Are you familiar with MAC Addresses? Basically a MAC address is a unique identifier assigned to your ESP32 (or any network device). You can use this function to retrieve your ESP32 MAC address while using a WiFi or web server example:

String mac = WiFi.macAddress();
Serial.println(mac);

Then, you login into your router dashboard (the router ip and login/pass are usually printed in the router label). You can assign a fixed IP address to your ESP MAC address, so it always has the same IP address.
The steps to assign a fixed IP to a MAC address is very similar to all the routers.

Thanks Rui, problem solved. I didn’t have a clue that I could assign a fixed IP address to my ESP Mac address.
Your ESP32 course has been well worth the $29.

You’re welcome! I’m glad you made it work and I’m happy that you found the course useful.
I plan to add more content to the course (like assigning fixed IP address and much more, but right now I’m working on adding the ESP32 Projects Modules).

I’m actually having that same problem (I’m a little surprised it hasn’t happened before).  I’m wondering what you think about modifying the dhcpcd.conf file of my server to specify a static address? Is that generally considered safe? Or something to avoid?  I don’t have easy access to the router configuration.
Thanks!  And the two courses I’ve purchased have both been worth the money!

To be honest I’ve never had the need to modify the dhcpcd.conf file, but if you make the right changes it should work. However, I would leave that option as a last resource.
You could also try to assign the IP directly with WiFi.config() function: https://www.arduino.cc/en/Reference/WiFiConfig
Note that I’m not sure if WiFi.config() works well with the ESP32, because I’ve found a bunch of people having problems when I search for “ESP32 static IP address arduino”…
But the best method to assign the IP address to an ESP32 or a device is using the router configurations pointing to a MAC Address..
I’m glad you found the courses helpful! Thanks for your feedback!

Assigning an IP address to the ESP MAC address was a great help.

I’m glad it helped!

I can confirm that the esp32  WiFi.config(ip)  does not work as described in the Arduino documents.  No matter how ip is declared a the compiler throws a type error.

You need to specify at least 3 parameters: local_IP, gateway & subnet.  primaryDNS and seconday DNS are optional such as:

IPAddress local_IP(192, 168, 0, 201);
IPAddress gateway(192, 168, 0, 1);
IPAddress subnet(255, 255, 255, 0);
IPAddress primaryDNS(8, 8, 8, 8); //optional
IPAddress secondaryDNS(8, 8, 4, 4); //optional

WiFi.config(local_IP, gateway, subnet);

The example “WiFiClientStaticIP” in the esp32 examples works.

Thanks for letting me know Andy! In two or three weeks, I’ll be publishing an article in the RNT blog on how to assign a fix IP address to the ESP32.