How to measure temperature on esp8266?

Question

Arduino

Good evening.
Tell me with code in c ++ how to measure the voltage and temperature on the esp8266 chip itself?

Answer 1

I won’t tell you about the temperature, but nodemcu_api has this:
Description
Reads the voltage value on the vdd33 pin
Example

v = node.readvdd33() / 1000
print(v)
v=nil

Answer 2

And where did you get that it has a built-in thermal sensor?