MQTT Basic

Projects Libraries
1

Hi friends
I am working on MQTT basic program since two days
//*******#have hardware with connections as below (executed server program successfully with same connections)
|PC| <--USB cable-->|Arduino Nano|<--(jumper wires)-->|ENC28J60 shield|<--Ethernet Cable-->|Ethernet Switch|
PC IP: 192.168.0.114 / windows

//**********#software
#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 };
byte server[] = { 192, 168, 0, 110 };
byte ip[] = { 192, 168, 0, 222 };

void callback(char* topic, byte* payload, unsigned int length) {
// handle message arrived
}

EthernetClient ethClient;
PubSubClient client(server, 1883, callback, ethClient);

void setup()
{
Ethernet.begin(mac, ip);
if (client.connect("arduinoClient")) {
client.publish("outTopic","hello world");
client.subscribe("inTopic");
}
}
void loop()
{
client.loop();
}
//*********Code ends

I have loaded the code into Arduino Nano,

to publish / subscribe the messages im getting the problem:

(unable to install WMQTT utility which was suggested by blog )

2

(deleted)

3

spycatcher2k:
This does not make sense :

Hi - i've bought stuff and don't know what i'm building. Teach me everything I need to know to program a PC and an Arduino, and then tell me everything I can do!

Normally, I get an Idea, plan it, find the hardware, write the firmware, and if I get stuck or don't understand something, then I ask about that specific point.

Dear Friend,

  • Plan is to publish , subscribe the data with "Nano+Ethernet shield"
  • As mentioned above i have done my hardware & wiring connections
  • firmware uploaded successfully into Nano
  • Problem is , where to publish & subscribe (trying to install WMQTT utility, but its not working)

Thanks in advance