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sudo systemctl restart networking
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wget https://github.com/eclipse/kura/releases/download/v4.3.0/kura_4.3.0_raspberry-pi-2-3.img.gz
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sudo dd bs=4M if=kura_4.3.0_raspberry-pi-2-3.img of=/dev/sdX conv=fsync
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git clone https://github.com/eclipse/paho.mqtt.c.git
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cd paho.mqtt.c make sudo make install
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#include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <MQTTClient.h> #define ADDRESS "tcp://[MQTTЧÀÍÆ÷IPµØµã]:[MQTTЧÀÍÆ÷¶Ë¿ÚºÅ]" #define CLIENTID "ExampleClientPub" #define TOPIC "test" #define PAYLOAD "Hello, MQTT!" int main(int argc, char* argv[]) { MQTTClient client; MQTTClient_connectOptions conn_opts = MQTTClient_connectOptions_initializer; int rc; MQTTClient_create(&client, ADDRESS, CLIENTID, MQTTCLIENT_PERSISTENCE_DEFAULT, NULL); conn_opts.keepAliveInterval = 20; conn_opts.cleansession = 1; MQTTClient_connect(client, &conn_opts); MQTTClient_message pubmsg = MQTTClient_message_initializer; MQTTClient_deliveryToken token; pubmsg.payload = PAYLOAD; pubmsg.payloadlen = strlen(PAYLOAD); pubmsg.qos = 0; pubmsg.retained = 0; MQTTClient_publishMessage(client, TOPIC, &pubmsg, &token); sleep(1); MQTTClient_disconnect(client, 10000); MQTTClient_destroy(&client); return rc; }
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gcc -o mqtt_client mqtt_client.c -lpaho-mqtt3c ./mqtt_client
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