ESP32 AsyncWebServer

Question

I currently trying to setup an Async Web Server on the ESP32. But unfortunately I don't get the code to run. I'm usign platform io on windows 10.

#include <Arduino.h>
#include <ESPAsyncWebServer.h>

const char* ssid = "myAP";
const char* password = "123456789";

AsyncWebServer server(80);

setup() and loop() are empty. If I try to compile the code these message shows up.

compilation terminated.
C:\Users\x\.platformio\lib\ESPAsyncTCP_ID305\src\AsyncPrinter.cpp: In constructor 'AsyncPrinter::AsyncPrinter(AsyncClient*, size_t)':
C:\Users\xanix\.platformio\lib\ESPAsyncTCP_ID305\src\AsyncPrinter.cpp:48:11: error: 'panic' was not declared in this scope
     panic(); //What should we do?
           ^
C:\Users\x\.platformio\lib\ESPAsyncTCP_ID305\src\AsyncPrinter.cpp: In member function 'int AsyncPrinter::connect(IPAddress, uint16_t)':
C:\Users\xanix\.platformio\lib\ESPAsyncTCP_ID305\src\AsyncPrinter.cpp:71:11: error: 'panic' was not declared in this scope
     panic();
           ^
C:\Users\x\.platformio\lib\ESPAsyncTCP_ID305\src\AsyncPrinter.cpp: In member function 'size_t AsyncPrinter::_sendBuffer()':
C:\Users\xanix\.platformio\lib\ESPAsyncTCP_ID305\src\AsyncPrinter.cpp:182:11: error: 'panic' was not declared in this scope
     panic(); // Connection should be aborted instead
           ^
                       ^
C:\Users\x\.platformio\lib\ESPAsyncTCP_ID305\src\ESPAsyncTCPbuffer.cpp: In member function 'size_t AsyncTCPbuffer::_handleRxBuffer(uint8_t*, size_t)':
C:\Users\xanix\.platformio\lib\ESPAsyncTCP_ID305\src\ESPAsyncTCPbuffer.cpp:469:21: error: 'panic' was not declared in this scope
               panic(); //TODO: What action should this be ?

C:\Users\x\.platformio\lib\ESPAsyncTCP_ID305\src\ESPAsyncTCP.cpp: In member function 'bool AsyncClient::operator==(const AsyncClient&)':
C:\Users\xanix\.platformio\lib\ESPAsyncTCP_ID305\src\ESPAsyncTCP.cpp:331:66: error: 'ip_addr_t {aka struct ip_addr}' has no membec
r named 'addr'
   return (_pcb != NULL && other._pcb != NULL && (_pcb->remote_ip.addr == other._pcb->remote_ip.addr) && (_pcb->remote_port == other._pcb->remote_port));
                                                                  ^
C:\Users\x\.platformio\lib\ESPAsyncTCP_ID305\src\ESPAsyncTCP.cpp: In member function 'void AsyncClient::_dns_found(const ip_addr*)':
C:\Users\xanix\.platformio\lib\ESPAsyncTCP_ID305\src\ESPAsyncTCP.cpp:707:31: error: 'const struct ip_addr' has no member named 'addr'
     connect(IPAddress(ipaddr->addr), _connect_port);
                               ^
C:\Users\x\.platformio\lib\ESPAsyncTCP_ID305\src\ESPAsyncTCP.cpp: In member function 'uint32_t AsyncClient::getRemoteAddress()':
C:\Users\xanix\.platformio\lib\ESPAsyncTCP_ID305\src\ESPAsyncTCP.cpp:837:26: error: 'ip_addr_t {aka struct ip_addr}' has no member named 'addr'
   return _pcb->remote_ip.addr;
                          ^
C:\Users\x\.platformio\lib\ESPAsyncTCP_ID305\src\ESPAsyncTCP.cpp: In member function 'uint32_t AsyncClient::getLocalAddress()':
C:\Users\xanix\.platformio\lib\ESPAsyncTCP_ID305\src\ESPAsyncTCP.cpp:849:25: error: 'ip_addr_t {aka struct ip_addr}' has no member named 'addr'
   return _pcb->local_ip.addr;
                         ^
C:\Users\x\.platformio\lib\ESPAsyncTCP_ID305\src\ESPAsyncTCP.cpp: In member function 'void AsyncServer::begin()':
C:\Users\xanix\.platformio\lib\ESPAsyncTCP_ID305\src\ESPAsyncTCP.cpp:1122:14: error: 'ip_addr_t {aka struct ip_addr}' has no member named 'addr'
   local_addr.addr = (uint32_t) _addr;
              ^

Answer 1

You're using the wrong async TCP library. The one you're using is for the ESP8266, not the ESP32.

Here's its PlatformIO library registry entry:

https://platformio.org/lib/show/305/ESPAsyncTCP

You're seeing errors because it's trying to call functions that are available on the ESP8266 and not the ESP32.

You want the AsyncTCP library:

https://platformio.org/lib/show/1826/AsyncTCP

You should update your platformio.lib file to include this library instead of ESPAsyncTCP. You may also need to remove the build or library directory to get rid of the old library.

Answer 2

had the same issue, downgrading the core of PlatformIO solved for me the issue.

pip install -U "platformio<4.2.0"