Diff: main.cpp

Revision:

0:9796509d718e

Child:

1:9caf46f4ed3e

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Wed Feb 10 18:39:26 2016 +0000
@@ -0,0 +1,157 @@
+#include "mbed.h"
+#include "MQTTClient.h"
+#include "MQTTEthernet.h"
+#include "rtos.h"
+#include "k64f.h"
+
+// connect options for MQTT broker
+#define BROKER "broker.mqttdashboard.com"   // MQTT broker URL
+#define PORT 1883                           // MQTT broker port number
+#define CLIENTID ""                         // 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 ""                            // MQTT topic
+
+Queue<uint32_t, 6> messageQ;
+
+// 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() {
+    // turn off LED  
+    controlLED(off);
+    
+    // set SW2 and SW3 to generate interrupt on falling edge 
+    switch2.fall(&sw2_ISR);
+    switch3.fall(&sw3_ISR);
+    
+    pc.printf("\r\n\r\nWelcome to the K64F MQTT Demo!\r\n");
+    pc.printf("\r\nAttempting connect to local network...\r\n");
+        
+    // initialize ethernet interface
+    MQTTEthernet ipstack = MQTTEthernet();
+    
+    // get and display client network info
+    EthernetInterface& eth = ipstack.getEth();
+    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());
+    
+    // construct the MQTT client
+    MQTT::Client<MQTTEthernet, Countdown> client = MQTT::Client<MQTTEthernet, Countdown>(ipstack);
+    
+    char* hostname = BROKER;
+    int port = PORT;
+    int rc;
+    
+    pc.printf("\r\nAttempting TCP connect to %s:%d:  ", hostname, port);
+    
+    // connect to TCP socket and check return code
+    if ((rc = ipstack.connect(hostname, port)) != 0)
+        pc.printf("failed: rc= %d\r\n", rc);
+        
+    else
+        pc.printf("success\r\n");
+    
+    MQTTPacket_connectData data = MQTTPacket_connectData_initializer;       
+    data.MQTTVersion = 3;
+    data.clientID.cstring = CLIENTID;
+//    data.username.cstring = USERNAME;
+//    data.password.cstring = PASSWORD;
+    
+    // send MQTT connect packet and check return code
+    pc.printf("Attempting MQTT connect to %s:%d: ", hostname, port);
+    if ((rc = client.connect(data)) != 0)
+        pc.printf("failed: rc= %d\r\n", rc);
+        
+    else
+        pc.printf("success\r\n");
+        
+    char* topic = TOPIC;
+    
+    // subscribe to MQTT topic
+    pc.printf("Subscribing to MQTT topic %s: ", topic);
+    if ((rc = client.subscribe(topic, MQTT::QOS0, messageArrived)) != 0)
+        pc.printf("failed: rc= %d\r\n", rc);
+        
+    else
+        pc.printf("success\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\r\n", message.payloadlen, (char*)message.payload);
+            rc = client.publish(topic, message);
+            client.yield(100);
+        }
+        
+        else {
+            client.yield(100);
+        }           
+    }
+}