ReiMerc/temperature-alarm
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Send JSON string to MQTT

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This commit is contained in:
Reimar 2025-03-24 10:40:23 +01:00
parent 10d36e7ccc
commit 80df2dfc52
Signed by: Reimar
GPG Key ID: 93549FA07F0AE268
1 changed files with 9 additions and 2 deletions
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11
iot/main.c
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@ -22,9 +22,16 @@ void *watch_temperature(void *arg)
while (true) {
double temperature = get_temperature(temp_handle);
size_t timestamp = time(NULL);
char *str = malloc(snprintf(NULL, 0, "%lf", temperature) + 1);
sprintf(str, "%lf", temperature);
char *format = "{"
"\"temperature\": %lf,"
"\"device_id\": \"%s\","
"\"timestamp\": %zu"
"}";
char *str = malloc(snprintf(NULL, 0, format, temperature, device_id, timestamp) + 1);
sprintf(str, format, temperature, device_id, timestamp);
mqtt_send_message("temperature", str);