I have an Arduino Uno, Ethernet shield, temperature sensor and a DS1307 RTC connected to an MQTT broker using the ArduinoMqttClient library. It connects fine when I have the IDE open, if I close the IDE, it seems to work for a minute and stop.
The only way to get it connected again is to open the IDE and I can see in the serial output that it connects and I see the temperature in the broker. Does anyone have any ideas whats going on?
This is my first project and I am learning how it all works together. see my ugly code below that I pieced together from the posts on here. thanks!
#include <SPI.h>
#include <Ethernet.h>
#include <ArduinoMqttClient.h>
#include <RTClib.h>
#include <OneWire.h>
#include <DallasTemperature.h>
// Enter a MAC address and IP address for your controller below.
// The IP address will be dependent on your local network:
byte mac[] = {0x00, 0x02, 0x0A, 0x0F, 0x06, 0x0E};
IPAddress ip(192, 168, 1, 2);
IPAddress gateway(192, 168, 1, 1);
IPAddress subnet(255, 255, 255, 240);
// Setup the broker
IPAddress broker(192,168,1,3);
int port = 1883;
const char topic[] = "temperature";
// Create an ethernet client
EthernetClient ethClient;
MqttClient mqttClient(ethClient);
// Declare RTC Object
RTC_DS1307 rtc;
// Data wire from temp sensor is on port 2
#define ONE_WIRE_BUS 2
#define TEMPERATURE_PRECISION 9
// setup the instance
OneWire oneWire(ONE_WIRE_BUS);
// Pass our oneWire reference to Dallas Temperature.
DallasTemperature sensors(&oneWire);
// setup the variables
int count = 0; // just a counter for the mqtt broker connections
int inPin = 7; // Pushbutton on pin 7
int pushButtonValue = 0; // variable to store the read value
float previousTemperatureF = 0; // keep track of the last temperature
unsigned long previousUnixTime = 0; // last time update
long interval = 300; // Interval to wait to do sumpin, 300s = 5min
// Used for mapping the days of the week
char daysOfTheWeek[7][12] = {
"Sunday",
"Monday",
"Tuesday",
"Wednesday",
"Thursday",
"Friday",
"Saturday"
};
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
}
// sets the digital pin 7 as input for the button
pinMode(inPin, INPUT);
if (!rtc.begin()) {
Serial.println("Couldn't find RTC");
Serial.flush();
abort();
}
if (!rtc.isrunning()) {
Serial.println("RTC is NOT running!");
// following line sets the RTC to the date & time this sketch was compiled
rtc.adjust(DateTime(__DATE__, __TIME__));
}
// Start the ethernet connection
Ethernet.begin(mac, ip, gateway, subnet);
//print out the IP address
Serial.print("IP = ");
Serial.println(Ethernet.localIP());
// Connect to the broker
mqttClient.setId("arduino");
mqttClient.setUsernamePassword("username", "password");
Serial.print("Attempting to connect to the MQTT broker at address "); Serial.print(broker);
Serial.print(" on port "); Serial.println(port);
while (!mqttClient.connect(broker, port)) {
Serial.print("Connection Attempt: ");
Serial.println(count);
Serial.print("MQTT connection failed! Error code = ");
Serial.println(mqttClient.connectError());
count++;
delay(1000);
}
Serial.println("You're connected to the MQTT broker!");
Serial.println();
// Start up the sensor library to read the temperature
sensors.begin();
}
void printTime(DateTime time) {
Serial.print("Current Time: ");
Serial.print(time.year(), DEC);
Serial.print('/');
Serial.print(time.month(), DEC);
Serial.print('/');
Serial.print(time.day(), DEC);
Serial.print(" (");
Serial.print(daysOfTheWeek[time.dayOfTheWeek()]);
Serial.print(") ");
Serial.print(time.hour(), DEC);
Serial.print(':');
Serial.print(time.minute(), DEC);
Serial.print(':');
Serial.println(time.second(), DEC);
}
void loop() {
// read the input pin
pushButtonValue = digitalRead(inPin);
// call poll() regularly to allow the library to send MQTT keep alive which
// avoids being disconnected by the broker
mqttClient.poll();
sensors.requestTemperatures(); // Send the command to get temperatures
float currentTemperatureF = sensors.getTempFByIndex(0); // get the temp in F, we only have one temp module so its 0
// Whats the time!
DateTime now = rtc.now(); // current time
//DateTime future; // time to add too
unsigned long currentUnixTime = now.unixtime();
// check every 5 minutes to see if there was a change
if ((currentUnixTime-previousUnixTime) > interval) {
// Keep track of the time we took the temperature sample
previousUnixTime = currentUnixTime;
// check if the temperate has changed, if not, dont send it.
if (currentTemperatureF != previousTemperatureF) {
// Now they are
previousTemperatureF = currentTemperatureF;
Serial.print("Sending message to topic: "); Serial.println(topic);
Serial.print("Value being sent to topic: "); Serial.println(currentTemperatureF);
printTime(now); // Print current time
// send message, the Print interface can be used to set the message contents
mqttClient.beginMessage(topic);
mqttClient.print(currentTemperatureF);
mqttClient.endMessage();
Serial.println();
}
}
}