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MQTT Client for mbed LPC1768 and Application Board over Ethernet; publish only.
Dependencies: C12832 MMA7660 MQTT
Fork of HelloMQTT by
Machine-to-Machine-Communication
Das Message Queue Telemetry Transport (MQTT) Protokoll ist ein effizientes Internet of Things (IoT) Protokoll mit wenig Protokolloverhead. Es wurde als lightweight publish/subscribe messaging transport entworfen. Es ist sinnvoll für Verbindungen mit Remote-Standorten, wo nur wenig Resourcen benötigt werden bzw. geringe Bandbreite zur Verfügung steht. Neben MQTT gibt es weitere IoT-Protokoll, wie HTTP, CoAP, XMPP, ... (Überischt über IoT Protokolle). Eine Beschreibung des MQTT ist z.B. hier zu finden.
MQTT implementiert das Publish/Subscribe-Pattern, daher wird ein Brocker für die Vermittlung der Nachrichten (topics) benötigt. Neben vielen quelloffenen Implementierungen (z. B. mosquitto) gibt es auch kommerzielle bzw. freie Server (Broker), die unterschiedliche Features bereit stellen (z. B. den in Deutschland entwickelten HiveMQ).
Für die Programmierung der Clients bzw. Ebedded Systems stehen ebenso sehr viele Libaries in verschiedenen Programmiersprachen zur Verfügung.
Weitere Kommunikationsmöglichkeiten
Diff: main.cpp
- Revision:
- 20:49c9daf2b0ff
- Parent:
- 19:7f7aba7a4a8b
- Child:
- 21:4b8d80bf664f
--- a/main.cpp Thu Jul 30 13:49:18 2015 +0000 +++ b/main.cpp Tue Jan 10 18:10:17 2017 -0600 @@ -14,7 +14,7 @@ * Ian Craggs - initial API and implementation and/or initial documentation * Ian Craggs - make sure QoS2 processing works, and add device headers *******************************************************************************/ - + /** This is a sample program to illustrate the use of the MQTT Client library on the mbed platform. The Client class requires two classes which mediate @@ -22,33 +22,31 @@ classes provide the required public programming interfaces, it does not matter what facilities they use underneath. In this program, they use the mbed system libraries. - + */ - + // change this to 0 to output messages to serial instead of LCD #define USE_LCD 1 #if USE_LCD #include "C12832.h" -#if defined(TARGET_UBLOX_C027) -#warning "Compiling for mbed C027" -#include "C027.h" -#elif defined(TARGET_LPC1768) -#warning "Compiling for mbed LPC1768" -#include "LPC1768.h" -#elif defined(TARGET_K64F) -#warning "Compiling for mbed K64F" -#include "K64F.h" -#endif +// the actual pins are defined in mbed_app.json and can be overridden per target +C12832 lcd(LCD_MOSI, LCD_SCK, LCD_MISO, LCD_A0, LCD_NCS); -#define printf lcd.cls();lcd.printf +#define logMessage lcd.cls();lcd.printf + +#else + +#define logMessage printf #endif #define MQTTCLIENT_QOS2 1 -#include "MQTTEthernet.h" +#include "easy-connect.h" +#include "MQTTNetwork.h" +#include "MQTTmbed.h" #include "MQTTClient.h" int arrivedcount = 0; @@ -57,45 +55,51 @@ void messageArrived(MQTT::MessageData& md) { MQTT::Message &message = md.message; - printf("Message arrived: qos %d, retained %d, dup %d, packetid %d\n", message.qos, message.retained, message.dup, message.id); - printf("Payload %.*s\n", message.payloadlen, (char*)message.payload); + logMessage("Message arrived: qos %d, retained %d, dup %d, packetid %d\r\n", message.qos, message.retained, message.dup, message.id); + logMessage("Payload %.*s\r\n", message.payloadlen, (char*)message.payload); ++arrivedcount; } int main(int argc, char* argv[]) -{ - MQTTEthernet ipstack = MQTTEthernet(); - float version = 0.5; +{ + float version = 0.6; char* topic = "mbed-sample"; - - printf("HelloMQTT: version is %f\n", version); - - MQTT::Client<MQTTEthernet, Countdown> client = MQTT::Client<MQTTEthernet, Countdown>(ipstack); - - char* hostname = "m2m.eclipse.org"; + + logMessage("HelloMQTT: version is %.2f\r\n", version); + + NetworkInterface* network = easy_connect(true); + if (!network) { + return -1; + } + + MQTTNetwork mqttNetwork(network); + + MQTT::Client<MQTTNetwork, Countdown> client = MQTT::Client<MQTTNetwork, Countdown>(mqttNetwork); + + const char* hostname = "m2m.eclipse.org"; int port = 1883; - printf("Connecting to %s:%d\n", hostname, port); - int rc = ipstack.connect(hostname, port); + logMessage("Connecting to %s:%d\r\n", hostname, port); + int rc = mqttNetwork.connect(hostname, port); if (rc != 0) - printf("rc from TCP connect is %d\n", rc); - - MQTTPacket_connectData data = MQTTPacket_connectData_initializer; + logMessage("rc from TCP connect is %d\r\n", rc); + + MQTTPacket_connectData data = MQTTPacket_connectData_initializer; data.MQTTVersion = 3; data.clientID.cstring = "mbed-sample"; data.username.cstring = "testuser"; data.password.cstring = "testpassword"; if ((rc = client.connect(data)) != 0) - printf("rc from MQTT connect is %d\n", rc); - + logMessage("rc from MQTT connect is %d\r\n", rc); + if ((rc = client.subscribe(topic, MQTT::QOS2, messageArrived)) != 0) - printf("rc from MQTT subscribe is %d\n", rc); + logMessage("rc from MQTT subscribe is %d\r\n", rc); MQTT::Message message; // QoS 0 char buf[100]; - sprintf(buf, "Hello World! QoS 0 message from app version %f\n", version); + sprintf(buf, "Hello World! QoS 0 message from app version %f\r\n", version); message.qos = MQTT::QOS0; message.retained = false; message.dup = false; @@ -104,32 +108,32 @@ rc = client.publish(topic, message); while (arrivedcount < 1) client.yield(100); - + // QoS 1 - sprintf(buf, "Hello World! QoS 1 message from app version %f\n", version); + sprintf(buf, "Hello World! QoS 1 message from app version %f\r\n", version); message.qos = MQTT::QOS1; message.payloadlen = strlen(buf)+1; rc = client.publish(topic, message); while (arrivedcount < 2) client.yield(100); - + // QoS 2 - sprintf(buf, "Hello World! QoS 2 message from app version %f\n", version); + sprintf(buf, "Hello World! QoS 2 message from app version %f\r\n", version); message.qos = MQTT::QOS2; message.payloadlen = strlen(buf)+1; rc = client.publish(topic, message); while (arrivedcount < 3) client.yield(100); - + if ((rc = client.unsubscribe(topic)) != 0) - printf("rc from unsubscribe was %d\n", rc); - + logMessage("rc from unsubscribe was %d\r\n", rc); + if ((rc = client.disconnect()) != 0) - printf("rc from disconnect was %d\n", rc); - - ipstack.disconnect(); - - printf("Version %.2f: finish %d msgs\n", version, arrivedcount); - + logMessage("rc from disconnect was %d\r\n", rc); + + mqttNetwork.disconnect(); + + logMessage("Version %.2f: finish %d msgs\r\n", version, arrivedcount); + return 0; }