Diff: main.cpp

Revision:

0:158b106f3cfc

Child:

1:49fb5754df16

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Mon Sep 15 12:51:58 2014 +0000
@@ -0,0 +1,97 @@
+// In this example an MQTT client is created using an ENC28J60 chip/board
+// It is publishing a simple 'example/hello' message 'Hello World.'
+// and subscribes to 'outdoor/temperature' messages
+// UIPEthernet library is used to drive the ENC28J60
+#include "mbed.h"
+#include <UIPEthernet.h>
+#include <UIPClient.h>
+#include <MQTTClient.h>
+#include <string>
+
+using namespace std;
+
+// UIPEthernet is the name of a global instance of UIPEthernetClass.
+// Do not change the name! It is used within the UIPEthernet library.
+// Adapt the SPI pin names to your mbed platform/board if not present yet.
+#if defined(TARGET_LPC1768)
+UIPEthernetClass UIPEthernet(p11, p12, p13, p8); // mosi, miso, sck, cs
+#elif defined(TARGET_LPC1114)
+UIPEthernetClass UIPEthernet(dp2, dp1, dp6, dp25); // mosi, miso, sck, cs
+#elif defined(TARGET_LPC11U68)
+UIPEthernetClass UIPEthernet(P0_9, P0_8, P1_29, P0_2); // mosi, miso, sck, cs
+#elif defined (TARGET_NUCLEO_F103RB)
+UIPEthernetClass UIPEthernet(PB_5, PB_4, PB_3, PB_6); // mosi, miso, sck, cs
+#endif
+
+Serial pc(PA_9, PA_10);
+
+// Make sure that the MAC number is unique within the connected network.
+const uint8_t    MY_MAC[6] = {0x00,0x01,0x02,0x03,0x04,0x05};
+// IP address must be unique and compatible with your network too. Change as appropriate.
+const IPAddress  MY_IP(192,168,1,181);
+char             message_buff[100];
+void             onMqttMessage(char* topic, uint8_t* payload, unsigned int length);
+IPAddress        serverIP(192,168,1,30);     // MQTT server (e.g. 'mosquitto' running on a Ubuntu PC or Raspberry Pi)
+EthernetClient   ethernetClient;
+MQTTClient       mqttClient(serverIP, 1883, onMqttMessage, ethernetClient);
+
+int main()
+{
+    const int   MAX_COUNT = 5;
+    int         i = 0;
+    bool        connected = false;
+    char*       payload = "Hello World.";
+    time_t      t = 0;
+    time_t      lastTime = t;
+
+    // initialize the ethernet device
+    Ethernet.begin(MY_MAC, MY_IP);
+//    IPAddress localIP = Ethernet.localIP();
+//    pc.printf("IP = ");
+//    for(uint8_t i = 0; i < 3; i++)
+//        pc.printf("%d.", localIP[i]);
+//    pc.printf("%d\r\n", localIP[3]);
+    pc.printf("Connecting to MQTT server ..\r\n");
+    do {
+        wait(1.0);
+        connected = mqttClient.connect("myMQTTHelloClient");
+    } while(!connected && (i < MAX_COUNT));
+
+    if(connected) {
+        pc.printf("MQTT Server connected.\r\n");
+        mqttClient.subscribe("outdoor/temperature");
+        pc.printf("Subscribed to: outdoor/temperature\r\n");
+    } else {
+        pc.printf("Failed to connect to MQTT server.\r\n");
+    }
+
+    while(1) {
+        t = time(NULL);
+        if(t > (lastTime + 5)) {
+            lastTime = t;
+            if(connected) {
+                mqttClient.publish("example/hello", payload);
+                pc.printf("Published: example/hello\r\n");
+            }
+
+        }
+        mqttClient.loop();  // MQTT client loop processing
+    }
+}
+
+void onMqttMessage(char* topic, uint8_t* payload, unsigned int length)
+{
+    int i = 0;
+
+    pc.printf("Message arrived:\r\n");
+    pc.printf("  Topic: %s\r\n", topic);
+    pc.printf("  Length: %d\r\n", length);
+
+    // create character buffer with ending null terminator (string)
+    for(i = 0; i < length; i++) {
+        message_buff[i] = payload[i];
+    }
+
+    message_buff[i] = '\0';
+    pc.printf("  Payload: %s\r\n", message_buff);
+}