ESP32 static IP not saved after restarting the device

[krupis]

Hello. I am learning about esp32 and trying your library. I am using the example program: Async_ESP32_FSWebServer_DRD

I have not modified the code yet. When I run the program. A new network appeared

I am able to connect to my device by typing the ip address : 192.168.1.100 and change some configurataion:

Now I can see that the device connects with the new parameters: (I have set a new static ip 192.168.4.210)

However, the thing that I do not fully understand, when i restart my esp32 device, it goes changes my static ip (192.168.4.210) to: 192.168.2.232

Is that normal? Should it not save my configuration even after I restart the device?

Also, I am unsure about: Open http://async-esp32fs.local/edit to see the file browser Using username = admin and password = admin

Opening this webpage in a browswer fails everytime. How do i use it?

Appreciate any sort of advice. Thanks in advance.

[khoih-prog]

Hi @krupis

Thanks for using the library.

Is that normal? Should it not save my configuration even after I restart the device?

Currently, the example still is not perfect, with the bug as you experienced (Static IP input in CP is not persistent). You can hard-code staticIP in the sketch as follows:

#ifdef ESP32
    IPAddress stationIP   = IPAddress(192, 168, 4, 210);     // Change this to persistent Static IP
  #else
    IPAddress stationIP   = IPAddress(192, 168, 4, 186);
  #endif

Opening this webpage in a browswer fails everytime. How do i use it?

If the ESP32 MDNS is somehow not working perfectly (depending on your network, OS, etc.), and you can use IP address directly to access the Server, for example: http://192.168.4.210/edit instead of http://async-esp32fs.local/edit.

[krupis]

Thanks for your quick response. I really need to be able to change the ip through the server because once device is programmed it will not be touched again so perhaps il have to dig deeper see if I can troubleshoot. Also, is it possible to change from the static IP mode to dhcp mode?

On Thu, 12 Nov 2020, 18:39 Khoi Hoang, notifications@github.com wrote:

Hi @krupis https://github.com/krupis

Thanks for using the library.

Is that normal? Should it not save my configuration even after I restart the device?

Currently, the example still is not perfect, with the bug as you experienced (Static IP input in CP is not persistent). You can hard-code staticIP in the sketch as follows:

ifdef ESP32

IPAddress stationIP   = IPAddress(192, 168, 4, 210);     // Change this to persistent Static IP

else

IPAddress stationIP   = IPAddress(192, 168, 4, 186);

endif

Opening this webpage in a browswer fails everytime. How do i use it?

If the ESP32 MDNS is somehow not working perfectly (depending on your network, OS, etc.), and you can use IP address directly to access the Server, for example: http://192.168.4.210/edit instead of http://async-esp32fs.local/edit .

— You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub https://github.com/khoih-prog/ESPAsync_WiFiManager/issues/19#issuecomment-726193365, or unsubscribe https://github.com/notifications/unsubscribe-auth/AFJU62RL4ECBY76CLQKSZ6LSPQFVRANCNFSM4TTI5HSQ .

[khoih-prog]

I really advise you against the use of staticIP unless you have good reason to do so. StaticIP will create lots of problem if being used not correctly, especially for normal users, and users certainly have to know more about the network to set it correctly, without errors and conflicts.

It's better for you to use DHCP now, by modifying the code as follows:

// Use USE_DHCP_IP == true for dynamic DHCP IP, false to use static IP which you have to change accordingly to your network
#if (defined(USE_STATIC_IP_CONFIG_IN_CP) && !USE_STATIC_IP_CONFIG_IN_CP)
// Force DHCP to be true
  #if defined(USE_DHCP_IP)
    #undef USE_DHCP_IP
  #endif
  #define USE_DHCP_IP     true
#else
  // You can select DHCP or Static IP here
  #define USE_DHCP_IP     true                      // Always using DHCP  <=====================
  //#define USE_DHCP_IP     false
#endif

The CP is now as simple as this and much better for users

and you can see MDNS will work correctly with DHCP

[krupis]

That is true but the project I am doing must have an optiom to do so. I may not need it most of the time but I still need to be able to switch to static mode if required. For example each esp will be given an IP on a seperate network just for monitoring temperatures. I may need to know every device IP address and be sure that it will not change since I will ise modbus tcp to transfee data

On Thu, 12 Nov 2020, 20:02 Khoi Hoang, notifications@github.com wrote:

I really advise you against the use of staticIP unless you have good reason to do so. StaticIP will create lots of problem if being used not correctly, especially for normal users, and users certainly have to know more about the network to set it correctly, without errors and conflicts.

It's better for you to use DHCP now, by modifying the code as follows:

// Use USE_DHCP_IP == true for dynamic DHCP IP, false to use static IP which you have to change accordingly to your network

if (defined(USE_STATIC_IP_CONFIG_IN_CP) && !USE_STATIC_IP_CONFIG_IN_CP)

// Force DHCP to be true

if defined(USE_DHCP_IP)

#undef USE_DHCP_IP

endif

define USE_DHCP_IP true

else

// You can select DHCP or Static IP here

define USE_DHCP_IP true // Always using DHCP <=====================

//#define USE_DHCP_IP false

endif

The CP is now as simple as this and much better for users

[image: image] https://user-images.githubusercontent.com/57012152/98977614-ca4c2d00-24e6-11eb-94d3-866359079495.png

and you can see MDNS will work correctly with DHCP

[image: image] https://user-images.githubusercontent.com/57012152/98977978-3cbd0d00-24e7-11eb-9ce9-72a29d9c60c1.png

[image: image] https://user-images.githubusercontent.com/57012152/98977940-3333a500-24e7-11eb-9ac4-89ae46602a58.png

— You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub https://github.com/khoih-prog/ESPAsync_WiFiManager/issues/19#issuecomment-726242919, or unsubscribe https://github.com/notifications/unsubscribe-auth/AFJU62VJBZIRC5DS6HEDGADSPQPMBANCNFSM4TTI5HSQ .

[khoih-prog]

If you use DHCP, you can easily assign every device a unique MDNS name so that MODBUS TCP can reach to xfer data.

If staticIP is selected, that fastest way to do now for you, before the feature is fixed, is to use dynamic parameter (ESPAsync_WMParameter) to input from CP/ store staticIP, then replacing staticIP, from Line 486 with the dynamic param (staticIP) got from CP.

#if !USE_DHCP_IP
  #if USE_CONFIGURABLE_DNS
    // Set static IP, Gateway, Subnetmask, DNS1 and DNS2.
    ESPAsync_wifiManager.setSTAStaticIPConfig(stationIP, gatewayIP, netMask, dns1IP, dns2IP);
  #else
    // Set static IP, Gateway, Subnetmask, Use auto DNS1 and DNS2.
    ESPAsync_wifiManager.setSTAStaticIPConfig(stationIP, gatewayIP, netMask);
  #endif
#endif

Have a look at other examples about how to use dynamic parameters ESPAsync_WMParameter.

You have to understand that these are just examples to demonstrate the basic operation of the library, and there is no one-size-fit-all solution for every use case.

If you can find a quick solution, please post here to help other library's users.

[khoih-prog]

This has been fixed in ESPAsync_WiFiManager v1.4.0

---

Major Releases v1.4.0

1. Fix staticIP not saved in examples. See ESP32 static IP not saved after restarting the device
2. Add structures and functions to handle AP and STA IPs.
3. Add complex examples
   • Async_ConfigOnDRD_FS_MQTT_Ptr_Complex to demo usage of std::map
   • Async_ConfigOnDRD_FS_MQTT_Ptr_Medium.
4. Add simple minimal examples
   • Async_ConfigOnDRD_ESP32_minimal
   • Async_ConfigOnDRD_ESP8266_minimal
   • Async_AutoConnect_ESP32_minimal
   • Async_AutoConnect_ESP8266_minimal
5. Modify Version String
6. Add Table of Contents

---

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