Arduino MEGA2560 with Ethernet Shield and MQTT

hello guys,

i´m play around arduino mega ethernet shield , mqtt protocol, since i´have issues i´hope guys can me solve problem.

i work mosquitto in pc make mqtt broker , running, look:

c:\program files (x86)\mosquitto>mosquitto -v
1468107949: mosquitto version 1.4.9 (build date 08/06/2016 11:59:29.51) starting
1468107949: using default config.
1468107949: opening ipv6 listen socket on port 1883.
1468107949: opening ipv4 listen socket on port 1883.
1468107949: new connection 192.168.0.2 on port 1883.
1468107949: new client connected 192.168.0.2 lens_p4trrdv0c3dtmz00jaoxawhqi
cm (c1, k120, u'iotuser').
1468107949: sending connack lens_p4trrdv0c3dtmz00jaoxawhqicm (0, 0)
1468107975: received publish lens_p4trrdv0c3dtmz00jaoxawhqicm (d0, q0, r0, m0,
 'arduino/topic', ... (24 bytes))

i test mqttlens publish 1 message , result succeeded, mqtt protocol working fine!

the problem after grab basic example pubsubclient , work around bit see code not working, not receive message arduino broker.

the code simple, not work well, can fix code put arduino publish , subcribe topic, code:

#include <spi.h>
#include <ethernet.h>
#include <pubsubclient.h>

byte mac[] = {0xde, 0xad, 0xbe, 0xef, 0xfe, 0xed};
ipaddress ip(192, 168, 0, 200);
ipaddress server(192, 168, 0, 2);

void callback(char* topic, byte* payload, unsigned int length)
{
    serial.print("message arrived [");
    serial.print(topic);
    serial.print("] ");
   
    (int i=0;i<length;i++)
    {
        serial.print((char)payload);
    }
  serial.println();
}

ethernetclient ethclient;
pubsubclient client(server, 1883, callback, ethclient);

void setup()
{
     serial.begin(9600); 
     ethernet.begin(mac, ip);

     client.publish("arduino/topic","simple message");
     client.subscribe("arduino/topic");
}

void loop()
{ 
     client.loop();       
}


who missing or wrong?

i change many things code , search lot before request community, ok

thanks in advance

firstly- please use code tags </> post code- makes more readable.


did try run original version here?  version lacks code calls reconnnect() never connected mqtt broker , allows no delay() enable ethernet link established.

if published example code library doesnt work hardware or setup, not problem example code.

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