ESP8266 Community Forum

- Thu Feb 26, 2015 4:20 am #10767 Can MQTT_CLIENT_ID be empty? I suppose not.

- Mon Mar 02, 2015 10:58 am #11102 Can someone please help with this code?

Code: Select allstruct dht_sensor_data* r = DHTRead();
   float lastTemp = r->temperature;
   float lastHum = r->humidity;

   char _Temp[8];
   ets_sprintf(_Temp, "%f", lastTemp);

   //char _Humi[10];
   //ets_sprintf(_Humi, "%f", lastHum);

   if(r->success)
   {
      MQTT_Publish(&mqttClient, "sensor/temp", (const char*)_Temp, 14, 2, 0); //publishes %fX:
      //MQTT_Publish(&mqttClient, "sensor/humi", (const char*)_Humi, 14, 2, 0);
      console_printf("Temperature: %d.%d *C, Humidity: %d.%d %%\r\n", (int)(lastTemp),(int)((lastTemp - (int)lastTemp)*100), (int)(lastHum),(int)((lastHum - (int)lastHum)*100));
   }

It publishes %fX:
However terminal gives correct Temperature: 20.0 *C, Humidity: 41.79 %

- Mon Mar 02, 2015 1:05 pm #11108

It publishes %fX:
However terminal gives correct Temperature: 20.0 *C, Humidity: 41.79 %

The ets_sprintf() function (of the sdk) does not support float "%f".
You will have to build the _Temp string in the same way as you do in console_printf()

- Mon Mar 02, 2015 4:22 pm #11123

The ets_sprintf() function (of the sdk) does not support float "%f".
You will have to build the _Temp string in the same way as you do in console_printf()

Thanks got it working!
This is my working code snipped in case it can help someone:

Code: Select all   struct dht_sensor_data* r = DHTRead();
   float lastTemp = r->temperature;
   float lastHum = r->humidity;

   console_printf("Get size of temp data\r\n");
   int tempSize = sizeof("%d.%d", (int)(lastTemp),(int)((lastTemp - (int)lastTemp)*100));
   console_printf("Data size is %d \r\n",tempSize);
   char _Temp[tempSize];
   console_printf("Make string of it\r\n");
   ets_sprintf(_Temp, "%d.%d", (int)(lastTemp),(int)((lastTemp - (int)lastTemp)*100));

   console_printf("Get size of humi data\r\n");
   int humiSize = sizeof("%d.%d", (int)(lastHum),(int)((lastHum - (int)lastHum)*100));
   console_printf("Data size is %d \r\n",humiSize);
   char _Humi[humiSize];
   console_printf("Make string of it\r\n");
   ets_sprintf(_Humi, "%d.%d", (int)(lastHum),(int)((lastHum - (int)lastHum)*100));


   console_printf("String created\r\n");
   if(r->success)
   {
      MQTT_Publish(&mqttClient, "sensors/test/temp", (const char*)_Temp, tempSize, 0, 0); //%fX:
      MQTT_Publish(&mqttClient, "sensors/test/humi", (const char*)_Humi, humiSize, 2, 0);
      console_printf("Temperature: %d.%d *C, Humidity: %d.%d %%\r\n", (int)(lastTemp),(int)((lastTemp - (int)lastTemp)*100), (int)(lastHum),(int)((lastHum - (int)lastHum)*100));
   }