I am able to get the IP in a Windows based FreeRTOS simulator, But that is only with a wired interface or Ethernet connection
While I am not able to get an IP with a WIFI connection
Any modification is required? Please let me know
Modifications of what ?
You should give an amount of details (HW/SW platform, OS version, good explanation of the problem up to steps to reproduce, if possible), that someone is at least able to get an idea of the problem and maybe give an answer.
Imagine someone asks you a question like this. What would you answer 
Simulator means its software. I am using windows based FreeRTOS simulator
The full name is below:
FreeRTOS_Plus_TCP_Minimal_Windows_Simulator