Won't Complie on ESP32

[fabltd]

• Arduino board: featheresp32

• Arduino IDE version (found in Arduino -> About Arduino menu): Platform IO

Trying to run the code from the ESP 32 secure example. Compile fails:

In file included from /Users/jeremy/.platformio/packages/framework-arduinoespressif32/cores/esp32/Arduino.h:176,
                 from .pio/libdeps/featheresp32/Adafruit MQTT Library/Adafruit_MQTT.h:25,
                 from .pio/libdeps/featheresp32/Adafruit MQTT Library/Adafruit_MQTT.cpp:22:
.pio/libdeps/featheresp32/Adafruit MQTT Library/Adafruit_MQTT.cpp: In member function 'const __FlashStringHelper* Adafruit_MQTT::connectErrorString(int8_t)':
/Users/jeremy/.platformio/packages/framework-arduinoespressif32/cores/esp32/WString.h:38:42: error: cannot convert 'const char*' to 'const __FlashStringHelper*' in return
 #define F(string_literal) (string_literal)
                                          ^
.pio/libdeps/featheresp32/Adafruit MQTT Library/Adafruit_MQTT.cpp:333:12: note: in expansion of macro 'F'
     return F(
            ^
/Users/jeremy/.platformio/packages/framework-arduinoespressif32/cores/esp32/WString.h:38:42: error: cannot convert 'const char*' to 'const __FlashStringHelper*' in return
 #define F(string_literal) (string_literal)
                                          ^
.pio/libdeps/featheresp32/Adafruit MQTT Library/Adafruit_MQTT.cpp:336:12: note: in expansion of macro 'F'
     return F(
            ^
/Users/jeremy/.platformio/packages/framework-arduinoespressif32/cores/esp32/WString.h:38:42: error: cannot convert 'const char*' to 'const __FlashStringHelper*' in return
 #define F(string_literal) (string_literal)
                                          ^
.pio/libdeps/featheresp32/Adafruit MQTT Library/Adafruit_MQTT.cpp:339:12: note: in expansion of macro 'F'
     return F("The MQTT service is unavailable");
            ^
/Users/jeremy/.platformio/packages/framework-arduinoespressif32/cores/esp32/WString.h:38:42: error: cannot convert 'const char*' to 'const __FlashStringHelper*' in return
 #define F(string_literal) (string_literal)
                                          ^
.pio/libdeps/featheresp32/Adafruit MQTT Library/Adafruit_MQTT.cpp:341:12: note: in expansion of macro 'F'
     return F("The data in the user name or password is malformed");
            ^
/Users/jeremy/.platformio/packages/framework-arduinoespressif32/cores/esp32/WString.h:38:42: error: cannot convert 'const char*' to 'const __FlashStringHelper*' in return
 #define F(string_literal) (string_literal)
                                          ^
.pio/libdeps/featheresp32/Adafruit MQTT Library/Adafruit_MQTT.cpp:343:12: note: in expansion of macro 'F'
     return F("Not authorized to connect");
            ^
/Users/jeremy/.platformio/packages/framework-arduinoespressif32/cores/esp32/WString.h:38:42: error: cannot convert 'const char*' to 'const __FlashStringHelper*' in return
 #define F(string_literal) (string_literal)
                                          ^
.pio/libdeps/featheresp32/Adafruit MQTT Library/Adafruit_MQTT.cpp:345:12: note: in expansion of macro 'F'
     return F("Exceeded reconnect rate limit. Please try again later.");
            ^
/Users/jeremy/.platformio/packages/framework-arduinoespressif32/cores/esp32/WString.h:38:42: error: cannot convert 'const char*' to 'const __FlashStringHelper*' in return
 #define F(string_literal) (string_literal)
                                          ^
.pio/libdeps/featheresp32/Adafruit MQTT Library/Adafruit_MQTT.cpp:347:12: note: in expansion of macro 'F'
     return F("You have been banned from connecting. Please contact the MQTT "
            ^
/Users/jeremy/.platformio/packages/framework-arduinoespressif32/cores/esp32/WString.h:38:42: error: cannot convert 'const char*' to 'const __FlashStringHelper*' in return
 #define F(string_literal) (string_literal)
                                          ^
.pio/libdeps/featheresp32/Adafruit MQTT Library/Adafruit_MQTT.cpp:350:12: note: in expansion of macro 'F'
     return F("Connection failed");
            ^
/Users/jeremy/.platformio/packages/framework-arduinoespressif32/cores/esp32/WString.h:38:42: error: cannot convert 'const char*' to 'const __FlashStringHelper*' in return
 #define F(string_literal) (string_literal)
                                          ^
.pio/libdeps/featheresp32/Adafruit MQTT Library/Adafruit_MQTT.cpp:352:12: note: in expansion of macro 'F'
     return F("Failed to subscribe");
            ^
/Users/jeremy/.platformio/packages/framework-arduinoespressif32/cores/esp32/WString.h:38:42: error: cannot convert 'const char*' to 'const __FlashStringHelper*' in return
 #define F(string_literal) (string_literal)
                                          ^
.pio/libdeps/featheresp32/Adafruit MQTT Library/Adafruit_MQTT.cpp:354:12: note: in expansion of macro 'F'
     return F("Unknown error");
            ^
Archiving .pio/build/featheresp32/libc73/libSPIFFS.a
Indexing .pio/build/featheresp32/libc73/libSPIFFS.a
Archiving .pio/build/featheresp32/libc35/libSPI.a
Indexing .pio/build/featheresp32/libc35/libSPI.a
Compiling .pio/build/featheresp32/lib6d3/WiFi101/WiFi.cpp.o
Compiling .pio/build/featheresp32/lib6d3/WiFi101/WiFiClient.cpp.o
Compiling .pio/build/featheresp32/lib6d3/WiFi101/WiFiMDNSResponder.cpp.o
Compiling .pio/build/featheresp32/lib6d3/WiFi101/WiFiSSLClient.cpp.o
*** [.pio/build/featheresp32/lib70f/Adafruit MQTT Library/Adafruit_MQTT.cpp.o] Error 1
In file included from /Users/jeremy/.platformio/packages/framework-arduinoespressif32/tools/sdk/esp32/include/newlib/platform_include/sys/unistd.h:23,
                 from /Users/jeremy/.platformio/packages/toolchain-xtensa-esp32/xtensa-esp32-elf/sys-include/unistd.h:4,
                 from /Users/jeremy/.platformio/packages/toolchain-xtensa-esp32/xtensa-esp32-elf/sys-include/pthread.h:25,
                 from /Users/jeremy/.platformio/packages/framework-arduinoespressif32/tools/sdk/esp32/include/newlib/platform_include/pthread.h:21,
                 from /Users/jeremy/.platformio/packages/toolchain-xtensa-esp32/xtensa-esp32-elf/include/c++/8.4.0/xtensa-esp32-elf/no-rtti/bits/gthr-default.h:48,
                 from /Users/jeremy/.platformio/packages/toolchain-xtensa-esp32/xtensa-esp32-elf/include/c++/8.4.0/xtensa-esp32-elf/no-rtti/bits/gthr.h:151,
                 from /Users/jeremy/.platformio/packages/toolchain-xtensa-esp32/xtensa-esp32-elf/include/c++/8.4.0/ext/atomicity.h:35,
                 from /Users/jeremy/.platformio/packages/toolchain-xtensa-esp32/xtensa-esp32-elf/include/c++/8.4.0/bits/basic_string.h:39,
                 from /Users/jeremy/.platformio/packages/toolchain-xtensa-esp32/xtensa-esp32-elf/include/c++/8.4.0/string:52,
                 from /Users/jeremy/.platformio/packages/toolchain-xtensa-esp32/xtensa-esp32-elf/include/c++/8.4.0/stdexcept:39,
                 from /Users/jeremy/.platformio/packages/toolchain-xtensa-esp32/xtensa-esp32-elf/include/c++/8.4.0/array:39,
                 from /Users/jeremy/.platformio/packages/toolchain-xtensa-esp32/xtensa-esp32-elf/include/c++/8.4.0/tuple:39,
                 from /Users/jeremy/.platformio/packages/toolchain-xtensa-esp32/xtensa-esp32-elf/include/c++/8.4.0/functional:54,
                 from /Users/jeremy/.platformio/packages/framework-arduinoespressif32/cores/esp32/HardwareSerial.h:49,
                 from /Users/jeremy/.platformio/packages/framework-arduinoespressif32/cores/esp32/Arduino.h:184,
                 from .pio/libdeps/featheresp32/WiFi101/src/utility/WiFiSocket.h:28,
                 from .pio/libdeps/featheresp32/WiFi101/src/WiFi.cpp:36:
/Users/jeremy/.platformio/packages/toolchain-xtensa-esp32/xtensa-esp32-elf/sys-include/sys/unistd.h:30:9: error: conflicting declaration of C function 'int close(int)'
 int     close (int __fildes);
         ^~~~~
In file included from .pio/libdeps/featheresp32/WiFi101/src/utility/WiFiSocket.h:24,
                 from .pio/libdeps/featheresp32/WiFi101/src/WiFi.cpp:36:
.pio/libdeps/featheresp32/WiFi101/src/socket/include/socket.h:1839:15: note: previous declaration 'sint8 close(SOCKET)'
 NMI_API sint8 close(SOCKET sock);
               ^~~~~
In file included from /Users/jeremy/.platformio/packages/framework-arduinoespressif32/tools/sdk/esp32/include/newlib/platform_include/sys/unistd.h:23,
                 from /Users/jeremy/.platformio/packages/toolchain-xtensa-esp32/xtensa-esp32-elf/sys-include/unistd.h:4,
                 from /Users/jeremy/.platformio/packages/toolchain-xtensa-esp32/xtensa-esp32-elf/sys-include/pthread.h:25,
                 from /Users/jeremy/.platformio/packages/framework-arduinoespressif32/tools/sdk/esp32/include/newlib/platform_include/pthread.h:21,
                 from /Users/jeremy/.platformio/packages/toolchain-xtensa-esp32/xtensa-esp32-elf/include/c++/8.4.0/xtensa-esp32-elf/no-rtti/bits/gthr-default.h:48,
                 from /Users/jeremy/.platformio/packages/toolchain-xtensa-esp32/xtensa-esp32-elf/include/c++/8.4.0/xtensa-esp32-elf/no-rtti/bits/gthr.h:151,
                 from /Users/jeremy/.platformio/packages/toolchain-xtensa-esp32/xtensa-esp32-elf/include/c++/8.4.0/ext/atomicity.h:35,
                 from /Users/jeremy/.platformio/packages/toolchain-xtensa-esp32/xtensa-esp32-elf/include/c++/8.4.0/bits/basic_string.h:39,
                 from /Users/jeremy/.platformio/packages/toolchain-xtensa-esp32/xtensa-esp32-elf/include/c++/8.4.0/string:52,
                 from /Users/jeremy/.platformio/packages/toolchain-xtensa-esp32/xtensa-esp32-elf/include/c++/8.4.0/stdexcept:39,
                 from /Users/jeremy/.platformio/packages/toolchain-xtensa-esp32/xtensa-esp32-elf/include/c++/8.4.0/array:39,
                 from /Users/jeremy/.platformio/packages/toolchain-xtensa-esp32/xtensa-esp32-elf/include/c++/8.4.0/tuple:39,
                 from /Users/jeremy/.platformio/packages/toolchain-xtensa-esp32/xtensa-esp32-elf/include/c++/8.4.0/functional:54,
                 from /Users/jeremy/.platformio/packages/framework-arduinoespressif32/cores/esp32/HardwareSerial.h:49,
                 from /Users/jeremy/.platformio/packages/framework-arduinoespressif32/cores/esp32/Arduino.h:184,
                 from .pio/libdeps/featheresp32/WiFi101/src/utility/WiFiSocket.h:28,
                 from .pio/libdeps/featheresp32/WiFi101/src/WiFiClient.cpp:20:
/Users/jeremy/.platformio/packages/toolchain-xtensa-esp32/xtensa-esp32-elf/sys-include/sys/unistd.h:30:9: error: conflicting declaration of C function 'int close(int)'
 int     close (int __fildes);
         ^~~~~
In file included from .pio/libdeps/featheresp32/WiFi101/src/utility/WiFiSocket.h:24,
                 from .pio/libdeps/featheresp32/WiFi101/src/WiFiClient.cpp:20:
.pio/libdeps/featheresp32/WiFi101/src/socket/include/socket.h:1839:15: note: previous declaration 'sint8 close(SOCKET)'
 NMI_API sint8 close(SOCKET sock);
               ^~~~~
.pio/libdeps/featheresp32/WiFi101/src/WiFi.cpp: In member function 'int WiFiClass::init()':
.pio/libdeps/featheresp32/WiFi101/src/WiFi.cpp:303:36: error: invalid conversion from 'void (*)(uint8_t*, uint32_t)' {aka 'void (*)(unsigned char*, unsigned int)'} to 'tpfAppResolveCb' {aka 'void (*)(unsigned char*, long unsigned int)'} [-fpermissive]
  registerSocketCallback(socket_cb, resolve_cb);
                                    ^~~~~~~~~~
In file included from .pio/libdeps/featheresp32/WiFi101/src/utility/WiFiSocket.h:24,
                 from .pio/libdeps/featheresp32/WiFi101/src/WiFi.cpp:36:
.pio/libdeps/featheresp32/WiFi101/src/socket/include/socket.h:1047:79: note:   initializing argument 2 of 'void registerSocketCallback(tpfAppSocketCb, tpfAppResolveCb)'
 NMI_API void registerSocketCallback(tpfAppSocketCb socket_cb, tpfAppResolveCb resolve_cb);
                                                               ~~~~~~~~~~~~~~~~^~~~~~~~~~
.pio/libdeps/featheresp32/WiFi101/src/WiFi.cpp: At global scope:
.pio/libdeps/featheresp32/WiFi101/src/WiFi.cpp:1133:10: error: no declaration matches 'uint32_t WiFiClass::getTime()'
 uint32_t WiFiClass::getTime()
          ^~~~~~~~~
In file included from .pio/libdeps/featheresp32/WiFi101/src/WiFi.cpp:38:
.pio/libdeps/featheresp32/WiFi101/src/WiFi101.h:157:16: note: candidate is: 'long unsigned int WiFiClass::getTime()'
  unsigned long getTime();
                ^~~~~~~
.pio/libdeps/featheresp32/WiFi101/src/WiFi101.h:79:7: note: 'class WiFiClass' defined here
 class WiFiClass
       ^~~~~~~~~
*** [.pio/build/featheresp32/lib6d3/WiFi101/WiFi.cpp.o] Error 1
*** [.pio/build/featheresp32/lib6d3/WiFi101/WiFiClient.cpp.o] Error 1
In file included from .pio/libdeps/featheresp32/WiFi101/src/WiFiClient.h:28,
                 from .pio/libdeps/featheresp32/WiFi101/src/WiFi101.h:35,
                 from .pio/libdeps/featheresp32/WiFi101/src/WiFiMDNSResponder.h:27,
                 from .pio/libdeps/featheresp32/WiFi101/src/WiFiMDNSResponder.cpp:32:
.pio/libdeps/featheresp32/WiFi101/src/socket/include/socket.h:1839:15: error: conflicting declaration of C function 'sint8 close(SOCKET)'
 NMI_API sint8 close(SOCKET sock);
               ^~~~~
In file included from /Users/jeremy/.platformio/packages/framework-arduinoespressif32/tools/sdk/esp32/include/newlib/platform_include/sys/unistd.h:23,
                 from /Users/jeremy/.platformio/packages/toolchain-xtensa-esp32/xtensa-esp32-elf/sys-include/unistd.h:4,
                 from /Users/jeremy/.platformio/packages/toolchain-xtensa-esp32/xtensa-esp32-elf/sys-include/pthread.h:25,
                 from /Users/jeremy/.platformio/packages/framework-arduinoespressif32/tools/sdk/esp32/include/newlib/platform_include/pthread.h:21,
                 from /Users/jeremy/.platformio/packages/toolchain-xtensa-esp32/xtensa-esp32-elf/include/c++/8.4.0/xtensa-esp32-elf/no-rtti/bits/gthr-default.h:48,
                 from /Users/jeremy/.platformio/packages/toolchain-xtensa-esp32/xtensa-esp32-elf/include/c++/8.4.0/xtensa-esp32-elf/no-rtti/bits/gthr.h:151,
                 from /Users/jeremy/.platformio/packages/toolchain-xtensa-esp32/xtensa-esp32-elf/include/c++/8.4.0/ext/atomicity.h:35,
                 from /Users/jeremy/.platformio/packages/toolchain-xtensa-esp32/xtensa-esp32-elf/include/c++/8.4.0/bits/basic_string.h:39,
                 from /Users/jeremy/.platformio/packages/toolchain-xtensa-esp32/xtensa-esp32-elf/include/c++/8.4.0/string:52,
                 from /Users/jeremy/.platformio/packages/toolchain-xtensa-esp32/xtensa-esp32-elf/include/c++/8.4.0/stdexcept:39,
                 from /Users/jeremy/.platformio/packages/toolchain-xtensa-esp32/xtensa-esp32-elf/include/c++/8.4.0/array:39,
                 from /Users/jeremy/.platformio/packages/toolchain-xtensa-esp32/xtensa-esp32-elf/include/c++/8.4.0/tuple:39,
                 from /Users/jeremy/.platformio/packages/toolchain-xtensa-esp32/xtensa-esp32-elf/include/c++/8.4.0/functional:54,
                 from /Users/jeremy/.platformio/packages/framework-arduinoespressif32/cores/esp32/HardwareSerial.h:49,
                 from /Users/jeremy/.platformio/packages/framework-arduinoespressif32/cores/esp32/Arduino.h:184,
                 from .pio/libdeps/featheresp32/WiFi101/src/WiFiMDNSResponder.cpp:31:
/Users/jeremy/.platformio/packages/toolchain-xtensa-esp32/xtensa-esp32-elf/sys-include/sys/unistd.h:30:9: note: previous declaration 'int close(int)'
 int     close (int __fildes);
         ^~~~~
In file included from .pio/libdeps/featheresp32/WiFi101/src/WiFiClient.h:28,
                 from .pio/libdeps/featheresp32/WiFi101/src/WiFiSSLClient.h:23,
                 from .pio/libdeps/featheresp32/WiFi101/src/WiFiSSLClient.cpp:20:
.pio/libdeps/featheresp32/WiFi101/src/socket/include/socket.h:1839:15: error: conflicting declaration of C function 'sint8 close(SOCKET)'
 NMI_API sint8 close(SOCKET sock);
               ^~~~~
In file included from /Users/jeremy/.platformio/packages/framework-arduinoespressif32/tools/sdk/esp32/include/newlib/platform_include/sys/unistd.h:23,
                 from /Users/jeremy/.platformio/packages/toolchain-xtensa-esp32/xtensa-esp32-elf/sys-include/unistd.h:4,
                 from /Users/jeremy/.platformio/packages/toolchain-xtensa-esp32/xtensa-esp32-elf/sys-include/pthread.h:25,
                 from /Users/jeremy/.platformio/packages/framework-arduinoespressif32/tools/sdk/esp32/include/newlib/platform_include/pthread.h:21,
                 from /Users/jeremy/.platformio/packages/toolchain-xtensa-esp32/xtensa-esp32-elf/include/c++/8.4.0/xtensa-esp32-elf/no-rtti/bits/gthr-default.h:48,
                 from /Users/jeremy/.platformio/packages/toolchain-xtensa-esp32/xtensa-esp32-elf/include/c++/8.4.0/xtensa-esp32-elf/no-rtti/bits/gthr.h:151,
                 from /Users/jeremy/.platformio/packages/toolchain-xtensa-esp32/xtensa-esp32-elf/include/c++/8.4.0/ext/atomicity.h:35,
                 from /Users/jeremy/.platformio/packages/toolchain-xtensa-esp32/xtensa-esp32-elf/include/c++/8.4.0/bits/basic_string.h:39,
                 from /Users/jeremy/.platformio/packages/toolchain-xtensa-esp32/xtensa-esp32-elf/include/c++/8.4.0/string:52,
                 from /Users/jeremy/.platformio/packages/toolchain-xtensa-esp32/xtensa-esp32-elf/include/c++/8.4.0/stdexcept:39,
                 from /Users/jeremy/.platformio/packages/toolchain-xtensa-esp32/xtensa-esp32-elf/include/c++/8.4.0/array:39,
                 from /Users/jeremy/.platformio/packages/toolchain-xtensa-esp32/xtensa-esp32-elf/include/c++/8.4.0/tuple:39,
                 from /Users/jeremy/.platformio/packages/toolchain-xtensa-esp32/xtensa-esp32-elf/include/c++/8.4.0/functional:54,
                 from /Users/jeremy/.platformio/packages/framework-arduinoespressif32/cores/esp32/HardwareSerial.h:49,
                 from /Users/jeremy/.platformio/packages/framework-arduinoespressif32/cores/esp32/Arduino.h:184,
                 from .pio/libdeps/featheresp32/WiFi101/src/WiFiClient.h:23,
                 from .pio/libdeps/featheresp32/WiFi101/src/WiFiSSLClient.h:23,
                 from .pio/libdeps/featheresp32/WiFi101/src/WiFiSSLClient.cpp:20:
/Users/jeremy/.platformio/packages/toolchain-xtensa-esp32/xtensa-esp32-elf/sys-include/sys/unistd.h:30:9: note: previous declaration 'int close(int)'
 int     close (int __fildes);
         ^~~~~
*** [.pio/build/featheresp32/lib6d3/WiFi101/WiFiMDNSResponder.cpp.o] Error 1
*** [.pio/build/featheresp32/lib6d3/WiFi101/WiFiSSLClient.cpp.o] Error 1

Here is the example sketch:

#include <WiFi.h>
#include <WiFiClientSecure.h>
#include "Adafruit_MQTT.h"
#include "Adafruit_MQTT_Client.h"

#define AIO_SERVER      "x"
#define AIO_USERNAME "x"
#define AIO_KEY      "x"

const char *mqtt_root_cert = REDACTED

WiFiClientSecure client;
Adafruit_MQTT_Client mqtt(&client, AIO_SERVER, 8883, AIO_USERNAME, AIO_KEY);

void setup() {
  Serial.begin(115200);
 
 while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }

  Serial.println("You're connected to the network");
  Serial.println();

// MQTT CERT
client.setCACert(mqtt_root_cert);
}

void mqtt_connect(){

int8_t ret;

  // Stop if already connected.
  if (mqtt.connected()) {
    return;
  }

  Serial.print("Connecting to MQTT... ");

  uint8_t retries = 3;
  while ((ret = mqtt.connect()) != 0) { // connect will return 0 for connected
       Serial.println(mqtt.connectErrorString(ret));
       Serial.println("Retrying MQTT connection in 5 seconds...");
       mqtt.disconnect();
       delay(5000);  // wait 5 seconds
       retries--;
       if (retries == 0) {
         // basically die and wait for WDT to reset me
         while (1);
       }
  }

  Serial.println("MQTT Connected!");
}

void mqtt_loop(){
   // Now we can publish stuff!
  Serial.print(F("\nSending val "));
  Serial.print(x);
  Serial.print(F(" to test feed..."));
  if (! test.publish(x++)) {
    Serial.println(F("Failed"));
  } else {
    Serial.println(F("OK!"));
  }

  // wait a couple seconds to avoid rate limit
  delay(2000);
}


void loop() {
    
  mqtt_connect();
  mqtt_loop();
 
}

[arnib13]

I have the same issue, Seeed ESP32C3.

Downgrading to adafruit/Adafruit MQTT Library@=2.5.3 makes it compile.