MQTT mosquito | A number of IoT platforms (2023)


Know and understand the MQTT protocol. Then deploy and create the project to register and publish to the public server.

What is MQTT?

​MQTT stands for Message-Queue-Telemetry-Transport, i.e.publish/subscribeprotocol formachine to machineContact. This simple protocol is easy for any client to implement. is called asThe barifault,both are used for the same purpose but with different methods.

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MQTT mosquito | A number of IoT platforms (1)

Start of work

There are 2 sections here -Publish and register. And then there is the intermediary -Hall. Let's look deeper

- IoT devices have the function of collecting sensor data and sending it to the cloud (broker). Whilepersonal computer / server / Mobile devicesPlay the role of monitoring and receiving sensor data to display - Here,IoT devicethat's oneEditor, icomputing devicesesSubscriber.MQTT mosquito | A number of IoT platforms (2)

[EXAMPLE] When auser 1post a photo on social media and then justuser 2registereduser 1can see/receive the image. Here,user 1EsEDITOR,user 2EsSUBSCRIBER, iuser accountEsMEDIATOR.

- According to the previous analogy, the image that is published is data, that is,transfer from user 1 to user 2?. And this is the exact scenario in the MQTT Pub/Sub model.

MQTT mosquito | A number of IoT platforms (3)

- Do we have a safer level? to ensure data exchangethrough a certain path, we call that "subject", When wees1 publishes subject data, the subscriber receives automatically if he is already connected to the broker. Therefore,tuand LOW latency.

MQTT intermediary

Whenever the pub-sub model is used as the messaging protocol, we need a broker that can transfer the information to the requested device. This can be done by sending a message to the correct subject.

To clear things up -

- Broker is a runtime server (continuously running service), which can have 2 types of clients -Publisher (seller)iSubscriber (client)- For example, when the sellersell the productthrough the broker to the buyer, then uses the broker's service to reach and find a safe buyer.- Similarly, when the publisher publishes information, the data reaches the subscriber through the broker.MQTT mosquito | A number of IoT platforms (4)- The broker is responsible for having a specific storage space where it can wait for the data from the publisher to be cached and then sent to the subscriber. - In pub-sub MQTT, clients communicate with each other through an MQTT broker. - There are many MQTT brokers on the market. It is even possible to create your own broker or use an open source broker.relay“.- For the current project, we will first understand the mechanism and then follow the movement of the test dataBroker Mosquitto MQTT.

mosquito platform

Now that we understand how MQTT works, let's use the MQTT cloud service and send data over the Internet. In this article we will use Mosquitto MQTT

MQTT mosquito | A number of IoT platforms (5)

In the Server section we can see different ports that provide servers separated by attributes. These servers act as channels for sharing data through the cloud. Let's clear this up first -

- Puerto Broker MQTT (zadano: 1883):This is the standard port used for MQTT communication. MQTT clients are also used to connect to the Mosquitto broker and post/subscribe to topics. It works over TCP.- Puerto MQTT Broker SSL/TLS (zadano: 8883):This is a secure version of the MQTT port broker. It uses SSL/TLS encryption for secure communication between MQTT clients and the Mosquitto broker. Clients connect to this port to establish a secure connection.- WebSocket Port (default: 9001):Mosquitto also supports MQTT over WebSockets, allowing MQTT clients to connect to the broker using the WebSocket protocol. The WebSocket port is used for WebSocket-based MQTT communication.- Puerto WebSocket SSL/TLS (zadano: 9443):This is a secure WebSocket port used for encrypted WebSocket-based MQTT communication. It provides a secure connection using SSL/TLS encryption.

we will use each otherin 1883Port for sending data and monitoring. As we know, MQTT has 3 services: Publisher, Broker and Subscriber. In this case, MQTT Cloud mosquito already plays the role of intermediary.

Now we would useESP32 development board, which has a wifi chip and can connect to the Internet by playingthe role of the publisherto share temperature and humidity data from sensors.

On the other hand, we will use a computer to view this data asSubscriber.This will allow us to fully understand the working principle of the MQTT protocol used in IoT communication between devices.

Editor (ESP32)

To configure ESP32 for MQTT, we need to install the library: PubSubClient. This library has functions that use the variables listed below to send data to the broker.

mqtt_server: This variable represents the address or IP of the MQTT broker. We will use "" mqtt_port: This variable represents the port number of the MQTT broker. In our case 1883.mqtt_topic: This variable represents the topic to which the editor will send messages. For example, "schoolofiot/device1". wherea collegiate' is the most general level of questioning. and 'device 1'is a sublevel.

The code provided is an Arduino sketch that uses an ESP32 WiFi module and the PubSubClient library to connect to an MQTT broker and publish temperature and humidity data. Let's break down the code step by step:

1. Include the required libraries:



This code includes the libraries needed for the ESP32 WiFi module and MQTT client functionality.

2. Set the WiFi and MQTT server variables:

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const char* ssid = "XXXXXXXXX";const char* κωδικός = "XXXXXXXXXX";const char* mqtt_server = "";

These variables store the SSID (network name) and password of the WiFi network you want to connect to. The mqtt_server variable contains the IP address or hostname of the MQTT broker.\

3. Declare global variables and objects:


WiFiClient espClient;PubSubClient-client(espClient);long lastMsg = 0;char msg[50];int value = 0;surf temp = 0; vlaga plovka = 0;

The WiFi client object (espClient) and the MQTT client object (client) are declared here. The lastMsg variable stores the timestamp of the last message, and msg is a string to store messages. The value, temperature and humidity variables are used to store the corresponding sensor values.

4. Installation method:


void setup() { Serial.begin(115200); wifi_configuration(); client.setServer(mqtt_server, 1883); client.setCallback(callback);}

The setup() function is called once at the beginning of the program. Initializes serial communication, establishes a WiFi connection, configures the MQTT server and port, and sets up a callback function to process incoming messages.

5. WiFi configuration method:


void setup_wifi() { // ...}

The setup_wifi() function handles connecting to a WiFi network using the supplied SSID and password. Wait for the connection to be established and print the local IP address on the serial screen.

6. MQTT callback function:


void povratni poziv(char* subject, byte* message, unsigned length) { // ...}
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This function is called when a message is received from the MQTT broker. Prints the received message along with the corresponding subject.

7. MQTT reconnection method:


abort reconnect() { // ...}

The reconnect() function is responsible for reconnecting to the MQTT broker if the connection is lost. It tries to connect to the broker using a randomly generated client ID. If the connection is successful, a success message is printed. Otherwise, wait 5 seconds before trying again.

8. Main loop:


void loop() { if (!client.connected()) { reconnect(); } client.loop(); time now = milliseconds(); if (now - lastMessage > 2000) { lastMessage = now; send data(); }}

The loop() function is the main loop of the program that runs continuously after the setup() function. Checks if the MQTT client is connected, and if not, tries to connect again. It also calls the client.loop() function to maintain the internal state of the MQTT client. Call the sendData() function every 2 seconds to post temperature and humidity data.

9. Method of posting sensor data:


void sendData() {// ...}

The sendData() function is responsible for posting temperature and humidity data to specific MQTT topics. It generates random temperature and humidity values, converts them to strings, and publishes them along with the corresponding topic.

- Send an empty message:


client.publish("schoolofiot/gap", "---------------");
(Video) IoT Basics - MQTT

This line publishes a message consisting of a string of dashes (--------------) to the MQTT topic "schoolofiot/gap". It is used to indicate a separation or gap between different data sets.

- Read and publish temperature data:


temp = nasumično(30, 40); char tempString[8]; dtostrf(temp, 1, 2, cadena temporal); Serial.print("Temp: ");Serial.println(tempString); String tempdata = "Temperatura: " + String(tempString);client.publish("schoolofiot/temperature", tempdata.c_str());

These lines generate a random temperature value between 30 and 40 degrees, store it in the temperature variable, and use the dtostrf() function to convert the decimal data to a string.


dtostrf(floatValue, minStringWidth, numAfterDecimal, charBuf_to_store_string);

This function takes four parameters to convert a double to an ASCII value stored in an array:
1. floatValue: The first parameter that takes a float value that we want to convert to a string.
2. minStringWidth – This is the second parameter that sets the minimum width of the output string field.
3. numAfterDecimal: The third parameter is the precision that describes the number of digits after the decimal point.
4. charBuffer - The last argument is where the string will be stored. This is a type of fixed-size character array.

The temperature value is then printed to the serial screen and concatenated with the string "Temperature:". The resulting string is stored in the tempdata variable. Finally, the tempdata array is published to the schoolofiot/temperature MQTT topic using the client.publish() function.

- Read and publish humidity data:


vlažnost = random(60, 70);char humString[8];dtostrf(humedad, 1, 2, humString);Serial.print("Vlažnost:");Serial.println(humString);String humdata = "Υγρασία: " + String(humString);client.publish("schoolofiot/humedad", humdata.c_str());

These lines generate a random humidity value between 60 and 70 percent, they store it in the humidity variable.

In general, the sendData() function generates random temperature and humidity values, converts them to strings, and posts them to specific MQTT topics for further processing or monitoring.

You can find the final code in the Code section

But to confirm this, we also need to read the data from the other side: the Subscriber.

Subscriber (Windows PC)

To install the Subscriber on the computer, it is necessary to install the Mosquitto MQTT application. This app can create brokers, publishers and subscribers, all modules.

To install Mosquitto MQTT on your computer from the official website and make changes to the configuration file for the 1883 listener and enable anonymous connections, you can follow these steps:

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1. Download and install Mosquitto:

Go to the official Mosquitto website ( Go to the Downloads section. Select the appropriate installer for your operating system (in this case Windows x64) and download it. Install the app in the desired location.

2. Edit the configuration file:

Open the installation directory where Mosquitto is installed. Locate the mosquitto.conf file (usually located in the main directory). Open mosquitto.conf in a text editor of your choice.
Add the following 2 lines:


listener 1883allow_anonymous true

It should look like this: We can uncomment the ad to make changes to the file, but adding just 2 lines at the top is simpler and more noticeable.

3. Pokrenite Mosquitto Subscriber

We can start the Mosquitto runner and then subscribe to whatever topic we want. But direct subscriber execution is better in our case. Open the folder/directory where mosquitto.exe along with mosquitto_sub.exe is located. Launch a PowerShell/CMD terminal from the directory. For Windows, open the directory > press shift + right mouse button (right click) and we'll see options to launch a terminal like powershell. In the terminal, type the following command:


> .mosquitto_sub -h -t "schoolfiot/#"

In the above command, if you noticed, I didn't write any specific topic. According to topics that we have published (from ESP32), such as "scoliofiot/gap", "scoliofiot/temperature" or "scoliofiot/humidity".

The reason is that the difference in elevation, temperature and humidity fall under the general theme of "school level". So, to access/view data posted as a sublevel of schoolofiot, we can use '#'. Also, in case we need to log a specific issue (like temperature), we can use a command like this


> .mosquitto_sub -h -t "schoolfiot/temperature"

So whatever name you put under the general theme, we can subscribe and see it all together.


We learned another IoT platform - Mosquitto MQTT (by Eclipse)


#include#include// Replace the following variables with the SSID/password combination const char* ssid = "XXXXXXXXX";const char* password = "XXXXXXXXXXX";// Add the IP address of the MQTT broker address, example: const char* mqtt_server = "" ;WiFiClient espClient;PubSubClient client(espClient);long lastMsg = 0;char msg[50];int value = 0;float temperature = 0;float humidity = 0;void setup() { Serial. begin(115200); // default setup setup_wifi(); client.setServer(mqtt_server, 1883); client.setCallback(callback);}void setup_wifi() { delay(10); // We start by connecting to the WiFi Serial.println(); Serial.print("Connecting to "); Serial. println(ssid); WiFi.begin(ssid, password); while (WiFi.status() != WL_CONNECTED) { delay(500); Serial.print("."); } Serial.println(""); Serial.println("WiFi connected"); Serial.println("IP Address: "); Serial.println(WiFi.localIP());}void callback(char* subject, byte* message, length unsigned int) { Serial.print("Message reached subject: "); Serial.print(subject); Serial.print(". Message: "); String messageTemp; for(int i = 0; i2000) { lastMessage = now; Serial.println(client.connected()); send data(); }}void sendData(){ Serial.println(); client.publish("schoolofiot/gap", "--------------"); //Read temperature temp = random(30,40); char TimeString[8]; dtostrf(temp, 1, 2, temporary string); Serial.print("Temperature: "); Serial. println(tempString); String tempdata = "Temp: " + String(tempString); client.publish("schoolofiot/temperature", tempdata.c_str()); //Read humidity humidity = random(60,70); char humString[8]; dtostrf(humidity, 1, 2, humString); Serial.print("Humidity: "); Serial. println(humString); String humdata = "Humidity: " + String(humString); client.publish("schoolofiot/humidity", humdata.c_str()); }


MQTT mosquito | A number of IoT platforms? ›

Beyond 1 Million Connected and Active Devices over MQTT.

How many devices use MQTT? ›

Beyond 1 Million Connected and Active Devices over MQTT.

How many connections can Mosquitto handle? ›

Regardless, since mosquitto is single-threaded, we have not found it useable for anything more than about 1000 publisher clients with a reasonable payload rate at 1 / 10 seconds.

What are the limitations of Mosquitto MQTT? ›

The MQTT protocol allows messages with a maximum size of 268435455 bytes approx 260MB. This is obviously a very large message size and one that most brokers,especially public brokers, will restrict.

How many clients can Mosquitto broker handle? ›

Each one will handle 10-20 clients. As far as I understand a common solution is MQTT. The clients periodically send data to the broker (i.e. Mosquitto running on the hosting server), that in turn updates the main web app that runs on the same server.

Is MQTT obsolete? ›

MQTT was previously known as the SCADA protocol, MQ Integrator SCADA Device Protocol (MQIsdp), and WebSphere MQTT (WMQTT), albeit all of these names, have since become obsolete.

Is MQTT still being used? ›

Although MQTT started as a proprietary protocol used to communicate with supervisory control and data acquisition (SCADA) systems in the oil and gas industry, it has become popular in the smart device arena and today is the leading open source protocol for connecting internet of things (IoT) and industrial IoT (IIoT) ...

What is the maximum number of simultaneous client connections? ›

By default, SQL Server allows a maximum of 32767 concurrent connections which is the maximum number of users that can simultaneously log in to the SQL server instance.

What is the maximum size of MQTT in IoT core? ›

The maximum MQTT payload in AWS IoT Core is only 128kB. The payload for every publish request is limited to 128 KB. The AWS IoT service rejects publish and connect requests larger than this size. Why is there an option in the nucleus component which says "maxMessageSizeInBytes" which can be increased to 2.5MB.

How many topics can MQTT handle? ›

The length of the actual topic string is at most 65536 bytes. This is a limit imposed by the mqtt spec, you can't change it. It is also worth noting that the topic is encoded with utf-8, so you may have less than 65536 characters available. The payload of the message is limited to 268,435,456 bytes.

What is the downside of MQTT? ›

Another disadvantage of MQTT is that it has limited features and standardization. The protocol is designed to be simple and lightweight, which means that it does not support some advanced features that may be useful for some IoT applications, such as message acknowledgement, message ordering, or message expiration.

What are the drawbacks of MQTT? ›

One of the disadvantages of MQTT protocol is its lack of native support for data formats and semantics. MQTT messages are binary blobs that can contain any type of data, but the protocol does not specify how to encode, decode, or interpret the data.

What is the difference between MQTT and Mosquitto? ›

Message Queuing Telemetry Transport (MQTT) is a standard protocol. Mosquitto is a bridge which connects to other MQTT based messaging servers. Bridge has features of passing MQTT messages from source to destination.

Which is the most scalable MQTT broker? ›

EMQX is currently the most scalable MQTT broker for IoT applications. It processes millions of MQTT messages in a second with sub-millisecond latency and allows messaging among more than 100 million clients within a single cluster.

What is the maximum payload size in Mosquitto? ›

The MQTT protocol itself defines a MQTT PUBLISH payload size limit of 256MB.

Which is the most used MQTT broker? ›

Compare the Top MQTT Brokers of 2023
  • EMQX. EMQ Technologies. EMQX is the world's most scalable and reliable MQTT messaging platform designed by EMQ. ...
  • FactoryStudio. Tatsoft. ...
  • HiveMQ. HiveMQ. ...
  • Open Automation Software. Open Automation Software. ...
  • Redis. Redis Labs. ...
  • RabbitMQ. RabbitMQ. ...
  • Eclipse Mosquitto. Cedalo. ...
  • MQTTRoute. Bevywise Networks.

Can Kafka replace MQTT? ›

MQTT is ideal for low-bandwidth networks and connecting a vast number of devices, while Kafka is perfect for large-scale applications requiring real-time storage of data and processing by third-party data applications. Combining MQTT and Kafka can provide numerous benefits for IoT data processing.

Is MQTT best for IoT? ›

MQTT is hands down the best messaging technology to deploy for your IoT network. It is low cost, fast, lightweight, and scalable. It has its security issues, but a tie-up with a reliable cellular partner can ensure your IoT network uses MQTT securely and without any hassle.

Is MQTT faster than rest? ›

As per the analysis and test reports, MQTT data transfer can transfer data at a rate 20 to 25 times faster than REST Calls. The number of message transaction highly depends on the number of connections the server can accept in the stipulated time.

Does Tesla use MQTT? ›

The MQTT function within TeslaMate allows useful values to be published to an MQTT broker. This is useful in allowing other automation platforms to consume data from TeslaMate.

Does AWS use MQTT? ›

AWS IoT Greengrass provides options for you to choose which local MQTT broker to run on your core devices. Client devices connect to the MQTT broker that runs on a core device, so choose an MQTT broker that is compatible with the client devices that you want to connect.

What is the alternative to MQTT in IoT? ›

RabbitMQ, REST, XMPP, Google Cloud Messaging, and Kafka are the most popular alternatives and competitors to MQTT.

How many clients can a single server handle? ›

For example, a web server running on a single core processor with 1GB of RAM can handle up to 200 concurrent users, while a web server running on a multi-core processor with 8GB of RAM can handle up to 8,000 concurrent users.

What is the maximum number of ports per server? ›

On the TCP level the tuple (source ip, source port, destination ip, destination port) must be unique for each simultaneous connection. That means a single client cannot open more than 65535 simultaneous connections to a single server. But a server can (theoretically) serve 65535 simultaneous connections per client.

How many clients can connect to the same port? ›

There is a '64K' limit that is often cited, but that is per client per server port, and needs clarifying. If a client has many connections to the same port on the same destination, then three of those fields will be the same — only source_port varies to differentiate the different connections.

Why is MQTT most preferred protocol in IoT? ›

Smart sensors, wearables, and other Internet of Things (IoT) devices typically have to transmit and receive data over a resource-constrained network with limited bandwidth. These IoT devices use MQTT for data transmission, as it is easy to implement and can communicate IoT data efficiently.

What is the payload size of Mosquitto MQTT? ›

Maximum message payload size

Important: The maximum payload size on Platform Service is 131072 bytes. Messages with a payload that is greater than the limit are rejected.

Is MQTT full duplex? ›

MQTT is standard publish/subscribe protocol which is used by embedded devices. It is also used as common M2M interactions. In this device connection is maintained and it uses full duplex TCP connection.

What is the size limit for MQTT in AWS? ›

MQTT and HTTP messaging pricing

You can send and receive messages up to 128 KB in size. Messages are metered in 5 KB increments.

What is the maximum data size in MQTT? ›

The maximum packet size is 256MB. Small packets less than 127 bytes have a 1 byte packet length field. Packets larger than 127 and less than 16383 will use 2 bytes.

How many layers are there in MQTT? ›

7Application LayerMQTT Protocol
4Transport LayerTCP (RFC 793)
3Network LayerIP (RFC 791)
2Link LayerIP (RFC 894)
1Physical LayerEthernet (IEEE 802.3)
2 more rows

Why use MQTT over WebSockets? ›

MQTT is suitable for low-powered devices with limited CPU and memory, and unreliable, low-bandwidth networks. It's the go-to protocol for IoT use cases. WebSockets are suitable for web apps and devices unrestricted (or less restricted) by low bandwidth.

Is MQTT used in industry? ›

The main reason why is MQTT's open-source design and lightweight stature make it well suited to connect disparate devices to supervisory control and data acquisition (SCADA) systems as well as other industrial networks.

Does MQTT work over WiFi? ›

MQTT allows the complete line of NCD WiFi sensors to communicate via the internet to any MQTT Broker service using a WiFi connection. It only requires network connection credentials, connection information about the MQTT Host Broker, and authentication information for the MQTT connection if applicable.

Is MQTT high latency? ›

MQTT is an OASIS standard for IoT connectivity. It is a publish/subscribe, extremely simple and lightweight messaging protocol, designed for constrained devices and low-bandwidth, high-latency or unreliable networks.

Is MQTT good for real time? ›

It can provide real-time reliable messaging services for network-connected devices with minimal code. MQTT protocol is widely used in IoT, Mobile Internet, Smart Hardware, Internet of Vehicles, Smart Cities, Telemedicine, Power, Oil, Energy, and other fields.

Does MQTT need a server? ›

MQTT is a publish-and-subscribe protocol, meaning that instead of communicating with a server, client devices and applications publish and subscribe to topics handled by a broker.

What is the fastest MQTT server? ›

Mosquitto is the fastest MQTT server available today when run as just a message broker.

Does Kafka use MQTT? ›

Use the HiveMQ Kafka extension,which implements the native Kafka protocol inside the HiveMQ MQTT broker, to forward the MQTT messages to the Kafka cluster on Confluent Cloud. There it will be made available for consumption by a large number of enterprise applications.

What language is MQTT written in? ›

The Secure MQTT Broker is written in C & Python and works with all standard MQTT Clients.

Can I build my own MQTT broker? ›

You can install an MQTT broker on your own server hardware including a raspberry Pi. There are many brokers/servers to choose from, and most are free and open source. Each of these brokers will have their own requirements e.g Aedes (formally Mosca) is a Node.

Is MQTT more secure than https? ›

MQTT relies on TCP/IP standards, just like HTTP. TLS encryption, the successor to the Secure Sockets Layer (SSL), provides even more security. In this way, one can send information/data over encrypted pipes.

Which MQTT is best for Python? ›

paho-mqtt. paho-mqtt is arguably the best of the Python MQTT open-source client libraries. It was developed under the leadership of the Eclipse Foundation, and besides the Python library, it also supports major programming languages such as C++, Java, JavaScript, Golang, etc.

What is the maximum message size in IoT? ›

Device-to-cloud messages can be up to 256 KB; cloud-to-device messages can be up to 64 KB. These are the maximum message sizes for each type of message.

How fast is MQTT? ›

The real advantage of MQTT over HTTP occurs when we reuse the single connection for sending multiple messages in which the average response per message converges to around 40 ms and the data amount per message converges to around 400 bytes.

What is the payload size of MQTT in Arduino? ›

By default, it is set to 256 bytes - as defined by the MQTT_MAX_MESSAGE_SIZE constant in PubSubClient.

Is Raspberry Pi a MQTT broker? ›

You can use MQTT for having multiple sensors to send their data to your Raspberry Pi's MQTT broker, which client devices can then receive that data. If you want to learn more about the MQTT protocol and why it is excellent for IoT devices such as the Raspberry Pi, be sure to check out the official MQTT website.

How many clients does MQTT have? ›

MQTT Engine has two potential client connections. One will publish the v3. 0.0 Sparkplug™ B STATE message which will be initiated by default. A second optional client is available to publish the legacy Sparkplug™ B STATE message and is disabled by default.

What devices use MQTT? ›

Smart homes and wearable devices

MQTT is used for communication between many consumer IoT devices. This could include everything from smart home devices like thermostats, appliances, or security systems as well as wearable devices like smart watches, fitness trackers, health monitoring tools, or your smartphone.

How popular is MQTT? ›

MQTT Widely Used Today in IIoT

When asked 'What protocols do you use today to connect your equipment? ', the most popular was HTTP (55.4%), followed by MQTT (50.3%) and then Modbus (45.9%).

Who uses MQTT? ›

MQTT is now used in many industries, including automobile, industrial, communications, oil and gas, and so on. Message Queuing Telemetry Transport is suitable for machine-to-machine (M2M) communications because of its optimization for low-bandwidth and high-latency environments.

Can MQTT have multiple subscribers? ›

Yes. AWS IoT uses MQTT, which follows a topic-based publish-subscribe pattern. This allows multiple subscribers to a topic, and multiple clients can even publish to the same topic (a topic is not specifically designated for one client to publish or subscribe to).

What are the disadvantages of MQTT? ›

One of the disadvantages of MQTT protocol is its lack of native support for data formats and semantics. MQTT messages are binary blobs that can contain any type of data, but the protocol does not specify how to encode, decode, or interpret the data.

What are competitors to MQTT? ›

RabbitMQ, REST, XMPP, Google Cloud Messaging, and Kafka are the most popular alternatives and competitors to MQTT.

What is the most used MQTT? ›

EMQ X is currently the most scalable MQTT broker for IoT applications. It processes millions of MQTT messages in a second with sub-millisecond latency and allows messaging among more than 100 million clients within a single cluster.

Is MQTT only for IoT? ›

MQTT is a standards-based messaging protocol, or set of rules, used for machine-to-machine communication. Smart sensors, wearables, and other Internet of Things (IoT) devices typically have to transmit and receive data over a resource-constrained network with limited bandwidth.

Is MQTT an IoT platform? ›

MQTT is an OASIS standard messaging protocol for the Internet of Things (IoT). It is designed as an extremely lightweight publish/subscribe messaging transport that is ideal for connecting remote devices with a small code footprint and minimal network bandwidth.

What language does MQTT use? ›

HiveMQ MQTT Client is a Java-based MQTT client implementation compatible with MQTT 3.1. 1 and MQTT 5. Both projects are available under the Apache open source license on GitHub.

Is Mosquitto the same as MQTT? ›

Eclipse Mosquitto is an open source (EPL/EDL licensed) message broker that implements the MQTT protocol versions 5.0, 3.1. 1 and 3.1. Mosquitto is lightweight and is suitable for use on all devices from low power single board computers to full servers.

What is the maximum bandwidth for MQTT? ›

Reference List
Maximum bandwidthUnlimited
Per device bandwidthUnlimited
MQTT Message
Message BytesDefault 1024KB, Max 256MB
40 more rows


1. Weintek Webinar 2018-09-19: MQTT to Cloud (Part 1)
2. Learn MQTT Protocol using Mosquitto & MQTT fx
3. Integrate Kafka and MQTT - How to connect MQTT and Kafka


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