Hello,
I installed mosquitto as a Broker on my lokal Windows (because I dont have a Pi atm). Now I connected my Arduino with Ethernetshield 2 via an Adapter to my pc. I changed the mosquitto.conf with following lines “allow_anonymous true”, “per_listener_settings true”, “listener 1884” and “bind_address 192.168.xx.x”. Everything works fine with the localhost. With the MQTT Explorer its visable that I can creat a new topic via cmd. I created a pw and username for my mosquitto broker.
Now to my Problem: The Arduino cant get a connection to the Broker. (Attempting MQTT connection…failed, rc=-2) Trying to change the Ports didnt help me out. Looking to Wireshark it says:
189 42.349355 192.168.xx.3 192.168.xx.2 TCP 60 [TCP Retransmission] [TCP Port numbers reused] 49247 → 1883 [SYN] Seq=0 Win=2048 Len=0 MSS=1460
but no more data to this port or from this ip.
Is it possible that my Windows blocks more data or that I need to configure the port?
My Arduino Code:
/*
Basic MQTT example
This sketch demonstrates the basic capabilities of the library.
It connects to an MQTT server then:
- publishes “hello world” to the topic “outTopic”
- subscribes to the topic “inTopic”, printing out any messages
it receives. NB - it assumes the received payloads are strings not binary
It will reconnect to the server if the connection is lost using a blocking
reconnect function. See the ‘mqtt_reconnect_nonblocking’ example for how to
achieve the same result without blocking the main loop.
*/
#include <SPI.h>
#include <Ethernet.h>
#include <PubSubClient.h>
// Update these with values suitable for your network.
byte mac[] = { 0xDE, 0xED, 0xBA, 0xFE, 0xFE, 0xED };
IPAddress ip(192, 168, xx, 3);
IPAddress server(192, 168, xx, 2);
void callback(char* topic, byte* payload, unsigned int length) {
Serial.print("Message arrived [");
Serial.print(topic);
Serial.print("] ");
for (int i=0;i<length;i++) {
Serial.print((char)payload[i]);
}
Serial.println();
}
EthernetClient ethClient;
PubSubClient client(ethClient);
void reconnect() {
// Loop until we're reconnected
while (!client.connected()) {
Serial.print("Attempting MQTT connection...");
// Attempt to connect
if (client.connect("arduinoClient", "client", "test")) {
Serial.println("connected");
// Once connected, publish an announcement...
client.publish("outTopic","hello world");
// ... and resubscribe
client.subscribe("inTopic");
} else {
Serial.print("failed, rc=");
Serial.print(client.state());
Serial.println(" try again in 5 seconds");
// Wait 5 seconds before retrying
delay(5000);
}
}
}
void setup()
{
Serial.begin(9600);
client.setServer(server, 1883);
client.setCallback(callback);
Ethernet.begin(mac, ip);
// Allow the hardware to sort itself out
delay(1500);
}
void loop()
{
if (!client.connected()) {
reconnect();
}
client.loop();
}
I am new to mosquitto and MQTT so I am thankfull for everyone who can help me.
Thank you!