101-air-quality-sensor-text-messaging-twilio

ESP8266 over the Web: Getting started with IoT System Architecture

Project Goal

The use scenario of this project.

• Send an alert message by SMS when the air quality is not good
• Understanding Devify

This project shows how to extend devify-server biolerplate to send an alert SMS. Please read Devify to understand Devify in a bit before continue to this project.

Prerequisites

0. Understanding 101-air-quality-sensor-console-print

1. This project uses twilio APIs for text messaging. Please signup and get your own credentials at twilio.

2. This project uses twilio npm module to invoke twilio REST APIs. Please run $ npm install twilio to install the latest version.

3. Please copy config.json.example to config.json.

Getting Started

Twilio credentials consists of Sid and Token. Please open config.json and put on your credentials.

var server = require('devify-server').coapBroker;

// Twilio Credentials 
// Sendgrid credentials.
var fs = require('fs');
var app = JSON.parse(fs.readFileSync(__dirname + '/config.json'));
 
//require the Twilio module and create a REST client 
var client = require('twilio')(app.accountSid, app.authToken); 

var sms = 0;

// override '.onData()' event handler
var sms = function(message) {
	var obj = JSON.parse(message.data);

	if (obj.quality >= 350) {
		client.messages.create({ 
			to: "<TO-PHONE-NUMBER>", 
			from: "<FROM-PHONE-NUMBER>", 
			body: "The air is too bad: " + obj.quality,   
		}, function(err, result) { 
			console.log(result.sid); 
		});
	}
}

server.start({
	onmessage: sms
});

NodeMCU

The full source list is as the following.

-- Configure the ESP as a station (client)
wifi.setmode(wifi.STATION)  
wifi.sta.config("<SSID>", "<PASSWORD>")  
wifi.sta.autoconnect(1)

-- Create a CoAP client
cc = coap.Client()

-- Make a POST request
uri="coap://192.168.0.100:8000/object/12345678/send"

-- Setup a timer to send ADC data
tmr.alarm(0, 8000, 1, function() 
    buf = 
          "{" ..
          "\"quality\":" ..
          adc.read(0) ..
          "}"
    
    cc:post(uri, buf)
    print(buf)
end)

The work of modifying the code is just the same with the chapter 101-air-quality-sensor-console-print.

Please read Quickstart to run this project.

Next

• 102-air-quality-sensor-email