COPIED

1   #include <ArduinoMqttClient.h>

2   #include <WiFiNINA.h>

3   #include "arduino_secrets.h"

4   

5   ///////please enter your sensitive data in the Secret tab/arduino_secrets.h

6   char ssid[] = SECRET_SSID;        // your network SSID (name)

7   char pass[] = SECRET_PASS;    // your network password (use for WPA, or use as key for WEP)

8   

9   WiFiClient wifiClient;

10  MqttClient mqttClient(wifiClient);

11  

12  const char broker[] = "test.mosquitto.org";

13  int        port     = 1883;

14  const char topic[]  = "real_unique_topic";

15  const char topic2[]  = "real_unique_topic_2";

16  const char topic3[]  = "real_unique_topic_3";

17  

18  //set interval for sending messages (milliseconds)

19  const long interval = 8000;

20  unsigned long previousMillis = 0;

21  

22  int count = 0;

23  

24  void setup() {

25    //Initialize serial and wait for port to open:

26    Serial.begin(9600);

27    while (!Serial) {

28      ; // wait for serial port to connect. Needed for native USB port only

29    }

30  

31    // attempt to connect to Wifi network:

32    Serial.print("Attempting to connect to WPA SSID: ");

33    Serial.println(ssid);

34    while (WiFi.begin(ssid, pass) != WL_CONNECTED) {

35      // failed, retry

36      Serial.print(".");

37      delay(5000);

38    }

39  

40    Serial.println("You're connected to the network");

41    Serial.println();

42  

43    Serial.print("Attempting to connect to the MQTT broker: ");

44    Serial.println(broker);

45  

46    if (!mqttClient.connect(broker, port)) {

47      Serial.print("MQTT connection failed! Error code = ");

48      Serial.println(mqttClient.connectError());

49  

50      while (1);

51    }

52  

53    Serial.println("You're connected to the MQTT broker!");

54    Serial.println();

55  }

56  

57  void loop() {

58    // call poll() regularly to allow the library to send MQTT keep alive which

59    // avoids being disconnected by the broker

60    mqttClient.poll();

61  

62    unsigned long currentMillis = millis();

63  

64    if (currentMillis - previousMillis >= interval) {

65      // save the last time a message was sent

66      previousMillis = currentMillis;

67  

68      //record random value from A0, A1 and A2

69      int Rvalue = analogRead(A0);

70      int Rvalue2 = analogRead(A1);

71      int Rvalue3 = analogRead(A2);

72  

73      Serial.print("Sending message to topic: ");

74      Serial.println(topic);

75      Serial.println(Rvalue);

76  

77      Serial.print("Sending message to topic: ");

78      Serial.println(topic2);

79      Serial.println(Rvalue2);

80  

81      Serial.print("Sending message to topic: ");

82      Serial.println(topic2);

83      Serial.println(Rvalue3);

84  

85      // send message, the Print interface can be used to set the message contents

86      mqttClient.beginMessage(topic);

87      mqttClient.print(Rvalue);

88      mqttClient.endMessage();

89  

90      mqttClient.beginMessage(topic2);

91      mqttClient.print(Rvalue2);

92      mqttClient.endMessage();

93  

94      mqttClient.beginMessage(topic3);

95      mqttClient.print(Rvalue3);

96      mqttClient.endMessage();

97  

98      Serial.println();

99    }

100 }