File content as of revision 4:4e31afefdf81:

//#define MQTT_DEBUG

#include "mbed.h"
#include "MQTTClient.h"
#include "MQTTFormat.h"

//#include "MQTTEthernet.h"
#include "MQTTWNCInterface.h"
#include "rtos.h"
#include "k64f.h"


// connect options for MQTT broker
#define BROKER "broker.hivemq.com"   // MQTT broker URL
#define PORT 1883                           // MQTT broker port number
#define CLIENTID "96430312d8f7"                         // use K64F MAC address without colons
#define USERNAME ""                         // not required for MQTT Dashboard public broker 
#define PASSWORD ""                         // not required for MQTT Dashboard public broker
#define TOPIC "jmf/Test1"                            // MQTT topic

Queue<uint32_t, 6> messageQ;
MODSERIAL pc(USBTX,USBRX,256,256);
    
struct rcvd_errs{
    int err;
    char *er;
    };
    
rcvd_errs response[] = {
    200, "200 OK - Request has succeeded.",
    201, "201 Created - Request has been fulfilled and a new resource created.",
    202, "202 Accepted - The request has been accepted for processing, but the processing will be completed asynchronously",
    204, "204 No Content - The server has fulfilled the request but does not need to return an entity-body.",
    400, "400 Bad Request - Bad request (e.g. sending an array when the API is expecting a hash.)",
    401, "401 Unauthorized - No valid API key provided.",
    403, "403 Forbidden - You tried to access a disabled device, or your API key is not allowed to access that resource, etc.",
    404, "404 Not Found - The requested item could not be found.",
    405, "405 Method Not Allowed - The HTTP method specified is not allowed.",
    415, "415 Unsupported Media Type - The requested media type is currently not supported.",
    422, "422 Unprocessable Entity - Can result from sending invalid fields.",
    429, "429 Too Many Requests - The user has sent too many requests in a given period of time.",
    500, "500 Server errors - Something went wrong in the M2X server",
    502, "502 Server errors - Something went wrong in the M2X server",
    503, "503 Server errors - Something went wrong in the M2X server",
    504, "504 Server errors - Something went wrong in the M2X server",
    };
#define RCMAX   sizeof(response)/sizeof(rcvd_errs)

char * response_str(int rc) {
    static char *unkown = "Unknown error code...";
    int i=0;
    while( response[i].err != rc && i < RCMAX)
        i++;
    return (i<RCMAX? response[i].er : unkown);
}

// LED color control function
void controlLED(color_t led_color) {
    switch(led_color) {
        case red :
            greenLED = blueLED = 1;          
            redLED = 0.7;
            break;
        case green :
            redLED = blueLED = 1;
            greenLED = 0.7;
            break;
        case blue :
            redLED = greenLED = 1;
            blueLED = 0.7;
            break;
        case off :
            redLED = greenLED = blueLED = 1;
            break;
    }
}
    
// Switch 2 interrupt handler
void sw2_ISR(void) {
    messageQ.put((uint32_t*)22);
}

// Switch3 interrupt handler
void sw3_ISR(void) {
    messageQ.put((uint32_t*)33);
}
 
// MQTT message arrived callback function
void messageArrived(MQTT::MessageData& md) {
    MQTT::Message &message = md.message;
    pc.printf("Receiving MQTT message:  %.*s\r\n", message.payloadlen, (char*)message.payload);
    
    if (message.payloadlen == 3) {
        if (strncmp((char*)message.payload, "red", 3) == 0)
            controlLED(red);
        
        else if(strncmp((char*)message.payload, "grn", 3) == 0)
            controlLED(green);
        
        else if(strncmp((char*)message.payload, "blu", 3) == 0)
            controlLED(blue);
        
        else if(strncmp((char*)message.payload, "off", 3) == 0)
            controlLED(off);
    }        
}

int main() {
    int rc, good = 0;
    Timer tmr;
    char* topic = TOPIC;
    // turn off LED  
    controlLED(blue);

    pc.baud(115200);
    pc.printf("\r\n\r\nWelcome to the K64F MQTT Demo!\r\n");
        
    // set SW2 and SW3 to generate interrupt on falling edge 
    switch2.fall(&sw2_ISR);
    switch3.fall(&sw3_ISR);

    // initialize ethernet interface
    MQTTwnc ipstack = MQTTwnc();
    
    // get and display client network info
    WNCInterface& eth = ipstack.getEth();
    
    // construct the MQTT client
    MQTT::Client<MQTTwnc, Countdown> client = MQTT::Client<MQTTwnc, Countdown>(ipstack);
    
    char* hostname = BROKER;
    int port = PORT;

    pc.printf("\r\nConnected to local network...\r\n");    
    pc.printf("IP address is %s\r\n", eth.getIPAddress());
    pc.printf("MAC address is %s\r\n", eth.getMACAddress());
    pc.printf("Gateway address is %s\r\n", eth.getGateway());

    MQTTPacket_connectData data = MQTTPacket_connectData_initializer;       
    int tries;
    
    while( !good ) {    
        tries=0;
        // connect to TCP socket and check return code
        tmr.start();
        rc = 1;
        while( rc && tries < 3) {
            pc.printf("\r\n\r\nAttempting TCP connect to %s:%d:  ", hostname, port);
            rc = ipstack.connect(hostname, port);
            if( rc ) {
                pc.printf("Failed!!\r\n");
                while( tmr.read_ms() < 5000 ) ;
                tries++;
                tmr.reset();
            }
            else {
                pc.printf("Success!\r\n");
                rc = 0;
            }
        }
    
        data.MQTTVersion = 3;
        data.clientID.cstring = eth.getMACAddress();
    //    data.username.cstring = USERNAME;
    //    data.password.cstring = PASSWORD;
        
        // send MQTT connect packet and check return code
        rc = 1;
        tmr.reset(); 
        while( !client.isConnected() && rc && tries < 3) {
            pc.printf("Attempting (%d) MQTT connect to %s:%d: ", tries, hostname, port);
            rc = client.connect(data);
            if( rc ) {
                pc.printf("Connection Failed!\r\n");
                while( tmr.read_ms() < 5000 );
                tmr.reset();
                tries++;
            }
            else
                pc.printf("Connected!\r\n");
        }

        // subscribe to MQTT topic
        tmr.reset();
        rc = 1;
        while( rc && client.isConnected() && tries < 3) {
            pc.printf("We are %s, Subscribing to MQTT topic %s (%d): ", client.isConnected()?"connected":"NOT CONNECTED",topic,tries);
            rc = client.subscribe(topic, MQTT::QOS0, messageArrived);
            if( rc ) {
                pc.printf("Subscribe request failed!\r\n");
                while( tmr.read_ms() < 5000 );
                tries++;
                tmr.reset();
            }
            else {
                good=1;
                pc.printf("Subscribe successful!\r\n");
            }
        }
    }        
    
    MQTT::Message message;
    char buf[100];
    message.qos = MQTT::QOS0;
    message.retained = false;
    message.dup = false;
    message.payload = (void*)buf;
    message.payloadlen = strlen(buf)+1;
    
    while(true) {
        osEvent switchEvent = messageQ.get(100);
        
        if (switchEvent.value.v == 22 || switchEvent.value.v == 33) {
            switch(switchEvent.value.v) {
                case 22 :
                    sprintf(buf, "sw2");
                    break;
                case 33 :
                    sprintf(buf, "sw3");
                    break;
            }
            pc.printf("Publishing MQTT message: %s (%d)\r\n", (char*)message.payload,
                       message.payloadlen);
            rc = client.publish(topic, message);
            if( rc ) {
                pc.printf("Publish request failed! (%d)\r\n",rc);
            }
            else {
                pc.printf("Publish successful!\r\n");            
            client.yield(100);
            }
        }
        else {
            client.yield(100);
        }           
    }
}