ESP32C6 + esp_http_client link error

[jose3ww]

The compilation of the code below result in link error with "mbedtls" things.

• using Platform IO on MacOS.
• WifiProvisioner related doesn't matter. Just to make it complete (but not tested).
• HTTPClient is not an option because I'd like to use chunk send to save RAM usage.

#include <Arduino.h>
#include <list>
#include <WiFi.h>
#include <WiFiProvisioner.h>
#include <esp_http_client.h>

static const char* WEB_SERVER = "http://test.com/upload";
static const char* PASSCODE = "";
static const size_t CHUNK_SIZE = 256;

bool post_chunked(const char* ptr, size_t len)
{
    esp_http_client_config_t config = {
        .url = WEB_SERVER,
    };
    esp_http_client_handle_t client = esp_http_client_init(&config);

    // Transfer-Encoding: chunked
    esp_err_t err = esp_http_client_open(client, -1);
    Serial.println("HTTP: Open connection");
    if (err != ESP_OK) {
        Serial.print("HTTP: Failed to open connection");
        Serial.println(esp_err_to_name(err));
        return false;
    }

    size_t sent_len = 0;
    while(sent_len < len)
    {
        size_t chunk_len = len - sent_len;
        if (chunk_len > CHUNK_SIZE) {
            chunk_len = CHUNK_SIZE;
        }
        Serial.println("HTTP: Sending a chunk");
        int written = esp_http_client_write(client, ptr + sent_len, chunk_len);
        if (written < 0) {
            Serial.println("HTTP: Failed to write a chunk");
            break;
        }
        sent_len += written;
    }

    Serial.println("HTTP: Sending chunks complete");

    // get the HTTP response status code
    int status = esp_http_client_fetch_headers(client);
    Serial.print("HTTP: POST Status = ");
    Serial.println(esp_http_client_get_status_code(client));

    esp_http_client_close(client);
    esp_http_client_cleanup(client);
    return status == 200; // 200 OK
}

void setup() {
  WiFi.mode(WIFI_STA);
  WiFi.begin();

  int retryCount = 0;
  const int maxRetries = 10;
  while (WiFi.status() != WL_CONNECTED && retryCount < maxRetries)
  {
    Serial.print(".");
    delay(1000);
    retryCount++;
  }

  if (WiFi.status() == WL_CONNECTED)
  {
    Serial.println("\nConnected to WiFi!");
    Serial.println(WiFi.localIP());
  }
  else
  {
    Serial.println("\nWiFi connect failed. Start provisioning.");
    WiFiProvisioner provisioner;
    provisioner.getConfig().SHOW_INPUT_FIELD = false;
    provisioner.getConfig().SHOW_RESET_FIELD = false;

    // Set the success callback
    provisioner.onSuccess(
        [](const char *ssid, const char *password, const char *input)
        {
          Serial.printf("Provisioning successful! Connected to SSID: %s\n", ssid);
          if (password)
          {
            Serial.printf("Password: %s\n", password);
          }
        });

    // Start provisioning
    Serial.println("Starting WiFi provisioning...");
    provisioner.startProvisioning();
  }

  uint8_t data[1000];
  for(size_t i = 0; i < 1000; i++)
    data[i] = i;
  post_chunked((char*)&data, 1000);
}

void loop() {
  // put your main code here, to run repeatedly:
}

Here's a part of the compilation output.

Linking .pio/build/seeed_xiao_esp32_c6/firmware.elf
/Users/myname/.platformio/packages/toolchain-riscv32-esp@13.2.0+20240530/bin/../lib/gcc/riscv32-esp-elf/13.2.0/../../../../riscv32-esp-elf/bin/ld: /Users/myname/.platformio/packages/framework-arduinoespressif32/tools/esp32-arduino-libs/esp32c6/lib/libesp-tls.a(esp_tls_mbedtls.c.obj): in function `.L0 ':
(.text.esp_mbedtls_read+0xa): undefined reference to `mbedtls_ssl_read'
/Users/myname/.platformio/packages/toolchain-riscv32-esp@13.2.0+20240530/bin/../lib/gcc/riscv32-esp-elf/13.2.0/../../../../riscv32-esp-elf/bin/ld: (.text.esp_mbedtls_write+0x22): undefined reference to `mbedtls_ssl_write'
/Users/myname/.platformio/packages/toolchain-riscv32-esp@13.2.0+20240530/bin/../lib/gcc/riscv32-esp-elf/13.2.0/../../../../riscv32-esp-elf/bin/ld: (.text.set_ca_cert+0x50): undefined reference to `mbedtls_ssl_conf_authmode'
/Users/myname/.platformio/packages/toolchain-riscv32-esp@13.2.0+20240530/bin/../lib/gcc/riscv32-esp-elf/13.2.0/../../../../riscv32-esp-elf/bin/ld: /Users/myname/.platformio/packages/framework-arduinoespressif32/tools/esp32-arduino-libs/esp32c6/lib/libesp-tls.a(esp_tls_mbedtls.c.obj): in function `.LVL30':
(.text.set_ca_cert+0x60): undefined reference to `mbedtls_ssl_conf_ca_chain'
/Users/myname/.platformio/packages/toolchain-riscv32-esp@13.2.0+20240530/bin/../lib/gcc/riscv32-esp-elf/13.2.0/../../../../riscv32-esp-elf/bin/ld: /Users/myname/.platformio/packages/framework-arduinoespressif32/tools/esp32-arduino-libs/esp32c6/lib/libesp-tls.a(esp_tls_mbedtls.c.obj): in function `.LVL48':
(.text.set_pki_context+0x98): undefined reference to `mbedtls_ssl_conf_own_cert'
/Users/myname/.platformio/packages/toolchain-riscv32-esp@13.2.0+20240530/bin/../lib/gcc/riscv32-esp-elf/13.2.0/../../../../riscv32-esp-elf/bin/ld: /Users/myname/.platformio/packages/framework-arduinoespressif32/tools/esp32-arduino-libs/esp32c6/lib/libesp-tls.a(esp_tls_mbedtls.c.obj): in function `.L0 ':
(.text.esp_mbedtls_verify_certificate+0xa): undefined reference to `mbedtls_ssl_get_verify_result'
/Users/myname/.platformio/packages/toolchain-riscv32-esp@13.2.0+20240530/bin/../lib/gcc/riscv32-esp-elf/13.2.0/../../../../riscv32-esp-elf/bin/ld: (.text.esp_mbedtls_handshake+0xc): undefined reference to `mbedtls_ssl_handshake'
/Users/myname/.platformio/packages/toolchain-riscv32-esp@13.2.0+20240530/bin/../lib/gcc/riscv32-esp-elf/13.2.0/../../../../riscv32-esp-elf/bin/ld: (.text.esp_mbedtls_get_bytes_avail+0x2): undefined reference to `mbedtls_ssl_get_bytes_avail'
/Users/myname/.platformio/packages/toolchain-riscv32-esp@13.2.0+20240530/bin/../lib/gcc/riscv32-esp-elf/13.2.0/../../../../riscv32-esp-elf/bin/ld: (.text.esp_mbedtls_cleanup+0x48): undefined reference to `mbedtls_ssl_config_free'
/Users/myname/.platformio/packages/toolchain-riscv32-esp@13.2.0+20240530/bin/../lib/gcc/riscv32-esp-elf/13.2.0/../../../../riscv32-esp-elf/bin/ld: (.text.esp_mbedtls_cleanup+0x5a): undefined reference to `mbedtls_ssl_free'
/Users/myname/.platformio/packages/toolchain-riscv32-esp@13.2.0+20240530/bin/../lib/gcc/riscv32-esp-elf/13.2.0/../../../../riscv32-esp-elf/bin/ld: (.text.set_client_config+0x40): undefined reference to `mbedtls_ssl_set_hostname'
/Users/myname/.platformio/packages/toolchain-riscv32-esp@13.2.0+20240530/bin/../lib/gcc/riscv32-esp-elf/13.2.0/../../../../riscv32-esp-elf/bin/ld: (.text.set_client_config+0x86): undefined reference to `mbedtls_ssl_config_defaults'
/Users/myname/.platformio/packages/toolchain-riscv32-esp@13.2.0+20240530/bin/../lib/gcc/riscv32-esp-elf/13.2.0/../../../../riscv32-esp-elf/bin/ld: (.text.set_client_config+0xb6): undefined reference to `mbedtls_ssl_conf_authmode'
/Users/myname/.platformio/packages/toolchain-riscv32-esp@13.2.0+20240530/bin/../lib/gcc/riscv32-esp-elf/13.2.0/../../../../riscv32-esp-elf/bin/ld: (.text.set_client_config+0x112): undefined reference to `mbedtls_ssl_conf_ciphersuites'
/Users/myname/.platformio/packages/toolchain-riscv32-esp@13.2.0+20240530/bin/../lib/gcc/riscv32-esp-elf/13.2.0/../../../../riscv32-esp-elf/bin/ld: (.text.set_client_config+0x136): undefined reference to `mbedtls_ssl_conf_authmode'
/Users/myname/.platformio/packages/toolchain-riscv32-esp@13.2.0+20240530/bin/../lib/gcc/riscv32-esp-elf/13.2.0/../../../../riscv32-esp-elf/bin/ld: /Users/myname/.platformio/packages/framework-arduinoespressif32/tools/esp32-arduino-libs/esp32c6/lib/libesp-tls.a(esp_tls_mbedtls.c.obj): in function `.LVL139':
(.text.set_client_config+0x146): undefined reference to `mbedtls_ssl_conf_ca_chain'
/Users/myname/.platformio/packages/toolchain-riscv32-esp@13.2.0+20240530/bin/../lib/gcc/riscv32-esp-elf/13.2.0/../../../../riscv32-esp-elf/bin/ld: /Users/myname/.platformio/packages/framework-arduinoespressif32/tools/esp32-arduino-libs/esp32c6/lib/libesp-tls.a(esp_tls_mbedtls.c.obj): in function `.L0 ':
(.text.esp_create_mbedtls_handle+0x22): undefined reference to `mbedtls_ssl_init'
/Users/myname/.platformio/packages/toolchain-riscv32-esp@13.2.0+20240530/bin/../lib/gcc/riscv32-esp-elf/13.2.0/../../../../riscv32-esp-elf/bin/ld: (.text.esp_create_mbedtls_handle+0x34): undefined reference to `mbedtls_ssl_config_init'
/Users/myname/.platformio/packages/toolchain-riscv32-esp@13.2.0+20240530/bin/../lib/gcc/riscv32-esp-elf/13.2.0/../../../../riscv32-esp-elf/bin/ld: (.text.esp_create_mbedtls_handle+0x82): undefined reference to `mbedtls_ssl_conf_rng'
/Users/myname/.platformio/packages/toolchain-riscv32-esp@13.2.0+20240530/bin/../lib/gcc/riscv32-esp-elf/13.2.0/../../../../riscv32-esp-elf/bin/ld: (.text.esp_create_mbedtls_handle+0xc0): undefined reference to `mbedtls_ssl_setup'
/Users/myname/.platformio/packages/toolchain-riscv32-esp@13.2.0+20240530/bin/../lib/gcc/riscv32-esp-elf/13.2.0/../../../../riscv32-esp-elf/bin/ld: (.text.esp_create_mbedtls_handle+0x11e): undefined reference to `mbedtls_ssl_set_bio'
collect2: error: ld returned 1 exit status
*** [.pio/build/seeed_xiao_esp32_c6/firmware.elf] Error 1

platform.ini for your reference.

[env:seeed_xiao_esp32_c6]
;;; Seeed XIAO ESP32-C6 board configuration
platform = https://github.com/Seeed-Studio/platform-seeedboards.git
; below results in same result 
; platform = Seeed Studio 
board = seeed-xiao-esp32-c6
framework = arduino
monitor_speed = 115200
lib_deps = 
	santerilindfors/WiFiProvisioner@^2.0.0

I tried https://github.com/pioarduino/platform-espressif32 too. It compiled well, but I2C error occured thus not usable.

[ackPeng]

@jose3ww Hello, I solved this compilation problem by following the steps below:

1. Download: https://github.com/Jason2866/esp32-arduino-lib-builder and compile according to the readme. After the compilation is completed, there will be an esp32-arduino-libs folder in the out/tools directory.
2. Delete framework-arduinoespressif32/tools/esp32-arduino-libs and copy the newly compiled folder over.

[ackPeng]

We will put this package into the toolchain after verifying the function, so that users do not need to compile it themselves

[jose3ww]

@ackPeng Thanks. If so, I just wait for your coming update and then give it a try.
Thanks again.

[ackPeng]

Already updated

[jose3ww]

@ackPeng I did Full Clean, edit(with no change) platform.ini then re-build. The result is the same as before.
Anything I should/can do?

[ackPeng]

@jose3ww Delete the platformio/packages/framework-arduinoespressif32 folder. The system will download it again when recompiling. Using the newly downloaded package should compile normally.

[ackPeng]

The download link of this package is: https://files.seeedstudio.com/arduino/platformio/framework-arduinoespressif32.zip. The original package was more than 90M, and the updated one should be more than 300M. During the test, I found that the system will cache the old version of the package. If the package you automatically download is still 90M, please manually download and decompress it to the target directory.

[ackPeng]

Delete the contents under .platformio/.cache/ to avoid cache problems

[jose3ww]

The test program I posted in this issue compiles well without error by following your direction.

But my real project starts showing error on Link with this new version as follows.
I have no idea why it happens yet, but quick sharing.
It's critical situation for me as my main dev is stopped. Because previously I could avoid the issue by not using esp_http_client, but no workaround anymore...

Linking .pio/build/seeed_xiao_esp32_c6/firmware.elf
/Users/myname/.platformio/packages/toolchain-riscv32-esp@13.2.0+20240530/bin/../lib/gcc/riscv32-esp-elf/13.2.0/../../../../riscv32-esp-elf/bin/ld: .pio/build/seeed_xiao_esp32_c6/libFrameworkArduino.a(esp32-hal-i2c-slave.c.o): in function `i2cSlaveInit':
/Users/myname/.platformio/packages/framework-arduinoespressif32/cores/esp32/esp32-hal-i2c-slave.c:319:(.text.i2cSlaveInit+0x38c): undefined reference to `i2c_ll_slave_init'
/Users/myname/.platformio/packages/toolchain-riscv32-esp@13.2.0+20240530/bin/../lib/gcc/riscv32-esp-elf/13.2.0/../../../../riscv32-esp-elf/bin/ld: /Users/schino/.platformio/packages/framework-arduinoespressif32/cores/esp32/esp32-hal-i2c-slave.c:319:(.text.i2cSlaveInit+0x39a): undefined reference to `i2c_ll_slave_set_fifo_mode'
/Users/myname/.platformio/packages/toolchain-riscv32-esp@13.2.0+20240530/bin/../lib/gcc/riscv32-esp-elf/13.2.0/../../../../riscv32-esp-elf/bin/ld: /Users/schino/.platformio/packages/framework-arduinoespressif32/cores/esp32/esp32-hal-i2c-slave.c:346:(.text.i2cSlaveInit+0x7e2): undefined reference to `i2c_ll_slave_set_fifo_mode'
collect2: error: ld returned 1 exit status
*** [.pio/build/seeed_xiao_esp32_c6/firmware.elf] Error 1

[jose3ww]

also it's showing several compilation warnings as follows. Just for your reference.

Compiling .pio/build/seeed_xiao_esp32_c6/libf4b/WiFi/STA.cpp.o
/Users/myname/.platformio/packages/framework-arduinoespressif32/libraries/Network/src/NetworkClient.cpp:26: warning: "IN6_IS_ADDR_V4MAPPED" redefined
   26 | #define IN6_IS_ADDR_V4MAPPED(a) ((((__const uint32_t *)(a))[0] == 0) && (((__const uint32_t *)(a))[1] == 0) && (((__const uint32_t *)(a))[2] == htonl(0xffff)))
      | 
In file included from /Users/schino/.platformio/packages/framework-arduinoespressif32/tools/esp32-arduino-libs/esp32c6/include/lwip/lwip/src/include/lwip/sockets.h:53,
                 from /Users/schino/.platformio/packages/framework-arduinoespressif32/tools/esp32-arduino-libs/esp32c6/include/lwip/include/lwip/sockets.h:8,
                 from /Users/schino/.platformio/packages/framework-arduinoespressif32/libraries/Network/src/NetworkClient.cpp:22:
/Users/myname/.platformio/packages/framework-arduinoespressif32/tools/esp32-arduino-libs/esp32c6/include/lwip/lwip/src/include/lwip/inet.h:133: note: this is the location of the previous definition
  133 | #define IN6_IS_ADDR_V4MAPPED(a)     ip6_addr_isipv4mappedipv6((ip6_addr_t*)(a))
      | 

Compiling .pio/build/seeed_xiao_esp32_c6/FrameworkArduino/esp32-hal-misc.c.o
/Users/myname/.platformio/packages/framework-arduinoespressif32/cores/esp32/esp32-hal-i2c-slave.c: In function 'i2cSlaveInit':
/Users/myname/.platformio/packages/framework-arduinoespressif32/cores/esp32/esp32-hal-i2c-slave.c:338:3: warning: implicit declaration of function 'i2c_ll_slave_init'; did you mean 'i2c_ll_slave_rw'? [-Wimplicit-function-declaration]
  338 |   i2c_ll_slave_init(i2c->dev);
      |   ^~~~~~~~~~~~~~~~~
      |   i2c_ll_slave_rw
Compiling .pio/build/seeed_xiao_esp32_c6/FrameworkArduino/esp32-hal-periman.c.o
/Users/myname/.platformio/packages/framework-arduinoespressif32/cores/esp32/esp32-hal-i2c-slave.c:339:3: warning: implicit declaration of function 'i2c_ll_slave_set_fifo_mode'; did you mean 'i2c_ll_enable_fifo_mode'? [-Wimplicit-function-declaration]
  339 |   i2c_ll_slave_set_fifo_mode(i2c->dev, true);
      |   ^~~~~~~~~~~~~~~~~~~~~~~~~~
      |   i2c_ll_enable_fifo_mode

Compiling .pio/build/seeed_xiao_esp32_c6/FrameworkArduino/wiring_pulse.c.o
/Users/myname/.platformio/packages/framework-arduinoespressif32/cores/esp32/freertos_stats.cpp: In function 'void printRunningTasks(Print&)':
/Users/myname/.platformio/packages/framework-arduinoespressif32/cores/esp32/freertos_stats.cpp:72:34: warning: '++' expression of 'volatile'-qualified type is deprecated [-Wvolatile]
   72 |     for (x = 0; x < uxArraySize; x++) {
      |                                  ^

[jose3ww]

FYI .platformio/packages/framework-arduinoespressif32 and each contents under .platformio/.cache/ were deleted before the build.