Please capture from the Arduino side the result of the 192.168.1.110/temp request
This will need to be parsed on the Arduino side in Arduino C coding
Once you have isolated the temperature value
if float value use Text Component - t0.setText(&temp); where &temp is already converted to ascii
If integer value use Number Component n0.setValue(&temp); where temp is type uint32_t
But first you will need some C coding to isolate your temperature value.
The scope of Arduino C routines is not in the scope of Nextion.
You may need to seek assistance in coding for Arduino