Problems connecting to MQTT with username and password

Projects Networking, Protocols, and Devices
1

I'm hoping this is something simple that I'm just not understanding. I'm trying to wrap my mind around both ethernet and mqtt on arduino. I've used them separately, but I can get a lot of raspberry pi's out of the way if I can publish mqtt messages directly from the arduino.

I have a nano with the nano arduino shield. I can publish messages to my local network (192.168.0.222) with no password on port 1883.

I can publish messages to my private server which is on the public internet from a raspberry pi (so I definitely know the password, ip addresses etc).

However, I can't figure out how to publish messages from the arduino when I need a username and password. Here's my local sketch...

#include <UIPEthernet.h>
#include "PubSubClient.h"


#define CLIENT_ID       "BoilerRoom"


#define INTERVAL        15000 // 15 sec delay between publishing
uint8_t mac[6] = {0x00,0x01,0x02,0x03,0x04,0x05};

EthernetClient ethClient;
PubSubClient mqttClient;

long previousMillis;

void setup() {

  // setup serial communication
  Serial.begin(9600);
  // setup ethernet communication using DHCP
  if(Ethernet.begin(mac) == 0) {
    Serial.println(F("Ethernet configuration using DHCP failed"));
    for(;;);
  }
  // setup mqtt client
  mqttClient.setClient(ethClient);
  mqttClient.setServer("192.168.0.222",1883);
  Serial.println(F("MQTT client configured"));

  previousMillis = millis();
}

void loop() {
  // check interval
  if(millis() - previousMillis > INTERVAL) {
    sendData();
    previousMillis = millis();
  }
  mqttClient.loop();
}

void sendData() {
  char msgBuffer[20];

  if(mqttClient.connect(CLIENT_ID)) {
   mqttClient.publish("boilerTemp", "5000");
   Serial.println(F("Attempted to send temp"));
   

 }else{
     Serial.println(F("Failed"));
 }
}

Looking at the documentation, I was assuming I could change port 1883 to 8883 and change this line...

  if(mqttClient.connect(CLIENT_ID)) {

to

  if(mqttClient.connect(CLIENT_ID, "myUsername", "myPassword")) {

but that doesn't seem to be working. Can anyone help?

2

Did you try activating authentication on your local server and sending messages there? I don't know your network, it might be possible that the Arduino isn't able to connect to the remote server (that's necessary before the authentication).