paclema / esp32_lwip_nat_example Goto Github PK

Linking .pio\build\mhetesp32minikit\firmware.elf
c:/users/vell0/.platformio/packages/[email protected]+2021r2-patch3/bin/../lib/gcc/xtensa-esp32-elf/8.4.0/../../../../xtensa-esp32-elf/bin/ld.exe: C:\Users\vell0.platformio\packages\framework-arduinoespressif32\tools\sdk\esp32\lib\liblwip.a(utils.c.obj):(.literal.ppp_vslprintf+0x10): undefined reference to __locale_ctype_ptr' c:/users/vell0/.platformio/packages/[email protected]+2021r2-patch3/bin/../lib/gcc/xtensa-esp32-elf/8.4.0/../../../../xtensa-esp32-elf/bin/ld.exe: C:\Users\vell0\.platformio\packages\framework-arduinoespressif32\tools\sdk\esp32\lib\liblwip.a(utils.c.obj): in function ppp_vslprintf':
/home/pi/tmp/esp32-arduino-lib-builder/build/../esp-idf/components/lwip/lwip/src/netif/ppp/utils.c:181: undefined reference to __locale_ctype_ptr' c:/users/vell0/.platformio/packages/[email protected]+2021r2-patch3/bin/../lib/gcc/xtensa-esp32-elf/8.4.0/../../../../xtensa-esp32-elf/bin/ld.exe: /home/pi/tmp/esp32-arduino-lib-builder/build/../esp-idf/components/lwip/lwip/src/netif/ppp/utils.c:193: undefined reference to __locale_ctype_ptr'
collect2.exe: error: ld returned 1 exit status
*** [.pio\build\mhetesp32minikit\firmware.elf] Error 1
========================= [FAILED] Took 11.90 seconds =========================

Hi @paclema,

finally my esp was successfully activated as a wifi extender using the arduino framework, the maximum test results were 2Mbps.
my question is how to make it full speed as per specs around 15Mbps?
what parameters should be changed in order to make it fullspeed. Thank you very much.

Hi @paclema, I'm trying to follow your steps to have this working on platformio. I have built the libraries with NAT enabled, and now I have to use this libraries in Platformio. This is where I get lost because I haven't used PlatformIO before. You say that there is a folder /packages in C:/user.../.platformio, but I don't have this folder, do you know if there is something to do first to get this configured?

https://github.com/paclema/esp32_lwip_nat_example/blob/main/src/main.cpp

what i need to do to declare?

Hi, after failing few times by manually recompile Arduino-SDK with enabled LWIP-NAT, I have asked ChatGPT.

It told me to use this platformio.ini:

[env:esp32dev]
platform = espressif32
board = esp32dev
framework = arduino
monitor_speed = 115200
lib_deps = 
    esp32wifi
build_flags = 
    -DLWIP_FEATURES=1
    -DLWIP_IPV4_NAT=1

ChatGPTs C++ code was bullshit, but replacing it with your example file: IT WORKS!
Using these build flags, your example script works out of the box. I don't really understand, why it works without issues by using standard arduino sdk.

Do you know why?

After using the libs you uploaded, I found that esp32 cannot wake up through the touchpad or RTCIO after deep sleep.

The DNS offer code and some other parts don't work with recent versions of the Espressif ESP32 framework: ver 3.0.0+ for Arduino IDE or ESP-IDF ver 5.1+. This is due to deprecated/removed features.

Here are suggested fixes using Arduino IDE:

1. Replace existing code to "Give DNS servers to AP side" (lines 130-156), since code with tcpip_adapter_* appears to have been deprecated / removed from ESP-IDF. Can use the following:

    // This function is not in any header file, taken from code associated with WiFi.h (AP.cpp)
    esp_netif_t* get_esp_interface_netif(esp_interface_t interface);
    esp_netif_t* esp_netif_ap = get_esp_interface_netif(ESP_IF_WIFI_AP);   // Get the esp_netif reference for AP
    Serial.printf("AP esp_netif is %p\n", esp_netif_ap);
    if (esp_netif_ap != nullptr) {
        // Note this assumes IPv4
        ip_addr_t dnsip = {};
        WiFi.dnsIP(0).to_ip_addr_t(&dnsip);  // Get the main DNS server address from STA
        u32_t addr = dnsip.u_addr.ip4.addr;  // Convert to unsigned int, already in network byte order
        if (addr == 0) {
            addr = htonl(0x08080808);       // Use Google as fallback
        }
        Serial.printf("Giving DNS IP %s to AP\n", IPAddress(addr).toString().c_str());

        esp_netif_dns_info_t dns = {};
        dns.ip.u_addr.ip4.addr = addr;
        dns.ip.type = IPADDR_TYPE_V4;
        dhcps_offer_t dhcps_dns_value = OFFER_DNS;
        ESP_ERROR_CHECK(esp_netif_dhcps_stop(esp_netif_ap));
        ESP_ERROR_CHECK(esp_netif_dhcps_option(esp_netif_ap, ESP_NETIF_OP_SET, ESP_NETIF_DOMAIN_NAME_SERVER, &dhcps_dns_value, sizeof(dhcps_dns_value)));
        ESP_ERROR_CHECK(esp_netif_set_dns_info(esp_netif_ap, ESP_NETIF_DNS_MAIN, &dns));  // Only one DNS supported, not BACKUP or FALLBACK
        ESP_ERROR_CHECK(esp_netif_dhcps_start(esp_netif_ap));
    }

2. Remove all code in loop() function, it is non-critical. Replace with delay(1000);

3. Note to fully migrate the code away from deprecated APIs to the new Espressif APIs you will need to use 'esp_netif' style calls as in this example: https://github.com/espressif/esp-idf/tree/master/examples/wifi/softap_sta

In my testing the code here is significantly faster than using the new APIs for everything, ~10 Mbps down vs. 6 Mbps. Not sure why. All this took me several days to figure out!