The REST commands and sintaxe of Thinger.io

[alvarolb]

Reading the sensor temperature should be easy, did you tried to use the example given in this post?

ESP8266 analog read

Types of analog sensors: Analog sensors are components that vary their resistivity depending on a real variable, meaning the sensor pin voltage will flow between 0V and Vcc when it is exposed to higher or lower temperatures, light, humidity, etc. This analogic signal will be converted by the microcontroller in a numeric value and stored in a register. Some analog sensors are the LDR (vary according to the luminosity they receive), the thermistor ky-013, and some water or humidity level sensor. …

You should take attention to this piece of code and modify it accordingly to read the temperature of the LM35 and setting the result to the out value.

thing["LDR"] >> [](pson & out){
    out = (unsigned int) analogRead(A0);
};

Hope it helps! Also you can post your code and I can help you to modify it to read the sensor value.