on¶

Synopsis¶

on(type: string, ...): self

Parameters¶

The caller will receive specific alert data type depending on the type of alert. For example, a “heartbeat” alert will provide a serial number string. And an “alert” event will provide a Json object keyed with the alert properties. See below for the alert types.

Event	Description	Data
heartbeat	A LinQ Network Device will generate a heartbeat every 5-10 seconds when connected to a LinQ Network Service.	serial: string
alert	A LinQ Network Device will generate asyncrounous alerts dependent on external triggers detected by the LinQ Network Device. On such a trigger the “alert” event is generated.	alertData: { serial: string, who: string, what: string, when: string, where: string, message: string, }
erro	The LinQ Network Library will generate an alert error when an exception occurs during runtime.	error: string

Example¶

Listen to heartbeats and alerts. Print serial numbers and alerts to console.

let netw = require("@altronix/linq-network-js").default;

netw.listen("tcp://*:33455");
netw
  .on("heartbeat", sid =>
    netw
      .send(sid, "GET", "/ATX/about")
      .then(response => console.log("Response: %s", response))
      .catch(e => console.log(e))
  )
  .on("alert", alert_data => {
    console.log("ALERT from [%s]", alert_data.serial);
    console.log("ALERT who [%s]", alert_data.who);
    console.log("ALERT what [%s]", alert_data.what);
    console.log("ALERT where [%s]", alert_data.where);
    console.log("ALERT when [%s]", alert_data.when);
    console.log("ALERT mesg [%s]", alert_data.mesg);
  });
netw.run(50);