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GNU LESSER GENERAL PUBLIC LICENSE
Version 2.1, February 1999
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That's all there is to it!

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:repository-owner: arduino-libraries
:repository-name: ArduinoMqttClient
= {repository-name} Library for Arduino =
image:https://github.com/{repository-owner}/{repository-name}/actions/workflows/check-arduino.yml/badge.svg["Check Arduino status", link="https://github.com/{repository-owner}/{repository-name}/actions/workflows/check-arduino.yml"]
image:https://github.com/{repository-owner}/{repository-name}/actions/workflows/compile-examples.yml/badge.svg["Compile Examples status", link="https://github.com/{repository-owner}/{repository-name}/actions/workflows/compile-examples.yml"]
image:https://github.com/{repository-owner}/{repository-name}/actions/workflows/spell-check.yml/badge.svg["Spell Check status", link="https://github.com/{repository-owner}/{repository-name}/actions/workflows/spell-check.yml"]
Allows you to send and receive MQTT messages using Arduino.

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/*
ArduinoMqttClient - WiFi Advanced Callback
This example connects to a MQTT broker and subscribes to a single topic,
it also publishes a message to another topic every 10 seconds.
When a message is received it prints the message to the Serial Monitor,
it uses the callback functionality of the library.
It also demonstrates how to set the will message, get/set QoS,
duplicate and retain values of messages.
The circuit:
- Arduino MKR 1000, MKR 1010 or Uno WiFi Rev2 board
This example code is in the public domain.
*/
#include <ArduinoMqttClient.h>
#if defined(ARDUINO_SAMD_MKRWIFI1010) || defined(ARDUINO_SAMD_NANO_33_IOT) || defined(ARDUINO_AVR_UNO_WIFI_REV2)
#include <WiFiNINA.h>
#elif defined(ARDUINO_SAMD_MKR1000)
#include <WiFi101.h>
#elif defined(ARDUINO_ARCH_ESP8266)
#include <ESP8266WiFi.h>
#elif defined(ARDUINO_PORTENTA_H7_M7) || defined(ARDUINO_NICLA_VISION) || defined(ARDUINO_ARCH_ESP32) || defined(ARDUINO_GIGA) || defined(ARDUINO_OPTA)
#include <WiFi.h>
#elif defined(ARDUINO_PORTENTA_C33)
#include <WiFiC3.h>
#elif defined(ARDUINO_UNOR4_WIFI)
#include <WiFiS3.h>
#endif
#include "arduino_secrets.h"
///////please enter your sensitive data in the Secret tab/arduino_secrets.h
char ssid[] = SECRET_SSID; // your network SSID (name)
char pass[] = SECRET_PASS; // your network password (use for WPA, or use as key for WEP)
// To connect with SSL/TLS:
// 1) Change WiFiClient to WiFiSSLClient.
// 2) Change port value from 1883 to 8883.
// 3) Change broker value to a server with a known SSL/TLS root certificate
// flashed in the WiFi module.
WiFiClient wifiClient;
MqttClient mqttClient(wifiClient);
const char broker[] = "test.mosquitto.org";
int port = 1883;
const char willTopic[] = "arduino/will";
const char inTopic[] = "arduino/in";
const char outTopic[] = "arduino/out";
const long interval = 10000;
unsigned long previousMillis = 0;
int count = 0;
void setup() {
//Initialize serial and wait for port to open:
Serial.begin(9600);
while (!Serial) {
; // wait for serial port to connect. Needed for native USB port only
}
// attempt to connect to WiFi network:
Serial.print("Attempting to connect to WPA SSID: ");
Serial.println(ssid);
while (WiFi.begin(ssid, pass) != WL_CONNECTED) {
// failed, retry
Serial.print(".");
delay(5000);
}
Serial.println("You're connected to the network");
Serial.println();
// You can provide a unique client ID, if not set the library uses Arduino-millis()
// Each client must have a unique client ID
// mqttClient.setId("clientId");
// You can provide a username and password for authentication
// mqttClient.setUsernamePassword("username", "password");
// By default the library connects with the "clean session" flag set,
// you can disable this behaviour by using
// mqttClient.setCleanSession(false);
// set a will message, used by the broker when the connection dies unexpectedly
// you must know the size of the message beforehand, and it must be set before connecting
String willPayload = "oh no!";
bool willRetain = true;
int willQos = 1;
mqttClient.beginWill(willTopic, willPayload.length(), willRetain, willQos);
mqttClient.print(willPayload);
mqttClient.endWill();
Serial.print("Attempting to connect to the MQTT broker: ");
Serial.println(broker);
if (!mqttClient.connect(broker, port)) {
Serial.print("MQTT connection failed! Error code = ");
Serial.println(mqttClient.connectError());
while (1);
}
Serial.println("You're connected to the MQTT broker!");
Serial.println();
// set the message receive callback
mqttClient.onMessage(onMqttMessage);
Serial.print("Subscribing to topic: ");
Serial.println(inTopic);
Serial.println();
// subscribe to a topic
// the second parameter sets the QoS of the subscription,
// the the library supports subscribing at QoS 0, 1, or 2
int subscribeQos = 1;
mqttClient.subscribe(inTopic, subscribeQos);
// topics can be unsubscribed using:
// mqttClient.unsubscribe(inTopic);
Serial.print("Waiting for messages on topic: ");
Serial.println(inTopic);
Serial.println();
}
void loop() {
// call poll() regularly to allow the library to receive MQTT messages and
// send MQTT keep alives which avoids being disconnected by the broker
mqttClient.poll();
// to avoid having delays in loop, we'll use the strategy from BlinkWithoutDelay
// see: File -> Examples -> 02.Digital -> BlinkWithoutDelay for more info
unsigned long currentMillis = millis();
if (currentMillis - previousMillis >= interval) {
// save the last time a message was sent
previousMillis = currentMillis;
String payload;
payload += "hello world!";
payload += " ";
payload += count;
Serial.print("Sending message to topic: ");
Serial.println(outTopic);
Serial.println(payload);
// send message, the Print interface can be used to set the message contents
// in this case we know the size ahead of time, so the message payload can be streamed
bool retained = false;
int qos = 1;
bool dup = false;
mqttClient.beginMessage(outTopic, payload.length(), retained, qos, dup);
mqttClient.print(payload);
mqttClient.endMessage();
Serial.println();
count++;
}
}
void onMqttMessage(int messageSize) {
// we received a message, print out the topic and contents
Serial.print("Received a message with topic '");
Serial.print(mqttClient.messageTopic());
Serial.print("', duplicate = ");
Serial.print(mqttClient.messageDup() ? "true" : "false");
Serial.print(", QoS = ");
Serial.print(mqttClient.messageQoS());
Serial.print(", retained = ");
Serial.print(mqttClient.messageRetain() ? "true" : "false");
Serial.print("', length ");
Serial.print(messageSize);
Serial.println(" bytes:");
// use the Stream interface to print the contents
while (mqttClient.available()) {
Serial.print((char)mqttClient.read());
}
Serial.println();
Serial.println();
}

2
ArduinoMqttClient/examples/WiFiAdvancedCallback/arduino_secrets.h Normal file
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#define SECRET_SSID ""
#define SECRET_PASS ""

150
ArduinoMqttClient/examples/WiFiEcho/WiFiEcho.ino Normal file
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/*
ArduinoMqttClient - WiFi Echo
This example connects to a MQTT broker and subscribes to a single topic,
it also publishes a message to the same topic once a second.
When a message is received it prints the message to the Serial Monitor.
The circuit:
- Arduino MKR 1000, MKR 1010 or Uno WiFi Rev2 board
This example code is in the public domain.
*/
#include <ArduinoMqttClient.h>
#if defined(ARDUINO_SAMD_MKRWIFI1010) || defined(ARDUINO_SAMD_NANO_33_IOT) || defined(ARDUINO_AVR_UNO_WIFI_REV2)
#include <WiFiNINA.h>
#elif defined(ARDUINO_SAMD_MKR1000)
#include <WiFi101.h>
#elif defined(ARDUINO_ARCH_ESP8266)
#include <ESP8266WiFi.h>
#elif defined(ARDUINO_PORTENTA_H7_M7) || defined(ARDUINO_NICLA_VISION) || defined(ARDUINO_ARCH_ESP32) || defined(ARDUINO_GIGA) || defined(ARDUINO_OPTA)
#include <WiFi.h>
#elif defined(ARDUINO_PORTENTA_C33)
#include <WiFiC3.h>
#elif defined(ARDUINO_UNOR4_WIFI)
#include <WiFiS3.h>
#endif
#include "arduino_secrets.h"
///////please enter your sensitive data in the Secret tab/arduino_secrets.h
char ssid[] = SECRET_SSID; // your network SSID (name)
char pass[] = SECRET_PASS; // your network password (use for WPA, or use as key for WEP)
// To connect with SSL/TLS:
// 1) Change WiFiClient to WiFiSSLClient.
// 2) Change port value from 1883 to 8883.
// 3) Change broker value to a server with a known SSL/TLS root certificate
// flashed in the WiFi module.
WiFiClient wifiClient;
MqttClient mqttClient(wifiClient);
const char broker[] = "test.mosquitto.org";
int port = 1883;
const char topic[] = "arduino/echo";
const long interval = 1000;
unsigned long previousMillis = 0;
int count = 0;
void setup() {
//Initialize serial and wait for port to open:
Serial.begin(9600);
while (!Serial) {
; // wait for serial port to connect. Needed for native USB port only
}
// attempt to connect to WiFi network:
Serial.print("Attempting to connect to WPA SSID: ");
Serial.println(ssid);
while (WiFi.begin(ssid, pass) != WL_CONNECTED) {
// failed, retry
Serial.print(".");
delay(5000);
}
Serial.println("You're connected to the network");
Serial.println();
// You can provide a unique client ID, if not set the library uses Arduino-millis()
// Each client must have a unique client ID
// mqttClient.setId("clientId");
// You can provide a username and password for authentication
// mqttClient.setUsernamePassword("username", "password");
Serial.print("Attempting to connect to the MQTT broker: ");
Serial.println(broker);
if (!mqttClient.connect(broker, port)) {
Serial.print("MQTT connection failed! Error code = ");
Serial.println(mqttClient.connectError());
while (1);
}
Serial.println("You're connected to the MQTT broker!");
Serial.println();
Serial.print("Subscribing to topic: ");
Serial.println(topic);
Serial.println();
// subscribe to a topic
mqttClient.subscribe(topic);
// topics can be unsubscribed using:
// mqttClient.unsubscribe(topic);
Serial.print("Waiting for messages on topic: ");
Serial.println(topic);
Serial.println();
}
void loop() {
// check for incoming messages
int messageSize = mqttClient.parseMessage();
if (messageSize) {
// we received a message, print out the topic and contents
Serial.print("Received a message with topic '");
Serial.print(mqttClient.messageTopic());
Serial.print("', length ");
Serial.print(messageSize);
Serial.println(" bytes:");
// use the Stream interface to print the contents
while (mqttClient.available()) {
Serial.print((char)mqttClient.read());
}
Serial.println();
Serial.println();
}
// to avoid having delays in loop, we'll use the strategy from BlinkWithoutDelay
// see: File -> Examples -> 02.Digital -> BlinkWithoutDelay for more info
unsigned long currentMillis = millis();
if (currentMillis - previousMillis >= interval) {
// save the last time a message was sent
previousMillis = currentMillis;
Serial.print("Sending message to topic: ");
Serial.println(topic);
Serial.print("echo ");
Serial.println(count);
// send message, the Print interface can be used to set the message contents
mqttClient.beginMessage(topic);
mqttClient.print("echo ");
mqttClient.print(count);
mqttClient.endMessage();
Serial.println();
count++;
}
}

2
ArduinoMqttClient/examples/WiFiEcho/arduino_secrets.h Normal file
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#define SECRET_SSID ""
#define SECRET_PASS ""

155
ArduinoMqttClient/examples/WiFiEchoCallback/WiFiEchoCallback.ino Normal file
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/*
ArduinoMqttClient - WiFi Echo
This example connects to a MQTT broker and subscribes to a single topic,
it also publishes a message to the same topic once a second.
When a message is received it prints the message to the Serial Monitor,
it uses the callback functionality of the library.
The circuit:
- Arduino MKR 1000, MKR 1010 or Uno WiFi Rev2 board
This example code is in the public domain.
*/
#include <ArduinoMqttClient.h>
#if defined(ARDUINO_SAMD_MKRWIFI1010) || defined(ARDUINO_SAMD_NANO_33_IOT) || defined(ARDUINO_AVR_UNO_WIFI_REV2)
#include <WiFiNINA.h>
#elif defined(ARDUINO_SAMD_MKR1000)
#include <WiFi101.h>
#elif defined(ARDUINO_ARCH_ESP8266)
#include <ESP8266WiFi.h>
#elif defined(ARDUINO_PORTENTA_H7_M7) || defined(ARDUINO_NICLA_VISION) || defined(ARDUINO_ARCH_ESP32) || defined(ARDUINO_GIGA) || defined(ARDUINO_OPTA)
#include <WiFi.h>
#elif defined(ARDUINO_PORTENTA_C33)
#include <WiFiC3.h>
#elif defined(ARDUINO_UNOR4_WIFI)
#include <WiFiS3.h>
#endif
#include "arduino_secrets.h"
///////please enter your sensitive data in the Secret tab/arduino_secrets.h
char ssid[] = SECRET_SSID; // your network SSID (name)
char pass[] = SECRET_PASS; // your network password (use for WPA, or use as key for WEP)
// To connect with SSL/TLS:
// 1) Change WiFiClient to WiFiSSLClient.
// 2) Change port value from 1883 to 8883.
// 3) Change broker value to a server with a known SSL/TLS root certificate
// flashed in the WiFi module.
WiFiClient wifiClient;
MqttClient mqttClient(wifiClient);
const char broker[] = "test.mosquitto.org";
int port = 1883;
const char topic[] = "arduino/echo";
const long interval = 1000;
unsigned long previousMillis = 0;
int count = 0;
void setup() {
//Initialize serial and wait for port to open:
Serial.begin(9600);
while (!Serial) {
; // wait for serial port to connect. Needed for native USB port only
}
// attempt to connect to WiFi network:
Serial.print("Attempting to connect to WPA SSID: ");
Serial.println(ssid);
while (WiFi.begin(ssid, pass) != WL_CONNECTED) {
// failed, retry
Serial.print(".");
delay(5000);
}
Serial.println("You're connected to the network");
Serial.println();
// You can provide a unique client ID, if not set the library uses Arduino-millis()
// Each client must have a unique client ID
// mqttClient.setId("clientId");
// You can provide a username and password for authentication
// mqttClient.setUsernamePassword("username", "password");
Serial.print("Attempting to connect to the MQTT broker: ");
Serial.println(broker);
if (!mqttClient.connect(broker, port)) {
Serial.print("MQTT connection failed! Error code = ");
Serial.println(mqttClient.connectError());
while (1);
}
Serial.println("You're connected to the MQTT broker!");
Serial.println();
// set the message receive callback
mqttClient.onMessage(onMqttMessage);
Serial.print("Subscribing to topic: ");
Serial.println(topic);
Serial.println();
// subscribe to a topic
mqttClient.subscribe(topic);
// topics can be unsubscribed using:
// mqttClient.unsubscribe(topic);
Serial.print("Waiting for messages on topic: ");
Serial.println(topic);
Serial.println();
}
void loop() {
// call poll() regularly to allow the library to receive MQTT messages and
// send MQTT keep alives which avoids being disconnected by the broker
mqttClient.poll();
// to avoid having delays in loop, we'll use the strategy from BlinkWithoutDelay
// see: File -> Examples -> 02.Digital -> BlinkWithoutDelay for more info
unsigned long currentMillis = millis();
if (currentMillis - previousMillis >= interval) {
// save the last time a message was sent
previousMillis = currentMillis;
Serial.print("Sending message to topic: ");
Serial.println(topic);
Serial.print("echo ");
Serial.println(count);
// send message, the Print interface can be used to set the message contents
mqttClient.beginMessage(topic);
mqttClient.print("echo ");
mqttClient.print(count);
mqttClient.endMessage();
Serial.println();
count++;
}
}
void onMqttMessage(int messageSize) {
// we received a message, print out the topic and contents
Serial.print("Received a message with topic '");
Serial.print(mqttClient.messageTopic());
Serial.print("', length ");
Serial.print(messageSize);
Serial.println(" bytes:");
// use the Stream interface to print the contents
while (mqttClient.available()) {
Serial.print((char)mqttClient.read());
}
Serial.println();
Serial.println();
}

2
ArduinoMqttClient/examples/WiFiEchoCallback/arduino_secrets.h Normal file
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#define SECRET_SSID ""
#define SECRET_PASS ""

118
ArduinoMqttClient/examples/WiFiSimpleReceive/WiFiSimpleReceive.ino Normal file
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/*
ArduinoMqttClient - WiFi Simple Receive
This example connects to a MQTT broker and subscribes to a single topic.
When a message is received it prints the message to the Serial Monitor.
The circuit:
- Arduino MKR 1000, MKR 1010 or Uno WiFi Rev2 board
This example code is in the public domain.
*/
#include <ArduinoMqttClient.h>
#if defined(ARDUINO_SAMD_MKRWIFI1010) || defined(ARDUINO_SAMD_NANO_33_IOT) || defined(ARDUINO_AVR_UNO_WIFI_REV2)
#include <WiFiNINA.h>
#elif defined(ARDUINO_SAMD_MKR1000)
#include <WiFi101.h>
#elif defined(ARDUINO_ARCH_ESP8266)
#include <ESP8266WiFi.h>
#elif defined(ARDUINO_PORTENTA_H7_M7) || defined(ARDUINO_NICLA_VISION) || defined(ARDUINO_ARCH_ESP32) || defined(ARDUINO_GIGA) || defined(ARDUINO_OPTA)
#include <WiFi.h>
#elif defined(ARDUINO_PORTENTA_C33)
#include <WiFiC3.h>
#elif defined(ARDUINO_UNOR4_WIFI)
#include <WiFiS3.h>
#endif
#include "arduino_secrets.h"
///////please enter your sensitive data in the Secret tab/arduino_secrets.h
char ssid[] = SECRET_SSID; // your network SSID (name)
char pass[] = SECRET_PASS; // your network password (use for WPA, or use as key for WEP)
// To connect with SSL/TLS:
// 1) Change WiFiClient to WiFiSSLClient.
// 2) Change port value from 1883 to 8883.
// 3) Change broker value to a server with a known SSL/TLS root certificate
// flashed in the WiFi module.
WiFiClient wifiClient;
MqttClient mqttClient(wifiClient);
const char broker[] = "test.mosquitto.org";
int port = 1883;
const char topic[] = "arduino/simple";
void setup() {
//Initialize serial and wait for port to open:
Serial.begin(9600);
while (!Serial) {
; // wait for serial port to connect. Needed for native USB port only
}
// attempt to connect to WiFi network:
Serial.print("Attempting to connect to WPA SSID: ");
Serial.println(ssid);
while (WiFi.begin(ssid, pass) != WL_CONNECTED) {
// failed, retry
Serial.print(".");
delay(5000);
}
Serial.println("You're connected to the network");
Serial.println();
// You can provide a unique client ID, if not set the library uses Arduino-millis()
// Each client must have a unique client ID
// mqttClient.setId("clientId");
// You can provide a username and password for authentication
// mqttClient.setUsernamePassword("username", "password");
Serial.print("Attempting to connect to the MQTT broker: ");
Serial.println(broker);
if (!mqttClient.connect(broker, port)) {
Serial.print("MQTT connection failed! Error code = ");
Serial.println(mqttClient.connectError());
while (1);
}
Serial.println("You're connected to the MQTT broker!");
Serial.println();
Serial.print("Subscribing to topic: ");
Serial.println(topic);
Serial.println();
// subscribe to a topic
mqttClient.subscribe(topic);
// topics can be unsubscribed using:
// mqttClient.unsubscribe(topic);
Serial.print("Waiting for messages on topic: ");
Serial.println(topic);
Serial.println();
}
void loop() {
int messageSize = mqttClient.parseMessage();
if (messageSize) {
// we received a message, print out the topic and contents
Serial.print("Received a message with topic '");
Serial.print(mqttClient.messageTopic());
Serial.print("', length ");
Serial.print(messageSize);
Serial.println(" bytes:");
// use the Stream interface to print the contents
while (mqttClient.available()) {
Serial.print((char)mqttClient.read());
}
Serial.println();
Serial.println();
}
}

2
ArduinoMqttClient/examples/WiFiSimpleReceive/arduino_secrets.h Normal file
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#define SECRET_SSID ""
#define SECRET_PASS ""

125
ArduinoMqttClient/examples/WiFiSimpleReceiveCallback/WiFiSimpleReceiveCallback.ino Normal file
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/*
ArduinoMqttClient - WiFi Simple Receive Callback
This example connects to a MQTT broker and subscribes to a single topic.
When a message is received it prints the message to the Serial Monitor,
it uses the callback functionality of the library.
The circuit:
- Arduino MKR 1000, MKR 1010 or Uno WiFi Rev2 board
This example code is in the public domain.
*/
#include <ArduinoMqttClient.h>
#if defined(ARDUINO_SAMD_MKRWIFI1010) || defined(ARDUINO_SAMD_NANO_33_IOT) || defined(ARDUINO_AVR_UNO_WIFI_REV2)
#include <WiFiNINA.h>
#elif defined(ARDUINO_SAMD_MKR1000)
#include <WiFi101.h>
#elif defined(ARDUINO_ARCH_ESP8266)
#include <ESP8266WiFi.h>
#elif defined(ARDUINO_PORTENTA_H7_M7) || defined(ARDUINO_NICLA_VISION) || defined(ARDUINO_ARCH_ESP32) || defined(ARDUINO_GIGA) || defined(ARDUINO_OPTA)
#include <WiFi.h>
#elif defined(ARDUINO_PORTENTA_C33)
#include <WiFiC3.h>
#elif defined(ARDUINO_UNOR4_WIFI)
#include <WiFiS3.h>
#endif
#include "arduino_secrets.h"
///////please enter your sensitive data in the Secret tab/arduino_secrets.h
char ssid[] = SECRET_SSID; // your network SSID (name)
char pass[] = SECRET_PASS; // your network password (use for WPA, or use as key for WEP)
// To connect with SSL/TLS:
// 1) Change WiFiClient to WiFiSSLClient.
// 2) Change port value from 1883 to 8883.
// 3) Change broker value to a server with a known SSL/TLS root certificate
// flashed in the WiFi module.
WiFiClient wifiClient;
MqttClient mqttClient(wifiClient);
const char broker[] = "test.mosquitto.org";
int port = 1883;
const char topic[] = "arduino/simple";
void setup() {
//Initialize serial and wait for port to open:
Serial.begin(9600);
while (!Serial) {
; // wait for serial port to connect. Needed for native USB port only
}
// attempt to connect to WiFi network:
Serial.print("Attempting to connect to WPA SSID: ");
Serial.println(ssid);
while (WiFi.begin(ssid, pass) != WL_CONNECTED) {
// failed, retry
Serial.print(".");
delay(5000);
}
Serial.println("You're connected to the network");
Serial.println();
// You can provide a unique client ID, if not set the library uses Arduino-millis()
// Each client must have a unique client ID
// mqttClient.setId("clientId");
// You can provide a username and password for authentication
// mqttClient.setUsernamePassword("username", "password");
Serial.print("Attempting to connect to the MQTT broker: ");
Serial.println(broker);
if (!mqttClient.connect(broker, port)) {
Serial.print("MQTT connection failed! Error code = ");
Serial.println(mqttClient.connectError());
while (1);
}
Serial.println("You're connected to the MQTT broker!");
Serial.println();
// set the message receive callback
mqttClient.onMessage(onMqttMessage);
Serial.print("Subscribing to topic: ");
Serial.println(topic);
Serial.println();
// subscribe to a topic
mqttClient.subscribe(topic);
// topics can be unsubscribed using:
// mqttClient.unsubscribe(topic);
Serial.print("Waiting for messages on topic: ");
Serial.println(topic);
Serial.println();
}
void loop() {
// call poll() regularly to allow the library to receive MQTT messages and
// send MQTT keep alives which avoids being disconnected by the broker
mqttClient.poll();
}
void onMqttMessage(int messageSize) {
// we received a message, print out the topic and contents
Serial.println("Received a message with topic '");
Serial.print(mqttClient.messageTopic());
Serial.print("', length ");
Serial.print(messageSize);
Serial.println(" bytes:");
// use the Stream interface to print the contents
while (mqttClient.available()) {
Serial.print((char)mqttClient.read());
}
Serial.println();
Serial.println();
}

2
ArduinoMqttClient/examples/WiFiSimpleReceiveCallback/arduino_secrets.h Normal file
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#define SECRET_SSID ""
#define SECRET_PASS ""

119
ArduinoMqttClient/examples/WiFiSimpleSender/WiFiSimpleSender.ino Normal file
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/*
ArduinoMqttClient - WiFi Simple Sender
This example connects to a MQTT broker and publishes a message to
a topic once a second.
The circuit:
- Arduino MKR 1000, MKR 1010 or Uno WiFi Rev2 board
This example code is in the public domain.
*/
#include <ArduinoMqttClient.h>
#if defined(ARDUINO_SAMD_MKRWIFI1010) || defined(ARDUINO_SAMD_NANO_33_IOT) || defined(ARDUINO_AVR_UNO_WIFI_REV2)
#include <WiFiNINA.h>
#elif defined(ARDUINO_SAMD_MKR1000)
#include <WiFi101.h>
#elif defined(ARDUINO_ARCH_ESP8266)
#include <ESP8266WiFi.h>
#elif defined(ARDUINO_PORTENTA_H7_M7) || defined(ARDUINO_NICLA_VISION) || defined(ARDUINO_ARCH_ESP32) || defined(ARDUINO_GIGA) || defined(ARDUINO_OPTA)
#include <WiFi.h>
#elif defined(ARDUINO_PORTENTA_C33)
#include <WiFiC3.h>
#elif defined(ARDUINO_UNOR4_WIFI)
#include <WiFiS3.h>
#endif
#include "arduino_secrets.h"
///////please enter your sensitive data in the Secret tab/arduino_secrets.h
char ssid[] = SECRET_SSID; // your network SSID (name)
char pass[] = SECRET_PASS; // your network password (use for WPA, or use as key for WEP)
// To connect with SSL/TLS:
// 1) Change WiFiClient to WiFiSSLClient.
// 2) Change port value from 1883 to 8883.
// 3) Change broker value to a server with a known SSL/TLS root certificate
// flashed in the WiFi module.
WiFiClient wifiClient;
MqttClient mqttClient(wifiClient);
const char broker[] = "test.mosquitto.org";
int port = 1883;
const char topic[] = "arduino/simple";
const long interval = 1000;
unsigned long previousMillis = 0;
int count = 0;
void setup() {
//Initialize serial and wait for port to open:
Serial.begin(9600);
while (!Serial) {
; // wait for serial port to connect. Needed for native USB port only
}
// attempt to connect to WiFi network:
Serial.print("Attempting to connect to WPA SSID: ");
Serial.println(ssid);
while (WiFi.begin(ssid, pass) != WL_CONNECTED) {
// failed, retry
Serial.print(".");
delay(5000);
}
Serial.println("You're connected to the network");
Serial.println();
// You can provide a unique client ID, if not set the library uses Arduino-millis()
// Each client must have a unique client ID
// mqttClient.setId("clientId");
// You can provide a username and password for authentication
// mqttClient.setUsernamePassword("username", "password");
Serial.print("Attempting to connect to the MQTT broker: ");
Serial.println(broker);
if (!mqttClient.connect(broker, port)) {
Serial.print("MQTT connection failed! Error code = ");
Serial.println(mqttClient.connectError());
while (1);
}
Serial.println("You're connected to the MQTT broker!");
Serial.println();
}
void loop() {
// call poll() regularly to allow the library to send MQTT keep alives which
// avoids being disconnected by the broker
mqttClient.poll();
// to avoid having delays in loop, we'll use the strategy from BlinkWithoutDelay
// see: File -> Examples -> 02.Digital -> BlinkWithoutDelay for more info
unsigned long currentMillis = millis();
if (currentMillis - previousMillis >= interval) {
// save the last time a message was sent
previousMillis = currentMillis;
Serial.print("Sending message to topic: ");
Serial.println(topic);
Serial.print("hello ");
Serial.println(count);
// send message, the Print interface can be used to set the message contents
mqttClient.beginMessage(topic);
mqttClient.print("hello ");
mqttClient.print(count);
mqttClient.endMessage();
Serial.println();
count++;
}
}

2
ArduinoMqttClient/examples/WiFiSimpleSender/arduino_secrets.h Normal file
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#define SECRET_SSID ""
#define SECRET_PASS ""

52
ArduinoMqttClient/keywords.txt Normal file
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############################################
# Syntax Coloring Map For ArduinoMqttClient
############################################
# Class
############################################
ArduinoMqttClient KEYWORD1
MqttClient KEYWORD1
############################################
# Methods and Functions
############################################
onMessage KEYWORD2
parseMessage KEYWORD2
messageTopic KEYWORD2
messageDup KEYWORD2
messageQoS KEYWORD2
messageRetain KEYWORD2
beginMessage KEYWORD2
endMessage KEYWORD2
beginWill KEYWORD2
endWill KEYWORD2
subscribe KEYWORD2
unsubscribe KEYWORD2
poll KEYWORD2
connect KEYWORD2
write KEYWORD2
available KEYWORD2
read KEYWORD2
peek KEYWORD2
flush KEYWORD2
stop KEYWORD2
connected KEYWORD2
setId KEYWORD2
setUsernamePassword KEYWORD2
setCleanSession KEYWORD2
setKeepAliveInterval KEYWORD2
setConnectionTimeout KEYWORD2
connectError KEYWORD2
subscribeQoS KEYWORD2
############################################
# Constants
############################################

10
ArduinoMqttClient/library.properties Normal file
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name=ArduinoMqttClient
version=0.1.8
author=Arduino
maintainer=Arduino <info@arduino.cc>
sentence=[BETA] Allows you to send and receive MQTT messages using Arduino.
paragraph=
category=Communication
url=https://github.com/arduino-libraries/ArduinoMqttClient
architectures=*
includes=ArduinoMqttClient.h

25
ArduinoMqttClient/src/ArduinoMqttClient.h Normal file
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/*
This file is part of the ArduinoMqttClient library.
Copyright (c) 2019 Arduino SA. All rights reserved.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef _ARDUINO_MQTT_CLIENT_H_
#define _ARDUINO_MQTT_CLIENT_H_
#include "MqttClient.h"
#endif

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/*
This file is part of the ArduinoMqttClient library.
Copyright (c) 2019 Arduino SA. All rights reserved.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef _MQTT_CLIENT_H_
#define _MQTT_CLIENT_H_
#include <Arduino.h>
#include <Client.h>
#define MQTT_CONNECTION_REFUSED -2
#define MQTT_CONNECTION_TIMEOUT -1
#define MQTT_SUCCESS 0
#define MQTT_UNACCEPTABLE_PROTOCOL_VERSION 1
#define MQTT_IDENTIFIER_REJECTED 2
#define MQTT_SERVER_UNAVAILABLE 3
#define MQTT_BAD_USER_NAME_OR_PASSWORD 4
#define MQTT_NOT_AUTHORIZED 5
// Make this definition in your application code to use std::functions for onMessage callbacks instead of C-pointers:
// #define MQTT_CLIENT_STD_FUNCTION_CALLBACK
#ifdef MQTT_CLIENT_STD_FUNCTION_CALLBACK
#include <functional>
#endif
class MqttClient : public Client {
public:
MqttClient(Client* client);
MqttClient(Client& client);
virtual ~MqttClient();
#ifdef MQTT_CLIENT_STD_FUNCTION_CALLBACK
typedef std::function<void(MqttClient *client, int messageSize)> MessageCallback;
void onMessage(MessageCallback callback);
#else
inline void setClient(Client& client) { _client = &client; }
void onMessage(void(*)(int));
#endif
int parseMessage();
String messageTopic() const;
int messageDup() const;
int messageQoS() const;
int messageRetain() const;
int beginMessage(const char* topic, unsigned long size, bool retain = false, uint8_t qos = 0, bool dup = false);
int beginMessage(const String& topic, unsigned long size, bool retain = false, uint8_t qos = 0, bool dup = false);
int beginMessage(const char* topic, bool retain = false, uint8_t qos = 0, bool dup = false);
int beginMessage(const String& topic, bool retain = false, uint8_t qos = 0, bool dup = false);
int endMessage();
int beginWill(const char* topic, unsigned short size, bool retain, uint8_t qos);
int beginWill(const String& topic, unsigned short size, bool retain, uint8_t qos);
int beginWill(const char* topic, bool retain, uint8_t qos);
int beginWill(const String& topic, bool retain, uint8_t qos);
int endWill();
int subscribe(const char* topic, uint8_t qos = 0);
int subscribe(const String& topic, uint8_t qos = 0);
int unsubscribe(const char* topic);
int unsubscribe(const String& topic);
void poll();
// from Client
virtual int connect(IPAddress ip, uint16_t port = 1883);
virtual int connect(const char *host, uint16_t port = 1883);
#ifdef ESP8266
virtual int connect(const IPAddress& ip, uint16_t port) { return 0; }; /* ESP8266 core defines this pure virtual in Client.h */
#endif
virtual size_t write(uint8_t);
virtual size_t write(const uint8_t *buf, size_t size);
virtual int available();
virtual int read();
virtual int read(uint8_t *buf, size_t size);
virtual int peek();
virtual void flush();
virtual void stop();
virtual uint8_t connected();
virtual operator bool();
void setId(const char* id);
void setId(const String& id);
void setUsernamePassword(const char* username, const char* password);
void setUsernamePassword(const String& username, const String& password);
void setCleanSession(bool cleanSession);
void setKeepAliveInterval(unsigned long interval);
void setConnectionTimeout(unsigned long timeout);
void setTxPayloadSize(unsigned short size);
int connectError() const;
int subscribeQoS() const;
#ifdef ESP8266
virtual bool flush(unsigned int /*maxWaitMs*/) { flush(); return true; } /* ESP8266 core defines this pure virtual in Client.h */
virtual bool stop(unsigned int /*maxWaitMs*/) { stop(); return true; } /* ESP8266 core defines this pure virtual in Client.h */
#endif
private:
int connect(IPAddress ip, const char* host, uint16_t port);
int publishHeader(size_t length);
void puback(uint16_t id);
void pubrec(uint16_t id);
void pubrel(uint16_t id);
void pubcomp(uint16_t id);
void ping();
void disconnect();
int beginPacket(uint8_t type, uint8_t flags, size_t length, uint8_t* buffer);
int writeString(const char* s, uint16_t length);
int write8(uint8_t val);
int write16(uint16_t val);
int writeData(const void* data, size_t length);
int endPacket();
void ackRxMessage();
uint8_t clientConnected();
int clientAvailable();
int clientRead();
int clientTimedRead();
int clientPeek();
size_t clientWrite(const uint8_t *buf, size_t size);
private:
Client* _client;
#ifdef MQTT_CLIENT_STD_FUNCTION_CALLBACK
MessageCallback _onMessage;
#else
void (*_onMessage)(int);
#endif
String _id;
String _username;
String _password;
bool _cleanSession;
unsigned long _keepAliveInterval;
unsigned long _connectionTimeout;
unsigned short _tx_payload_buffer_size;
int _connectError;
bool _connected;
int _subscribeQos;
int _rxState;
uint8_t _rxType;
uint8_t _rxFlags;
size_t _rxLength;
uint32_t _rxLengthMultiplier;
int _returnCode;
String _rxMessageTopic;
size_t _rxMessageTopicLength;
bool _rxMessageDup;
uint8_t _rxMessageQoS;
bool _rxMessageRetain;
uint16_t _rxPacketId;
uint8_t _rxMessageBuffer[3];
size_t _rxMessageIndex;
unsigned long _lastRx;
String _txMessageTopic;
bool _txMessageRetain;
uint8_t _txMessageQoS;
bool _txMessageDup;
uint16_t _txPacketId;
uint8_t* _txBuffer;
size_t _txBufferIndex;
bool _txStreamPayload;
uint8_t* _txPayloadBuffer;
size_t _txPayloadBufferIndex;
unsigned long _lastPingTx;
uint8_t* _willBuffer;
uint16_t _willBufferIndex;
size_t _willMessageIndex;
uint8_t _willFlags;
};
#endif