MQTT Client example program. Ethernet connection is via an ENC28J60 module.
Dependencies: UIPEthernet MQTTClient
Diff: main.cpp
- Revision:
- 0:158b106f3cfc
- Child:
- 1:49fb5754df16
diff -r 000000000000 -r 158b106f3cfc main.cpp --- /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); +}