MQTT über Ethernet Shield W5100

[JanS]

Hallo zusammen, ich versuche im Moment mein Arduino Uno, mithilfe eines W5100, mit einem Mosquitto Broker auf meinem Windows Pc zu verbinden. Wenn ich aber versuche die Verbindung aufzubauen erscheint nur ein Verbindungsfehler (state: -2). Vielleicht weiß ja einer von euch, was für ein Fehler ich bei den IP Adressen gemacht habe und welche ich verwenden muss. Vielen Dank im Vorraus
Mein Code:
#include <SPI.h>
#include <Ethernet.h>
#include <PubSubClient.h>
#include <DHT.h>

#define ARDUINO_CLIENT_ID “arduino_1” // Client ID for Arduino pub/sub
#define PUB_TEMP “arduino_1/sensor/temperature_celsius” // MTTQ topic for temperature [C]
#define PUB_HUMID “arduino_1/sensor/humidity” // MTTQ topic for humidity
#define SUB_LED “arduino_1/led” // MTTQ topic for LED
#define PUBLISH_DELAY 3000 // Publishing delay [ms]

// Hardware setup details
const int ledPin = 3;
const int sensorPin = 5;
const int sensorType = DHT11;

// Networking details
byte mac[] = { 0xDE, 0xED, 0xBA, 0xFE, 0xFE, 0xED }; // Ethernet shield (W5100) MAC address
IPAddress ip(192, 168, 0, 106); // Ethernet shield (W5100) IP address
IPAddress server(192,106,0,102); // MTTQ server IP address

DHT dht(sensorPin, sensorType);
EthernetClient ethClient;
PubSubClient client(ethClient);

long previousMillis;

void setup()
{
Serial.begin(9600);

// LED off
pinMode(ledPin, OUTPUT);
digitalWrite(ledPin, LOW);

// MTTQ parameters
client.setServer(server, 1883);
client.setCallback(callback);

// Ethernet shield configuration
Ethernet.begin(mac, ip);

delay(1500); // Allow hardware to stabilize

previousMillis = millis();
}

void loop()
{
if (!client.connected())
reconnect();

if (millis() – previousMillis > PUBLISH_DELAY)
{
previousMillis = millis();
float humidity = dht.readHumidity(); // humidity
float tempC = dht.readTemperature(); // temperature [C]
char tmpBuffer[20];

// check if any reads failed and exit early (to try again).
if (isnan(humidity) || isnan(tempC))
{
Serial.println(“error reading sensor data”);
return;
}
else
{
Serial.print(“[sensor data] temperature[C]: “);
Serial.print(tempC);
Serial.print(“, humidity: “);
Serial.println(humidity);

client.publish(PUB_TEMP, dtostrf(tempC, 6, 2, tmpBuffer));
client.publish(PUB_HUMID, dtostrf(humidity, 6, 2, tmpBuffer));
}
}

client.loop();
}

void reconnect()
{
// Loop until reconnected
while (!client.connected()) {
Serial.print(“Attempting MQTT connection … “);
// Attempt to connect
if (client.connect(ARDUINO_CLIENT_ID)) {
Serial.println(“connected”);
// (re)subscribe
client.subscribe(SUB_LED);
} else {
Serial.print(“Connection failed, state: “);
Serial.print(client.state());
Serial.println(“, retrying in 5 seconds”);
delay(5000); // Wait 5 seconds before retrying
}
}
}

// sub callback function
void callback(char* topic, byte* payload, unsigned int length)
{
Serial.print(“[sub: “);
Serial.print(topic);
Serial.print(“] “);
char message[length + 1] = “”;
for (int i = 0; i < length; i++)
message[i] = (char)payload[i];
message[length] = ‘\0’;
Serial.println(message);

// SUB_LED topic section
if (strcmp(topic, SUB_LED) == 0)
{
if (strcmp(message, “on”) == 0)
digitalWrite(ledPin, HIGH);
if (strcmp(message, “off”) == 0)
digitalWrite(ledPin, LOW);
}
}

[Stefan Hermann]

Hm, komplexes Problem, aber kann es sein, dass du dich einfach bei der IP vertippt hast? Also statt:

IPAddress ip(192, 168, 0, 106); // Ethernet shield (W5100) IP address
IPAddress server(192,106,0,102); // MTTQ server IP address

Das hier verwenden:

IPAddress ip(192, 168, 0, 106); // Ethernet shield (W5100) IP address
IPAddress server(192,168,0,102); // MTTQ server IP address

Kommt mir komisch vor, dass die IP vom Server 192.106.0.102 sein soll. Ich hoffe, das war es, sonst wird es schwierig :-)

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[Autor]

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