The stopAlarm function will reset the currentState of the alarm depending on the recurring variable. This function executes the executeCallCycle function and will set the currentState of the alarm to ’on’. The second parameter of the scheduleJob function will be a function that will be triggered whenever the job gets triggered. This alarmTime variable will then be plugged into the scheduleJob function. You’ll use a recurrence rule to create an alarm in the testing section. The createAlarm function takes in an alarmTime parameter which can be a string in cron format, a JavaScript date, or as a recurrence rule which specifies when the job should recur.
For this tutorial, you’ll set this limit to 5 calls. However, since you are dealing with phone calls, you’ll want to set a limit on how many times a user can receive a call so you don’t get flagged by carriers, rack up unnecessary charges, or end up in an infinite call loop. This set interval will be your snooze interval and you’ll want to set it to 9 minutes.Īlmost all alarms will allow you to snooze infinitely until you stop it. This cycle will repeatedly call the user at a set interval a set amount of times.
Once the alarm function is triggered, a call cycle will be triggered to call the user. This package allows you to execute functions at specific times with optional recurrence rules. The alarms will be created and triggered by a Cron job using the Node Schedule package. So before you dive into the tutorial, let’s take a look at how this service will work.
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ngrok installation - Download ngrok hereĪt first glance, the components to any alarm may seem simple, but when creating an automated alarm service there are many components to think about, such as the alarm trigger, snooze button, the snooze interval time, how to stop the alarm, and how to deal with different time zones.Node.js installation - Download Node.js here.A Twilio number - Read our docs here on how to obtain a Twilio number.
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The second part will focus on handling multiple alarms for multiple users using MongoDB. This first part of the tutorial will focus on creating and triggering the alarm through a Cron job and Twilio Programmable Voice. Although most smartphones nowadays have built-in alarms, the tradition and charm of this service is still used by most hotels, which made me want to build an automated wake-up call service with Twilio Programmable Voice. Previously, I built a Shazam-like service that identifies songs using Twilio and it piqued my interest in exploring what other services could be emulated using Twilio.Ĭonsequently, a wake-up call service came to mind. If you aren’t familiar with a wake-up call service, it's as literal as it sounds it’s a telephone call service, typically provided by hotels, intended to wake you up at a specified time.
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