50 lines
1.2 KiB
C++
50 lines
1.2 KiB
C++
#include <cstdio>
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#include <cstring>
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#include "temperature_conversion.h"
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#include <mosquittopp.h>
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mqtt_tempconv::mqtt_tempconv(const char *id, const char *host, int port) : mosquittopp(id)
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{
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int keepalive = 60;
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/* Connect immediately. This could also be done by calling
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* mqtt_tempconv->connect(). */
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connect(host, port, keepalive);
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};
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mqtt_tempconv::~mqtt_tempconv()
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{
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}
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void mqtt_tempconv::on_connect(int rc)
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{
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printf("Connected with code %d.\n", rc);
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if(rc == 0){
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/* Only attempt to subscribe on a successful connect. */
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subscribe(NULL, "temperature/celsius");
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}
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}
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void mqtt_tempconv::on_message(const struct mosquitto_message *message)
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{
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double temp_celsius, temp_farenheit;
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char buf[51];
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if(!strcmp(message->topic, "temperature/celsius")){
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memset(buf, 0, 51*sizeof(char));
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/* Copy N-1 bytes to ensure always 0 terminated. */
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memcpy(buf, message->payload, 50*sizeof(char));
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temp_celsius = atof(buf);
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temp_farenheit = temp_celsius*9.0/5.0 + 32.0;
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snprintf(buf, 50, "%f", temp_farenheit);
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publish(NULL, "temperature/farenheit", strlen(buf), buf);
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}
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}
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void mqtt_tempconv::on_subscribe(int mid, int qos_count, const int *granted_qos)
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{
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printf("Subscription succeeded.\n");
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}
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