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