File content as of revision 17:b89d884eb609:

#ifndef __SIMPLEMQTT_H__
#define __SIMPLEMQTT_H__

/***************************************************************
 * Includes
 ***************************************************************/
#include "easy-connect.h"
#include "MQTTClient.h"
#include "NDefLib/NDefNfcTag.h"
#include "NDefLib/RecordType/RecordURI.h"
#include "MQTTNetwork.h"
#include "MQTTmbed.h"

/***************************************************************
 * Definitions
 ***************************************************************/
 // Configuration values needed to connect to IBM IoT Cloud
#define ORG                 MQTT_ORG_ID             // connect to ORG.internetofthings.ibmcloud.com/ For a registered connection, replace with your org
#define ID                  MQTT_DEVICE_ID          // For a registered connection is your device id
#define AUTH_TOKEN          MQTT_DEVICE_PASSWORD    // For a registered connection is a device auth-token
#define DEFAULT_TYPE_NAME   MQTT_DEVICE_TYPE        // For a registered connection is device type
#define AUTH_METHOD         MQTT_USERNAME

#define TYPE                DEFAULT_TYPE_NAME       // For a registered connection, replace with your type
#define IBM_IOT_PORT        MQTT_PORT

#define MQTT_MAX_PACKET_SIZE    400   
#define MQTT_MAX_PAYLOAD_SIZE   300 

/***************************************************************
 * Variables
 ***************************************************************/
char       *projectName     = "WaterMonitor";
static char id[30]          = ID;               // mac without colons  
static char org[12]         = ORG;        
static char type[30]        = TYPE;
static char auth_token[30]  = AUTH_TOKEN;       // Auth_token is only used in non-quickstart mode
static int  connack_rc      = 0;                // MQTT connack return code
static bool netConnecting   = false;
static bool mqttConnecting  = false;
static bool netConnected    = false;
static bool connected       = false;
static int  retryAttempt    = 0;
static int  connectTimeout  = 1000;
static char subscription_url[MQTT_MAX_PAYLOAD_SIZE];

/***************************************************************
 * Unity function definitions
 ***************************************************************/
/** brief       Callback function when MQTT message arrives
 *  param[in]   msgMQTT
 *  retral      None 
 */ 
void MQTT_SubscribeCallback(MQTT::MessageData & msgMQTT); 

/** brief       Subscribe to a MQTT topic and set the MQTT callback function
 *  param[in]   subscribeTopic Topic to be subscribed
 *  param[in]   client         MQTT client 
 *  retral      returnCode from MQTTClient.h 
 */ 
int MQTT_Subscribe(char *subscribeTopic, MQTT::Client<MQTTNetwork, Countdown, MQTT_MAX_PACKET_SIZE>* client);

/** brief       Connect to the internet then the MQTT network
 *  param[in]   client          MQTT client 
 *  param[in]   mqttNetwork     MQTT network 
 *  param[in]   network         The internet network interface (ethernet, wifi...)
 *  retral      Internet connect result and returnCode from MQTTClient.h 
 */ 
int MQTT_Connect(MQTT::Client<MQTTNetwork, Countdown, MQTT_MAX_PACKET_SIZE>* client, MQTTNetwork *mqttNetwork, NetworkInterface* network);

/** brief       Setup the number of attempt to re-connect to the internet
 *  param[in]   attemptNumber The number of attemp
 */ 
int MQTT_GetConnTimeout(int attemptNumber);
void MQTT_AttemptConnect(MQTT::Client<MQTTNetwork, Countdown, MQTT_MAX_PACKET_SIZE>* client, MQTTNetwork *mqttNetwork, NetworkInterface* network);

/** brief       Connect to the internet then the MQTT network
 *  param[in]   client        MQTT client 
 *  param[in]   inputTime     The time when the data is attempt to be sent 
 *  param[in]   commandID     Sequence number of the frame
 *  param[in]   adcVal_0      The ADC value to be sent
 *  retral      returnCode from MQTTClient.h 
 */
int MQTT_PublishADC(MQTT::Client<MQTTNetwork, Countdown, MQTT_MAX_PACKET_SIZE>* client, time_t inputTime, uint16_t commandID, float adcVal_0);

/***************************************************************
 * Unity function declarations
 ***************************************************************/ 
void MQTT_SubscribeCallback(MQTT::MessageData & msgMQTT) {
    char msg[MQTT_MAX_PAYLOAD_SIZE];
    msg[0]='\0';
    strncat (msg, (char*)msgMQTT.message.payload, msgMQTT.message.payloadlen);
    printf ("--->>> MQTT_SubscribeCallback msg: %s\n\r", msg);
}

int MQTT_Subscribe(char *subscribeTopic, MQTT::Client<MQTTNetwork, Countdown, MQTT_MAX_PACKET_SIZE>* client) {
    return client->subscribe(subscribeTopic, MQTT::QOS1, MQTT_SubscribeCallback);
}

int MQTT_Connect(MQTT::Client<MQTTNetwork, Countdown, MQTT_MAX_PACKET_SIZE>* client, MQTTNetwork *mqttNetwork, NetworkInterface* network) {
    const char* iot_ibm = MQTT_BROKER_URL;     
    char hostname[strlen(org) + strlen(iot_ibm) + 1];
    
    sprintf(hostname, "%s%s", org, iot_ibm);
    // Construct clientId - d:org:type:id
    char clientId[strlen(org) + strlen(type) + strlen(id) + 5];  
    sprintf(clientId, "d:%s:%s:%s", org, type, id);  
    sprintf(subscription_url, "%s.%s/#/device/%s/%s/", org, "internetofthings.ibmcloud.com", id, DEFAULT_TYPE_NAME);

    // Network debug statements 
    LOG("=====================================\n\r");
    LOG("Nucleo IP ADDRESS: %s\n\r", network->get_ip_address());
    LOG("Nucleo MAC ADDRESS: %s\n\r", network->get_mac_address());
    LOG("Server Hostname: %s port: %d\n\r", hostname, IBM_IOT_PORT);
    LOG("Client ID: %s\n\r", clientId);
    LOG("Topic: %s\n\r",MQTT_EVENT_TOPIC);
    LOG("Subscription URL: %s\n\r", subscription_url);
    LOG("=====================================\n\r");    
    netConnecting = true;
    int rc = mqttNetwork->connect(hostname, IBM_IOT_PORT);
    if (rc != 0) {
        printf("rc from TCP connect is %d\r\n", rc);
        return rc;
    }
    
    printf ("--->TCP Connected\n\r");
    netConnected    = true;
    netConnecting   = false;        
        
    // MQTT Connect
    mqttConnecting = true;
    MQTTPacket_connectData data = MQTTPacket_connectData_initializer;
    data.MQTTVersion            = 4;
    data.struct_version         = 0;
    data.clientID.cstring       = clientId; 
    data.keepAliveInterval      = MQTT_KEEPALIVE;  // in Sec   
    data.username.cstring       = AUTH_METHOD;
    data.password.cstring       = auth_token;
    printf ("AutToken: %s\n\r", auth_token);
       
    if ((rc = client->connect(data)) != 0) {
        printf("rc from MQTT connect is %d\r\n", rc);
        connack_rc = rc;
        return rc;
    }
    connected = true;
    printf ("--->MQTT Connected\n\r"); 
    if ((rc = MQTT_Subscribe(MQTT_COMMAND_TOPIC, client)) == 0) { 
        LOG ("--->>>MQTT subscribed to: %s\n\r", MQTT_COMMAND_TOPIC);
    } else {
        LOG ("--->>>ERROR MQTT subscribe : %s\n\r", MQTT_COMMAND_TOPIC);
    }  
    mqttConnecting = false;
    connack_rc = rc;
    return rc;       
}


int MQTT_GetConnTimeout(int attemptNumber) {  // First 10 attempts try within 3 seconds, next 10 attempts retry after every 1 minute
   // after 20 attempts, retry every 10 minutes
    return (attemptNumber < 10) ? 3 : (attemptNumber < 20) ? 60 : 600;
}


void MQTT_AttemptConnect(MQTT::Client<MQTTNetwork, Countdown, MQTT_MAX_PACKET_SIZE>* client, MQTTNetwork *mqttNetwork, NetworkInterface* network) {
    connected = false;
           
    while (MQTT_Connect(client, mqttNetwork, network) != MQTT_CONNECTION_ACCEPTED) {    
        if (connack_rc == MQTT_NOT_AUTHORIZED || connack_rc == MQTT_BAD_USERNAME_OR_PASSWORD) {
            printf ("File: %s, Line: %d Error: %d\n\r",__FILE__,__LINE__, connack_rc);        
            return; // don't reattempt to connect if credentials are wrong
        } 
        int timeout = MQTT_GetConnTimeout(++retryAttempt);
        WARN("Retry attempt number %d waiting %d\n", retryAttempt, timeout);
        
        // if ipstack and client were on the heap we could deconstruct and goto a label where they are constructed
        //  or maybe just add the proper members to do this disconnect and call MQTT_AttemptConnect(...)        
        // this works - reset the system when the retry count gets to a threshold
        if (retryAttempt == 5)
            NVIC_SystemReset(); 
        else
            wait(timeout);
    }    
}

int MQTT_PublishADC(MQTT::Client<MQTTNetwork, Countdown, MQTT_MAX_PACKET_SIZE>* client, time_t inputTime, uint16_t commandID, float adcVal_0) {
    MQTT::Message message;
    const char* pubTopic = MQTT_EVENT_TOPIC;
            
    char buf[MQTT_MAX_PAYLOAD_SIZE];
    char timeBuf[50];

    if (!client->isConnected()) { 
        printf ("---> MQTT DISCONNECTED\n\r"); return MQTT::FAILURE; 
    }
    
    strftime(timeBuf, 50, "%Y/%m/%d %H:%M:%S", localtime(&inputTime));
    sprintf(buf,
     "{\"Project\":\"%s\",\"Time\":\"%s\",\"Type\":1,\"cmdID\":%d,\"ADC0\":%0.2f}",
              projectName, timeBuf, commandID, adcVal_0);
    message.qos        = MQTT::QOS0;
    message.retained   = false;
    message.dup        = false;
    message.payload    = (void*)buf;
    message.payloadlen = strlen(buf);

    if((message.payloadlen + strlen(pubTopic)+1) >= MQTT_MAX_PACKET_SIZE)
        printf("message too long!\r\n");
    
    LOG("Publishing %s\n\r", buf);
    return client->publish(pubTopic, message);    
}
#endif /* __SIMPLEMQTT_H__ */