DNS de Google pour s'assurer de la connectivité à Internet.
• Seconde étape, si un ping échoue et retourne "false", je construis un SMS et un email que j'envoie dans une limite de 5 messages par heure et 10 par jour.

Pour l'envoi du SMS, j'utilise le flow Node-Red précédemment décrit sur ce blog.

Voici le flow en détail pouvant être directement importé dans Node-Red via la fonction d'import disponible dans le menu de l'application :

[
  {
    "id": "9eb4b49c.614b48",
    "type": "ping",
    "name": "Check Internet",
    "host": "8.8.8.8",
    "timer": "60",
    "x": 114,
    "y": 74,
    "z": "38ba78b3.c74588",
    "wires": [
      [
        "12de3311.ed21cd"
      ]
    ]
  },
  {
    "id": "ebb458eb.144ba8",
    "type": "ping",
    "name": "Check Karotz",
    "host": "192.168.1.6",
    "timer": "60",
    "x": 111,
    "y": 118,
    "z": "38ba78b3.c74588",
    "wires": [
      [
        "12de3311.ed21cd"
      ]
    ]
  },
  {
    "id": "59174860.a6e8b8",
    "type": "ping",
    "name": "Check Arduino",
    "host": "192.168.1.4",
    "timer": "60",
    "x": 113,
    "y": 164,
    "z": "38ba78b3.c74588",
    "wires": [
      [
        "12de3311.ed21cd"
      ]
    ]
  },
  {
    "id": "46b5d3a9.b94a2c",
    "type": "ping",
    "name": "Check Switch",
    "host": "192.168.1.1",
    "timer": "60",
    "x": 111,
    "y": 210,
    "z": "38ba78b3.c74588",
    "wires": [
      [
        "12de3311.ed21cd"
      ]
    ]
  },
  {
    "id": "9b7fa33e.64806",
    "type": "ping",
    "name": "Check Freebox",
    "host": "192.168.1.254",
    "timer": "60",
    "x": 117,
    "y": 254,
    "z": "38ba78b3.c74588",
    "wires": [
      [
        "12de3311.ed21cd"
      ]
    ]
  },
  {
    "id": "12de3311.ed21cd",
    "type": "switch",
    "name": "",
    "property": "payload",
    "rules": [
      {
        "t": "false"
      }
    ],
    "checkall": "true",
    "outputs": 1,
    "x": 402,
    "y": 150,
    "z": "38ba78b3.c74588",
    "wires": [
      [
        "feeab731.011548"
      ]
    ]
  },
  {
    "id": "feeab731.011548",
    "type": "delay",
    "name": "",
    "pauseType": "rate",
    "timeout": "1",
    "timeoutUnits": "hours",
    "rate": "5",
    "rateUnits": "hour",
    "randomFirst": "1",
    "randomLast": "5",
    "randomUnits": "seconds",
    "drop": false,
    "x": 572,
    "y": 151,
    "z": "38ba78b3.c74588",
    "wires": [
      [
        "95c19115.6a3e7"
      ]
    ]
  },
  {
    "id": "95c19115.6a3e7",
    "type": "delay",
    "name": "",
    "pauseType": "rate",
    "timeout": "4",
    "timeoutUnits": "seconds",
    "rate": "10",
    "rateUnits": "day",
    "randomFirst": "1",
    "randomLast": "5",
    "randomUnits": "seconds",
    "drop": false,
    "x": 737,
    "y": 150,
    "z": "38ba78b3.c74588",
    "wires": [
      [
        "17b9866d.e8467a"
      ]
    ]
  },
  {
    "id": "6aa677bb.955988",
    "type": "http request",
    "name": "SMS Alert Ludovic",
    "method": "GET",
    "ret": "txt",
    "url": "https://localhost:8080/api/sendsms?phone=0642340922&msg={{{payload}}}",
    "x": 1168,
    "y": 157,
    "z": "38ba78b3.c74588",
    "wires": [
      []
    ]
  },
  {
    "id": "17b9866d.e8467a",
    "type": "template",
    "name": "Ping message",
    "field": "payload",
    "format": "handlebars",
    "template": "Serveur {{topic}} indisponible ! ",
    "x": 919,
    "y": 157,
    "z": "38ba78b3.c74588",
    "wires": [
      [
        "6aa677bb.955988",
        "da3155a.f25cea8"
      ]
    ]
  },
  {
    "id": "da3155a.f25cea8",
    "type": "e-mail",
    "server": "smtp.gmail.com",
    "port": "465",
    "name": "xx",
    "dname": "Email Alert",
    "x": 1149,
    "y": 209,
    "z": "38ba78b3.c74588",
    "wires": []
  },
  {
    "id": "7490e004.8b6f2",
    "type": "comment",
    "name": "Ping toutes les 60 secondes",
    "info": "",
    "x": 157,
    "y": 30,
    "z": "38ba78b3.c74588",
    "wires": []
  },
  {
    "id": "9740b72f.68bf48",
    "type": "comment",
    "name": "Si KO",
    "info": "",
    "x": 401,
    "y": 98,
    "z": "38ba78b3.c74588",
    "wires": []
  },
  {
    "id": "cf2d3049.30d2d",
    "type": "comment",
    "name": "Anti-Spam",
    "info": "",
    "x": 559,
    "y": 95,
    "z": "38ba78b3.c74588",
    "wires": []
  },
  {
    "id": "e289635a.1d76a",
    "type": "comment",
    "name": "Construction du message",
    "info": "",
    "x": 923,
    "y": 97,
    "z": "38ba78b3.c74588",
    "wires": []
  },
  {
    "id": "ab74252b.548bd8",
    "type": "comment",
    "name": "Transmission",
    "info": "",
    "x": 1150,
    "y": 99,
    "z": "38ba78b3.c74588",
    "wires": []
  }
]

Ce flow vous permettra de vous assurer que vos objets connectés sont correctement allumés et disponibles, en cas de problème vous serez immédiatement averti par SMS et email.