Develop Reference

Switching from mqtts protocol to wss in nodeJS

I can connect to my MQTT broker, using mqtts protocol like this:
mqtt = require('mqtt')
let options = {
host: '0d9d5087c5b3492ea3d302aae8e5fd90.s2.eu.hivemq.cloud',
port: 8883,
path: '/mqtt',
clientId: 'mqttx_2d803d2743',
protocol: 'mqtts',
username: 'light29',
password: 'Mqtt29#!',
cleanSession: true,
}
// initialize the MQTT client
let client = mqtt.connect(options);
// setup the callbacks
client.on('connect', function () {
console.log('Connected');
});
client.on('error', function (error) {
console.log(error);
});
client.on('message', function (topic, message) {
// called each time a message is received
console.log('Received message:', topic, message.toString());
});
// subscribe to topic 'my/test/topic'
client.subscribe('mytest');
// publish message 'Hello' to topic 'my/test/topic'
client.publish('mytest', 'Hello');
This code, yields, as expected:
Connected
Received message: mytest Hello
Now, I would like to connect to this same broker but using wss protocol instead, thus I tried:
let options = {
host: '0d9d5087c5b3492ea3d302aae8e5fd90.s2.eu.hivemq.cloud',
port: 8884,
path: '/mqtt',
clientId: 'mqttx_2d803d2743',
protocol: 'wss',
username: 'light29',
password: 'Mqtt29#!',
cleanSession: true,
}
However, in this case, I got:
Error: connect ECONNREFUSED 127.0.0.1:8884
at TCPConnectWrap.afterConnect [as oncomplete] (node:net:1161:16) {
errno: -61,
code: 'ECONNREFUSED',
syscall: 'connect',
address: '127.0.0.1',
port: 8884
}

I have finally managed to connect with these changes:
let options = {
username: 'light29',
password: 'Mqtt29#!',
}
// initialize the MQTT client
let client = mqtt.connect('wss://0d9d5087c5b3492ea3d302aae8e5fd90.s2.eu.hivemq.cloud:8884/mqtt', options);
Still, I do not know why explicitly passing protocol, host, port and path does solve it.

The problem in the original is that protocol in the options should be schema and should container URL schema e.g.
let options = {
host: '0d9d5087c5b3492ea3d302aae8e5fd90.s2.eu.hivemq.cloud',
port: 8883,
path: '/mqtt',
clientId: 'mqttx_2d803d2743',
schema: 'mqtts://',
username: 'light29',
password: 'Mqtt29#!',
cleanSession: true,
}
or
let options = {
host: '0d9d5087c5b3492ea3d302aae8e5fd90.s2.eu.hivemq.cloud',
port: 8883,
path: '/mqtt',
clientId: 'mqttx_2d803d2743',
schema: 'wss://',
username: 'light29',
password: 'Mqtt29#!',
cleanSession: true,
}
protocol is not a valid option.

Nodemailer error (Error: queryA EREFUSED)

sorry for my english
I am using nodemailer and when querying through the api it gives this error:
Error: queryA EREFUSED smtp.gmail.com
at QueryReqWrap.onresolve [as oncomplete] (dns.js:210:19) {
errno: undefined,
code: 'EDNS',
syscall: 'queryA',
hostname: 'smtp.gmail.com',
command: 'CONN'
}
My code:
this.transporter = nodemailer.createTransport({
service: 'gmail'
auth: {
user: mygmail#gmail.com,
pass: mypass,
},
})
UPD: I connected the phone to the Internet instead of my LAN cable, checked, everything worked. There was no error, I connected the LAN back, disconnected the phone, this error appeared again

Make sure that Less secure app access is on in your Gmail account:
Less secure app access > ON
Then fix your code:
this.transporter = nodemailer.createTransport({
service: "gmail",
auth: {
user: email,
pass: password
}
});

You can use the built-in service in the Nodemailer and make your code simpler with this one.
this.transporter = nodemailer.createTransport({
service: 'gmail',
auth: {
user: mygmail#gmail.com,
pass: mypass,
},
})
Please make sure you have disabled 2-Step verification.

How to pass connection options like username and password in mqtt

I am getting failed: Error during WebSocket handshake: net:: ERR_CONNECTION_RESET this error when I fixed mqttprops.
I tried using these props
mqttProps: {
host: "157.245.85.49:8084/mqtt",
username: "tolomoto",
password: "S36EeqD956UwGCYC",
},
or
mqttProps: {
protocol: "wss",
host: "wss://157.245.85.49:8084/mqtt",
port: "8084",
username: "tolomoto",
password: "S36EeqD956UwGCYC",
},
or
mqttProps: "ws://157.245.85.49:8084/mqtt"
or
mqttProps: "ws://tolomoto:S36EeqD956UwGCYC#157.245.85.49:8084/mqtt
Please tell me how to solve it.

Error: connect ECONNREFUSED 127.0.0.1:465 send mail

I use the email account of my site contact#monsite.com to send smtp alert messages to the email of my users. but it still gives me this error
Error: connect ECONNREFUSED 127.0.0.1:465
at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1137:16) {
errno: 'ECONNREFUSED',
code: 'ESOCKET',
syscall: 'connect',
address: '127.0.0.1',
port: 465,
command: 'CONN'
}
here is my code
// send mail function
exports.sendMailer = (optionsTransporterMail = OptionsTransporterMail, optionsMail = OptionsMail, callback) => {
const nodemailer = require('nodemailer');
let transporter = nodemailer.createTransport(optionsTransporterMail);
transporter.sendMail(optionsMail, function (err, info) {
callback(err, info)
});
}
sendMailer({
service: 'mail.mywebsite.com',
port: 465,
secure: true,
auth: {
user: 'contact#mywebsite.com',
pass: '12345678'
}
}, {
from: '"My app <contact#mywebsite.com>',
to: user#domain.com,
subject: "Notify",
text: "Hello worlds",
html: "Hello worlds"
}, (err, info) => {
if err console.log(err);
console.log(info)
})
it still gives this error
Error: connect ECONNREFUSED 127.0.0.1:465
at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1137:16) {
errno: 'ECONNREFUSED',
code: 'ESOCKET',
syscall: 'connect',
address: '127.0.0.1',
port: 465,
command: 'CONN'
}

I assume you want to use mail.mywebsite.com in order to send an email. In those terms, you have to set up host value in options, because it seems like by default it uses localhost (127.0.0.1).
Please try the following code:
sendMailer({
host: 'mail.mywebsite.com',
port: 465,
secure: true,
auth: {
user: 'contact#mywebsite.com',
pass: '12345678'
}
}, {
from: '"My app <contact#mywebsite.com>',
to: user#domain.com,
subject: "Notify",
text: "Hello worlds",
html: "Hello worlds"
}, (err, info) => {
if err console.log(err);
console.log(info)
})

Nodemailer was sending mails but then it suddenly stopped, now it's giving me this error

This worked like some days ago but then it stopped. I really don't know what's going on. PS: I am on a Mac and it does not look like it's a firewall issue.
exports.sendEmail = (recipient, subject) => {
const mailTransporter = nodeMailer.createTransport({
service: 'gmail',
host: 'smtp.gmail.com',
port: 465,
secure: true,
auth: {
user: process.env.EMAIL_USER,
pass: process.env.EMAIL_PASS
}
})
const mailOptions = {
from: process.env.EMAIL_USER,
to: recipient,
subject,
html: htmlTemplate(generatePasswordResetLink(),recipient),
}
return mailTransporter.sendMail(mailOptions, (error, success) => {
if (error) {
console.log(error);
return error;
}
return success;
})
The console.log(error); in the code spits this
{ Error: connect ECONNREFUSED 74.125.133.109:465
at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1097:14)
errno: 'ECONNREFUSED',
code: 'ESOCKET',
syscall: 'connect',
address: '74.125.133.109',
port: 465,
command: 'CONN' }
And I have tried like everything possible to get it to work. I have also restarted my laptop.
PS:
user: 'a valid gmail account',
pass: 'correct pass for the account'