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Dependencies:   EthernetInterface MQTT mbed-rtos mbed

Fork of HelloMQTT by MQTT

main.cpp@17:719bb7709c80, 2015-03-16 (annotated)

Committer:
stefan1691
Date:
Mon Mar 16 10:26:15 2015 +0000
Revision:
17:719bb7709c80
Parent:
16:28d062c5522b
Child:
18:53d83febbe0a
MQTT Publish von Sensordaten als JSON

Who changed what in which revision?

UserRevisionLine numberNew contents of line
stefan1691 17:719bb7709c80 1 /** MQTT Publish von Sensordaten als JSON */
stefan1691 17:719bb7709c80 2 #include "mbed.h"
icraggs 8:a3e3113054a1 3 #include "MQTTEthernet.h"
icraggs 2:638c854c0695 4 #include "MQTTClient.h"
icraggs 2:638c854c0695 5
stefan1691 17:719bb7709c80 6 // Topic
stefan1691 17:719bb7709c80 7 char* topic = "mbed/k64f/iotkit";
stefan1691 17:719bb7709c80 8 // MQTT Brocker
stefan1691 17:719bb7709c80 9 char* hostname = "iot.eclipse.org";
stefan1691 17:719bb7709c80 10 int port = 1883;
stefan1691 17:719bb7709c80 11 // MQTT Message
stefan1691 17:719bb7709c80 12 MQTT::Message message;
stefan1691 17:719bb7709c80 13 // I/O Buffer
stefan1691 17:719bb7709c80 14 char buf[100];
stefan1691 17:719bb7709c80 15 // UI
stefan1691 17:719bb7709c80 16 DigitalOut led1( LED1 );
stefan1691 17:719bb7709c80 17 // Lichtsensor
stefan1691 17:719bb7709c80 18 AnalogIn light( A1 );
icraggs 2:638c854c0695 19
stefan1691 17:719bb7709c80 20 /** Hilfsfunktion zum Publizieren auf MQTT Broker */
stefan1691 17:719bb7709c80 21 void publish( MQTTEthernet &ipstack, MQTT::Client<MQTTEthernet, Countdown> &client )
stefan1691 17:719bb7709c80 22 {
stefan1691 17:719bb7709c80 23 printf("Connecting to %s:%d\n", hostname, port);
icraggs 6:e4c690c45021 24 int rc = ipstack.connect(hostname, port);
stefan1691 17:719bb7709c80 25 if ( rc != 0 )
stefan1691 17:719bb7709c80 26 printf("rc from TCP connect is %d\n", rc);
stefan1691 17:719bb7709c80 27
stefan1691 17:719bb7709c80 28 // mit MQTT Broker verbinden
stefan1691 17:719bb7709c80 29 MQTTPacket_connectData data = MQTTPacket_connectData_initializer;
icraggs 6:e4c690c45021 30 data.MQTTVersion = 3;
icraggs 8:a3e3113054a1 31 data.clientID.cstring = "mbed-sample";
icraggs 12:086a9314e8a5 32 data.username.cstring = "testuser";
icraggs 12:086a9314e8a5 33 data.password.cstring = "testpassword";
stefan1691 17:719bb7709c80 34 if ( (rc = client.connect(data)) != 0 )
stefan1691 17:719bb7709c80 35 printf("rc from MQTT connect is %d\n", rc);
icraggs 2:638c854c0695 36
stefan1691 17:719bb7709c80 37 // Message als JSON aufbereiten und senden
stefan1691 17:719bb7709c80 38 sprintf( buf, "{ \"light:\": %f }", light.read() );
stefan1691 17:719bb7709c80 39 printf( "Publish: %s\n", buf );
icraggs 2:638c854c0695 40 message.qos = MQTT::QOS0;
icraggs 2:638c854c0695 41 message.retained = false;
icraggs 2:638c854c0695 42 message.dup = false;
stefan1691 17:719bb7709c80 43 message.payload = (void*) buf;
icraggs 2:638c854c0695 44 message.payloadlen = strlen(buf)+1;
stefan1691 17:719bb7709c80 45 client.publish(topic, message);
icraggs 2:638c854c0695 46
stefan1691 17:719bb7709c80 47 // Verbindung beenden, ansonsten ist nach 4x Schluss
stefan1691 17:719bb7709c80 48 client.disconnect();
icraggs 2:638c854c0695 49 ipstack.disconnect();
icraggs 0:0cae29831d01 50 }
stefan1691 17:719bb7709c80 51
stefan1691 17:719bb7709c80 52 /** Hauptprogramm */
stefan1691 17:719bb7709c80 53 int main()
stefan1691 17:719bb7709c80 54 {
stefan1691 17:719bb7709c80 55 // Ethernet und MQTT initialisieren (muss in main erfolgen)
stefan1691 17:719bb7709c80 56 MQTTEthernet ipstack = MQTTEthernet();
stefan1691 17:719bb7709c80 57 MQTT::Client<MQTTEthernet, Countdown> client = MQTT::Client<MQTTEthernet, Countdown>(ipstack);
stefan1691 17:719bb7709c80 58
stefan1691 17:719bb7709c80 59 while ( 1 )
stefan1691 17:719bb7709c80 60 {
stefan1691 17:719bb7709c80 61 led1 = 1;
stefan1691 17:719bb7709c80 62 publish( ipstack, client );
stefan1691 17:719bb7709c80 63 led1 = 0;
stefan1691 17:719bb7709c80 64 wait ( 2.0 );
stefan1691 17:719bb7709c80 65 }
stefan1691 17:719bb7709c80 66 }