File content as of revision 0:ae2a45502448:

/* Copyright C2013 Doug Anson, MIT License
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software
 * and associated documentation files the "Software", to deal in the Software without restriction,
 * including without limitation the rights to use, copy, modify, merge, publish, distribute,
 * sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all copies or
 * substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
 * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
 
 #include "MQTTTransport.h"
 
 #include "MBEDEndpoint.h"
 
 // String splitting support
 #include "splitstring.h"
 
 // our transmitt instance 
 MQTTTransport *instance =  NULL;

 // MQTT callback to handle received messages
 void _mqtt_message_handler(char *topic,char *payload,unsigned int length) {
    if (instance != NULL) instance->processMessage((char *)payload,length);
 }
 
 // our MQTT client endpoint
 PubSubClient _mqtt(MQTT_HOSTNAME,MQTT_HOSTPORT,_mqtt_message_handler);
  
 // default constructor
 MQTTTransport::MQTTTransport(ErrorHandler *error_handler) : Transport(error_handler) {
     this->m_mqtt = NULL;
     instance = this;
     this->m_map = new MBEDToIOCResourceMap();
 }
 
 // default destructor
 MQTTTransport::~MQTTTransport() {
     this->disconnect();
     if (this->m_mqtt != NULL) delete this->m_mqtt;
 }
 
 // process a MQTT Message
 void MQTTTransport::processMessage(char *payload, unsigned int len) {
     string message_type;
     string message_name;
     string message_verb;
     string message_value;
     string message_opt;
     MBEDEndpoint *endpoint = (MBEDEndpoint *)this->getEndpoint();

     // DEBUG
     this->logger()->log("MQTT Message: %s length=%d",payload,len);
     
     // split the string by the delimiter
     splitstring str_payload(payload);
     vector<string> data = str_payload.split(':');
     
     // format of the MQTT message:   message_type:name:verb|Parameter_X:value|keyword:optional_data
     if (data.size() > 0) message_type = data[0];
     if (data.size() > 1) message_name = data[1];
     if (data.size() > 2) message_verb = data[2];
     if (data.size() > 3) message_value = data[3];
     if (data.size() > 4) message_opt = data[4];
     
     // load endpoints
     if (strcmp(message_type.c_str(),"endpoint") == 0) {
         if (strcmp(message_name.c_str(),"all") == 0) {
             if (strcmp(message_verb.c_str(),"load") == 0) {
                 // load up our endpoint
                 endpoint->loadEndpoint();
             }
             if (strcmp(message_verb.c_str(),"update") == 0) {
                 // update our endpoint
                 endpoint->updateEndpoint();
             }
         }
         else {
             // destined for our lights?
             int index = endpoint->indexOfLight((char *)message_name.c_str());
             if (index >= 0) {
                 if (strcmp(message_verb.c_str(),"update") == 0) {
                     // update our endpoint
                     endpoint->updateEndpoint();
                 }
             }
         }
     }
     
     // change a resource value
     if (strcmp(message_type.c_str(),"change") == 0) {
         // destined for our lights?
         int index = endpoint->indexOfLight((char *)message_name.c_str());
         if (index >= 0) {
             // map the parameter to one of ours
             char *mapped_resource = this->mapEndpointResourceToIOCResource((char *)message_verb.c_str());
             if (mapped_resource != NULL) {
                 ResourceFactory *factory = endpoint->getResources(index);
                 factory->setResourceValue((char *)message_name.c_str(),(char *)message_value.c_str());
             }
         }
     }
     
     // get a resource value
     if (strcmp(message_type.c_str(),"get") == 0) {
         // destined for our lights?
         int index = endpoint->indexOfLight((char *)message_name.c_str());
         if (index >= 0) {
             // map the parameter to one of ours
             char *mapped_resource = this->mapEndpointResourceToIOCResource((char *)message_verb.c_str());
             if (mapped_resource != NULL) {
                 ResourceFactory *factory = endpoint->getResources(index);
                 char *resource_value = factory->getResourceValue((char *)message_name.c_str());
                 
                 // end the resource value back over MQTT
                 this->sendResourceValue((char *)message_name.c_str(),(char *)message_verb.c_str(),resource_value);
             }
         }
     }
 }
 
 void MQTTTransport::sendResourceValue(char *endpoint_name,char *parameter_name,char *value) {
 }
 
 char *MQTTTransport::mapEndpointResourceToIOCResource(char *ioc_name) {
     return this->m_map->getMBEDMappedName(ioc_name);
 }
 
 char *MQTTTransport::makeID(char *id_template,char *buffer) {
     srand(time(0));
     srand(rand());
     sprintf(buffer,id_template,rand()%MQTT_MAXID_VALUE);
     return buffer;
 }
 
 // connect up MQTT
 bool MQTTTransport::connect() {
     char mqtt_id[MQTT_ENDPOINT_IDLEN+1];
     memset(mqtt_id,0,(MQTT_ENDPOINT_IDLEN+1));
     if (this->m_connected == false) {
         this->logger()->log("MQTT Init: %s:%d...",MQTT_HOSTNAME,MQTT_HOSTPORT);
         this->m_mqtt = &_mqtt;
         if (this->m_mqtt != NULL) {
             char *id = this->makeID(MQTT_ENDPOINT_ID,mqtt_id);
             this->logger()->log("MQTT Connect: ID: %s...",id);
             if (this->m_mqtt->connect(id)) {
                 this->logger()->log("MQTT Subscribe: Topic: %s...",MQTT_IOC_TOPIC);
                 if (this->m_mqtt->subscribe(MQTT_IOC_TOPIC)) {
                     this->logger()->log("MQTT CONNECTED.");
                     this->m_connected = true;
                 }
                 else {
                     this->logger()->log("MQTT Subscribe: Topic: %s FAILED",MQTT_IOC_TOPIC);
                     this->logger()->turnLEDRed();
                 }
             }
             else {
                 this->logger()->log("MQTT Connect: ID: %s FAILED",id);
                 this->logger()->turnLEDRed();
             }
         }
         else {
             this->logger()->log("MQTT Unable to allocate new instance");
             this->logger()->turnLEDRed();
         }
     }
     else {
         this->logger()->log("MQTT already connected (OK)");
     }
     return this->m_connected;
 }
 
 // disconnect from MQTT
 bool MQTTTransport::disconnect() {
     if (this->m_mqtt != NULL) {
         this->logger()->log("MQTT Unsubscribing from: %s...",MQTT_IOC_TOPIC);
         this->m_mqtt->unsubscribe(MQTT_IOC_TOPIC);
         this->logger()->log("MQTT Disconnecting...");
         this->m_mqtt->disconnect();
     }
     else {
         this->logger()->log("MQTT already disconnected (OK)");
     }
     this->m_connected = false;
     return true;
 }
 
 // check transport and process stuff
 void MQTTTransport::checkAndProcess() {
     if (this->m_mqtt != NULL && this->m_connected == true) {
         this->m_mqtt->loop();
         this->logger()->blinkMQTTTransportRxLED();
     }
 }