Platform
ESP8266
IDE / Tooling
Arduino (IDE/CLI)
What happened?
I'm using Arduino IDE, Version: 2.3.5, Date: 2025-04-02T13:16:49.885Z, CLI Version: 1.2.0 with a NodeMCU ESP8266 and ESP Async WebServer, version 3.7.7.
I'm trying to compile the WebSocket example I get the following error:
`FQBN: esp8266:esp8266:nodemcuv2
Using board 'nodemcuv2' from platform in folder: C:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2
Using core 'esp8266' from platform in folder: C:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2
Detecting libraries used...
<--- snip -->
Compiling sketch...
"C:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\tools\python3\3.7.2-post1/python3" -I "C:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2/tools/signing.py" --mode header --publickey "C:\Users\aramp\AppData\Local\Temp\.arduinoIDE-unsaved2025411-2300-1027oqz.tra3\WebSocket/public.key" --out "C:\Users\aramp\AppData\Local\arduino\sketches\D3B0F7D0C4C9868042F85F60273FB0C6/core/Updater_Signing.h"
"C:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\tools\xtensa-lx106-elf-gcc\3.0.4-gcc10.3-1757bed/bin/xtensa-lx106-elf-g++" -D__ets__ -DICACHE_FLASH -U__STRICT_ANSI__ -D_GNU_SOURCE "-IC:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2/tools/sdk/include" "-IC:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2/tools/sdk/lwip2/include" "-IC:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2/tools/sdk/libc/xtensa-lx106-elf/include" "-IC:\Users\aramp\AppData\Local\arduino\sketches\D3B0F7D0C4C9868042F85F60273FB0C6/core" -c -Werror=return-type -Os -g -free -fipa-pta -mlongcalls -mtext-section-literals -fno-rtti -falign-functions=4 -std=gnu++17 -MMD -ffunction-sections -fdata-sections -fno-exceptions -DMMU_IRAM_SIZE=0x8000 -DMMU_ICACHE_SIZE=0x8000 -DNONOSDK22x_190703=1 -DF_CPU=80000000L -DLWIP_OPEN_SRC -DTCP_MSS=536 -DLWIP_FEATURES=1 -DLWIP_IPV6=0 -DARDUINO=10607 -DARDUINO_ESP8266_NODEMCU_ESP12E -DARDUINO_ARCH_ESP8266 "-DARDUINO_BOARD="ESP8266_NODEMCU_ESP12E"" -DLED_BUILTIN=2 -DFLASHMODE_DIO -DESP8266 "-IC:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\cores\esp8266" "-IC:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\variants\nodemcu" "-IC:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\libraries\ESP8266WiFi\src" "-Ic:\Users\aramp\Documents\Arduino\libraries\ESPAsyncTCP\src" "-Ic:\Users\aramp\Documents\Arduino\libraries\ESP_Async_WebServer\src" "-IC:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\libraries\Hash\src" "C:\Users\aramp\AppData\Local\arduino\sketches\D3B0F7D0C4C9868042F85F60273FB0C6\sketch\WebSocket.ino.cpp" -o "C:\Users\aramp\AppData\Local\arduino\sketches\D3B0F7D0C4C9868042F85F60273FB0C6\sketch\WebSocket.ino.cpp.o"
In file included from c:\Users\aramp\Documents\Arduino\libraries\ESP_Async_WebServer\src/ESPAsyncWebServer.h:9,
from C:\Users\aramp\AppData\Local\Temp.arduinoIDE-unsaved2025411-2300-1027oqz.tra3\WebSocket\WebSocket.ino:20:
C:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2/tools/sdk/lwip2/include/lwip/tcpbase.h:57:17: error: 'CLOSED' conflicts with a previous declaration
57 | CLOSED = 0,
| ^
In file included from C:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\libraries\ESP8266WiFi\src/ESP8266WiFi.h:28,
from C:\Users\aramp\AppData\Local\Temp.arduinoIDE-unsaved2025411-2300-1027oqz.tra3\WebSocket\WebSocket.ino:13:
C:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\cores\esp8266/wl_definitions.h:74:3: note: previous declaration 'wl_tcp_state CLOSED'
74 | CLOSED = 0,
| ^~~~~~
In file included from c:\Users\aramp\Documents\Arduino\libraries\ESP_Async_WebServer\src/ESPAsyncWebServer.h:9,
from C:\Users\aramp\AppData\Local\Temp.arduinoIDE-unsaved2025411-2300-1027oqz.tra3\WebSocket\WebSocket.ino:20:
C:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2/tools/sdk/lwip2/include/lwip/tcpbase.h:58:17: error: 'LISTEN' conflicts with a previous declaration
58 | LISTEN = 1,
| ^
In file included from C:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\libraries\ESP8266WiFi\src/ESP8266WiFi.h:28,
from C:\Users\aramp\AppData\Local\Temp.arduinoIDE-unsaved2025411-2300-1027oqz.tra3\WebSocket\WebSocket.ino:13:
C:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\cores\esp8266/wl_definitions.h:75:3: note: previous declaration 'wl_tcp_state LISTEN'
75 | LISTEN = 1,
| ^~~~~~
In file included from c:\Users\aramp\Documents\Arduino\libraries\ESP_Async_WebServer\src/ESPAsyncWebServer.h:9,
from C:\Users\aramp\AppData\Local\Temp.arduinoIDE-unsaved2025411-2300-1027oqz.tra3\WebSocket\WebSocket.ino:20:
C:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2/tools/sdk/lwip2/include/lwip/tcpbase.h:59:17: error: 'SYN_SENT' conflicts with a previous declaration
59 | SYN_SENT = 2,
| ^
In file included from C:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\libraries\ESP8266WiFi\src/ESP8266WiFi.h:28,
from C:\Users\aramp\AppData\Local\Temp.arduinoIDE-unsaved2025411-2300-1027oqz.tra3\WebSocket\WebSocket.ino:13:
C:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\cores\esp8266/wl_definitions.h:76:3: note: previous declaration 'wl_tcp_state SYN_SENT'
76 | SYN_SENT = 2,
| ^~~~~~~~
In file included from c:\Users\aramp\Documents\Arduino\libraries\ESP_Async_WebServer\src/ESPAsyncWebServer.h:9,
from C:\Users\aramp\AppData\Local\Temp.arduinoIDE-unsaved2025411-2300-1027oqz.tra3\WebSocket\WebSocket.ino:20:
C:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2/tools/sdk/lwip2/include/lwip/tcpbase.h:60:17: error: 'SYN_RCVD' conflicts with a previous declaration
60 | SYN_RCVD = 3,
| ^
In file included from C:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\libraries\ESP8266WiFi\src/ESP8266WiFi.h:28,
from C:\Users\aramp\AppData\Local\Temp.arduinoIDE-unsaved2025411-2300-1027oqz.tra3\WebSocket\WebSocket.ino:13:
C:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\cores\esp8266/wl_definitions.h:77:3: note: previous declaration 'wl_tcp_state SYN_RCVD'
77 | SYN_RCVD = 3,
| ^~~~~~~~
In file included from c:\Users\aramp\Documents\Arduino\libraries\ESP_Async_WebServer\src/ESPAsyncWebServer.h:9,
from C:\Users\aramp\AppData\Local\Temp.arduinoIDE-unsaved2025411-2300-1027oqz.tra3\WebSocket\WebSocket.ino:20:
C:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2/tools/sdk/lwip2/include/lwip/tcpbase.h:61:17: error: 'ESTABLISHED' conflicts with a previous declaration
61 | ESTABLISHED = 4,
| ^
In file included from C:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\libraries\ESP8266WiFi\src/ESP8266WiFi.h:28,
from C:\Users\aramp\AppData\Local\Temp.arduinoIDE-unsaved2025411-2300-1027oqz.tra3\WebSocket\WebSocket.ino:13:
C:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\cores\esp8266/wl_definitions.h:78:3: note: previous declaration 'wl_tcp_state ESTABLISHED'
78 | ESTABLISHED = 4,
| ^~~~~~~~~~~
In file included from c:\Users\aramp\Documents\Arduino\libraries\ESP_Async_WebServer\src/ESPAsyncWebServer.h:9,
from C:\Users\aramp\AppData\Local\Temp.arduinoIDE-unsaved2025411-2300-1027oqz.tra3\WebSocket\WebSocket.ino:20:
C:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2/tools/sdk/lwip2/include/lwip/tcpbase.h:62:17: error: 'FIN_WAIT_1' conflicts with a previous declaration
62 | FIN_WAIT_1 = 5,
| ^
In file included from C:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\libraries\ESP8266WiFi\src/ESP8266WiFi.h:28,
from C:\Users\aramp\AppData\Local\Temp.arduinoIDE-unsaved2025411-2300-1027oqz.tra3\WebSocket\WebSocket.ino:13:
C:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\cores\esp8266/wl_definitions.h:79:3: note: previous declaration 'wl_tcp_state FIN_WAIT_1'
79 | FIN_WAIT_1 = 5,
| ^~~~~~~~~~
In file included from c:\Users\aramp\Documents\Arduino\libraries\ESP_Async_WebServer\src/ESPAsyncWebServer.h:9,
from C:\Users\aramp\AppData\Local\Temp.arduinoIDE-unsaved2025411-2300-1027oqz.tra3\WebSocket\WebSocket.ino:20:
C:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2/tools/sdk/lwip2/include/lwip/tcpbase.h:63:17: error: 'FIN_WAIT_2' conflicts with a previous declaration
63 | FIN_WAIT_2 = 6,
| ^
In file included from C:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\libraries\ESP8266WiFi\src/ESP8266WiFi.h:28,
from C:\Users\aramp\AppData\Local\Temp.arduinoIDE-unsaved2025411-2300-1027oqz.tra3\WebSocket\WebSocket.ino:13:
C:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\cores\esp8266/wl_definitions.h:80:3: note: previous declaration 'wl_tcp_state FIN_WAIT_2'
80 | FIN_WAIT_2 = 6,
| ^~~~~~~~~~
In file included from c:\Users\aramp\Documents\Arduino\libraries\ESP_Async_WebServer\src/ESPAsyncWebServer.h:9,
from C:\Users\aramp\AppData\Local\Temp.arduinoIDE-unsaved2025411-2300-1027oqz.tra3\WebSocket\WebSocket.ino:20:
C:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2/tools/sdk/lwip2/include/lwip/tcpbase.h:64:17: error: 'CLOSE_WAIT' conflicts with a previous declaration
64 | CLOSE_WAIT = 7,
| ^
In file included from C:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\libraries\ESP8266WiFi\src/ESP8266WiFi.h:28,
from C:\Users\aramp\AppData\Local\Temp.arduinoIDE-unsaved2025411-2300-1027oqz.tra3\WebSocket\WebSocket.ino:13:
C:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\cores\esp8266/wl_definitions.h:81:3: note: previous declaration 'wl_tcp_state CLOSE_WAIT'
81 | CLOSE_WAIT = 7,
| ^~~~~~~~~~
In file included from c:\Users\aramp\Documents\Arduino\libraries\ESP_Async_WebServer\src/ESPAsyncWebServer.h:9,
from C:\Users\aramp\AppData\Local\Temp.arduinoIDE-unsaved2025411-2300-1027oqz.tra3\WebSocket\WebSocket.ino:20:
C:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2/tools/sdk/lwip2/include/lwip/tcpbase.h:65:17: error: 'CLOSING' conflicts with a previous declaration
65 | CLOSING = 8,
| ^
In file included from C:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\libraries\ESP8266WiFi\src/ESP8266WiFi.h:28,
from C:\Users\aramp\AppData\Local\Temp.arduinoIDE-unsaved2025411-2300-1027oqz.tra3\WebSocket\WebSocket.ino:13:
C:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\cores\esp8266/wl_definitions.h:82:3: note: previous declaration 'wl_tcp_state CLOSING'
82 | CLOSING = 8,
| ^~~~~~~
In file included from c:\Users\aramp\Documents\Arduino\libraries\ESP_Async_WebServer\src/ESPAsyncWebServer.h:9,
from C:\Users\aramp\AppData\Local\Temp.arduinoIDE-unsaved2025411-2300-1027oqz.tra3\WebSocket\WebSocket.ino:20:
C:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2/tools/sdk/lwip2/include/lwip/tcpbase.h:66:17: error: 'LAST_ACK' conflicts with a previous declaration
66 | LAST_ACK = 9,
| ^
In file included from C:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\libraries\ESP8266WiFi\src/ESP8266WiFi.h:28,
from C:\Users\aramp\AppData\Local\Temp.arduinoIDE-unsaved2025411-2300-1027oqz.tra3\WebSocket\WebSocket.ino:13:
C:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\cores\esp8266/wl_definitions.h:83:3: note: previous declaration 'wl_tcp_state LAST_ACK'
83 | LAST_ACK = 9,
| ^~~~~~~~
In file included from c:\Users\aramp\Documents\Arduino\libraries\ESP_Async_WebServer\src/ESPAsyncWebServer.h:9,
from C:\Users\aramp\AppData\Local\Temp.arduinoIDE-unsaved2025411-2300-1027oqz.tra3\WebSocket\WebSocket.ino:20:
C:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2/tools/sdk/lwip2/include/lwip/tcpbase.h:67:17: error: 'TIME_WAIT' conflicts with a previous declaration
67 | TIME_WAIT = 10
| ^~
In file included from C:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\libraries\ESP8266WiFi\src/ESP8266WiFi.h:28,
from C:\Users\aramp\AppData\Local\Temp.arduinoIDE-unsaved2025411-2300-1027oqz.tra3\WebSocket\WebSocket.ino:13:
C:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\cores\esp8266/wl_definitions.h:84:3: note: previous declaration 'wl_tcp_state TIME_WAIT'
84 | TIME_WAIT = 10
| ^~~~~~~~~
Using library ESP8266WiFi at version 1.0 in folder: C:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\libraries\ESP8266WiFi
Using library ESPAsyncTCP at version 1.2.4 in folder: C:\Users\aramp\Documents\Arduino\libraries\ESPAsyncTCP
Using library ESP Async WebServer at version 3.7.7 in folder: C:\Users\aramp\Documents\Arduino\libraries\ESP_Async_WebServer
Using library Hash at version 1.0 in folder: C:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\libraries\Hash
exit status 1
Compilation error: exit status 1`
I can compile the program by removing or commenting out lines 9 - 18 (it appears that similar lines are already in ESPAsyncWebServer.h, lines 18 - 31).
Stack Trace
Not applicable.
Minimal Reproductible Example (MRE)
Open up the WebSockets example.
I confirm that:
Platform
ESP8266
IDE / Tooling
Arduino (IDE/CLI)
What happened?
I'm using Arduino IDE, Version: 2.3.5, Date: 2025-04-02T13:16:49.885Z, CLI Version: 1.2.0 with a NodeMCU ESP8266 and ESP Async WebServer, version 3.7.7.
I'm trying to compile the WebSocket example I get the following error:
`FQBN: esp8266:esp8266:nodemcuv2
Using board 'nodemcuv2' from platform in folder: C:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2
Using core 'esp8266' from platform in folder: C:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2
Detecting libraries used...
<--- snip -->
Compiling sketch...
"C:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\tools\python3\3.7.2-post1/python3" -I "C:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2/tools/signing.py" --mode header --publickey "C:\Users\aramp\AppData\Local\Temp\.arduinoIDE-unsaved2025411-2300-1027oqz.tra3\WebSocket/public.key" --out "C:\Users\aramp\AppData\Local\arduino\sketches\D3B0F7D0C4C9868042F85F60273FB0C6/core/Updater_Signing.h"
"C:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\tools\xtensa-lx106-elf-gcc\3.0.4-gcc10.3-1757bed/bin/xtensa-lx106-elf-g++" -D__ets__ -DICACHE_FLASH -U__STRICT_ANSI__ -D_GNU_SOURCE "-IC:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2/tools/sdk/include" "-IC:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2/tools/sdk/lwip2/include" "-IC:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2/tools/sdk/libc/xtensa-lx106-elf/include" "-IC:\Users\aramp\AppData\Local\arduino\sketches\D3B0F7D0C4C9868042F85F60273FB0C6/core" -c -Werror=return-type -Os -g -free -fipa-pta -mlongcalls -mtext-section-literals -fno-rtti -falign-functions=4 -std=gnu++17 -MMD -ffunction-sections -fdata-sections -fno-exceptions -DMMU_IRAM_SIZE=0x8000 -DMMU_ICACHE_SIZE=0x8000 -DNONOSDK22x_190703=1 -DF_CPU=80000000L -DLWIP_OPEN_SRC -DTCP_MSS=536 -DLWIP_FEATURES=1 -DLWIP_IPV6=0 -DARDUINO=10607 -DARDUINO_ESP8266_NODEMCU_ESP12E -DARDUINO_ARCH_ESP8266 "-DARDUINO_BOARD="ESP8266_NODEMCU_ESP12E"" -DLED_BUILTIN=2 -DFLASHMODE_DIO -DESP8266 "-IC:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\cores\esp8266" "-IC:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\variants\nodemcu" "-IC:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\libraries\ESP8266WiFi\src" "-Ic:\Users\aramp\Documents\Arduino\libraries\ESPAsyncTCP\src" "-Ic:\Users\aramp\Documents\Arduino\libraries\ESP_Async_WebServer\src" "-IC:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\libraries\Hash\src" "C:\Users\aramp\AppData\Local\arduino\sketches\D3B0F7D0C4C9868042F85F60273FB0C6\sketch\WebSocket.ino.cpp" -o "C:\Users\aramp\AppData\Local\arduino\sketches\D3B0F7D0C4C9868042F85F60273FB0C6\sketch\WebSocket.ino.cpp.o"
In file included from c:\Users\aramp\Documents\Arduino\libraries\ESP_Async_WebServer\src/ESPAsyncWebServer.h:9,
from C:\Users\aramp\AppData\Local\Temp.arduinoIDE-unsaved2025411-2300-1027oqz.tra3\WebSocket\WebSocket.ino:20:
C:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2/tools/sdk/lwip2/include/lwip/tcpbase.h:57:17: error: 'CLOSED' conflicts with a previous declaration
57 | CLOSED = 0,
| ^
In file included from C:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\libraries\ESP8266WiFi\src/ESP8266WiFi.h:28,
from C:\Users\aramp\AppData\Local\Temp.arduinoIDE-unsaved2025411-2300-1027oqz.tra3\WebSocket\WebSocket.ino:13:
C:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\cores\esp8266/wl_definitions.h:74:3: note: previous declaration 'wl_tcp_state CLOSED'
74 | CLOSED = 0,
| ^~~~~~
In file included from c:\Users\aramp\Documents\Arduino\libraries\ESP_Async_WebServer\src/ESPAsyncWebServer.h:9,
from C:\Users\aramp\AppData\Local\Temp.arduinoIDE-unsaved2025411-2300-1027oqz.tra3\WebSocket\WebSocket.ino:20:
C:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2/tools/sdk/lwip2/include/lwip/tcpbase.h:58:17: error: 'LISTEN' conflicts with a previous declaration
58 | LISTEN = 1,
| ^
In file included from C:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\libraries\ESP8266WiFi\src/ESP8266WiFi.h:28,
from C:\Users\aramp\AppData\Local\Temp.arduinoIDE-unsaved2025411-2300-1027oqz.tra3\WebSocket\WebSocket.ino:13:
C:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\cores\esp8266/wl_definitions.h:75:3: note: previous declaration 'wl_tcp_state LISTEN'
75 | LISTEN = 1,
| ^~~~~~
In file included from c:\Users\aramp\Documents\Arduino\libraries\ESP_Async_WebServer\src/ESPAsyncWebServer.h:9,
from C:\Users\aramp\AppData\Local\Temp.arduinoIDE-unsaved2025411-2300-1027oqz.tra3\WebSocket\WebSocket.ino:20:
C:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2/tools/sdk/lwip2/include/lwip/tcpbase.h:59:17: error: 'SYN_SENT' conflicts with a previous declaration
59 | SYN_SENT = 2,
| ^
In file included from C:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\libraries\ESP8266WiFi\src/ESP8266WiFi.h:28,
from C:\Users\aramp\AppData\Local\Temp.arduinoIDE-unsaved2025411-2300-1027oqz.tra3\WebSocket\WebSocket.ino:13:
C:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\cores\esp8266/wl_definitions.h:76:3: note: previous declaration 'wl_tcp_state SYN_SENT'
76 | SYN_SENT = 2,
| ^~~~~~~~
In file included from c:\Users\aramp\Documents\Arduino\libraries\ESP_Async_WebServer\src/ESPAsyncWebServer.h:9,
from C:\Users\aramp\AppData\Local\Temp.arduinoIDE-unsaved2025411-2300-1027oqz.tra3\WebSocket\WebSocket.ino:20:
C:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2/tools/sdk/lwip2/include/lwip/tcpbase.h:60:17: error: 'SYN_RCVD' conflicts with a previous declaration
60 | SYN_RCVD = 3,
| ^
In file included from C:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\libraries\ESP8266WiFi\src/ESP8266WiFi.h:28,
from C:\Users\aramp\AppData\Local\Temp.arduinoIDE-unsaved2025411-2300-1027oqz.tra3\WebSocket\WebSocket.ino:13:
C:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\cores\esp8266/wl_definitions.h:77:3: note: previous declaration 'wl_tcp_state SYN_RCVD'
77 | SYN_RCVD = 3,
| ^~~~~~~~
In file included from c:\Users\aramp\Documents\Arduino\libraries\ESP_Async_WebServer\src/ESPAsyncWebServer.h:9,
from C:\Users\aramp\AppData\Local\Temp.arduinoIDE-unsaved2025411-2300-1027oqz.tra3\WebSocket\WebSocket.ino:20:
C:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2/tools/sdk/lwip2/include/lwip/tcpbase.h:61:17: error: 'ESTABLISHED' conflicts with a previous declaration
61 | ESTABLISHED = 4,
| ^
In file included from C:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\libraries\ESP8266WiFi\src/ESP8266WiFi.h:28,
from C:\Users\aramp\AppData\Local\Temp.arduinoIDE-unsaved2025411-2300-1027oqz.tra3\WebSocket\WebSocket.ino:13:
C:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\cores\esp8266/wl_definitions.h:78:3: note: previous declaration 'wl_tcp_state ESTABLISHED'
78 | ESTABLISHED = 4,
| ^~~~~~~~~~~
In file included from c:\Users\aramp\Documents\Arduino\libraries\ESP_Async_WebServer\src/ESPAsyncWebServer.h:9,
from C:\Users\aramp\AppData\Local\Temp.arduinoIDE-unsaved2025411-2300-1027oqz.tra3\WebSocket\WebSocket.ino:20:
C:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2/tools/sdk/lwip2/include/lwip/tcpbase.h:62:17: error: 'FIN_WAIT_1' conflicts with a previous declaration
62 | FIN_WAIT_1 = 5,
| ^
In file included from C:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\libraries\ESP8266WiFi\src/ESP8266WiFi.h:28,
from C:\Users\aramp\AppData\Local\Temp.arduinoIDE-unsaved2025411-2300-1027oqz.tra3\WebSocket\WebSocket.ino:13:
C:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\cores\esp8266/wl_definitions.h:79:3: note: previous declaration 'wl_tcp_state FIN_WAIT_1'
79 | FIN_WAIT_1 = 5,
| ^~~~~~~~~~
In file included from c:\Users\aramp\Documents\Arduino\libraries\ESP_Async_WebServer\src/ESPAsyncWebServer.h:9,
from C:\Users\aramp\AppData\Local\Temp.arduinoIDE-unsaved2025411-2300-1027oqz.tra3\WebSocket\WebSocket.ino:20:
C:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2/tools/sdk/lwip2/include/lwip/tcpbase.h:63:17: error: 'FIN_WAIT_2' conflicts with a previous declaration
63 | FIN_WAIT_2 = 6,
| ^
In file included from C:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\libraries\ESP8266WiFi\src/ESP8266WiFi.h:28,
from C:\Users\aramp\AppData\Local\Temp.arduinoIDE-unsaved2025411-2300-1027oqz.tra3\WebSocket\WebSocket.ino:13:
C:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\cores\esp8266/wl_definitions.h:80:3: note: previous declaration 'wl_tcp_state FIN_WAIT_2'
80 | FIN_WAIT_2 = 6,
| ^~~~~~~~~~
In file included from c:\Users\aramp\Documents\Arduino\libraries\ESP_Async_WebServer\src/ESPAsyncWebServer.h:9,
from C:\Users\aramp\AppData\Local\Temp.arduinoIDE-unsaved2025411-2300-1027oqz.tra3\WebSocket\WebSocket.ino:20:
C:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2/tools/sdk/lwip2/include/lwip/tcpbase.h:64:17: error: 'CLOSE_WAIT' conflicts with a previous declaration
64 | CLOSE_WAIT = 7,
| ^
In file included from C:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\libraries\ESP8266WiFi\src/ESP8266WiFi.h:28,
from C:\Users\aramp\AppData\Local\Temp.arduinoIDE-unsaved2025411-2300-1027oqz.tra3\WebSocket\WebSocket.ino:13:
C:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\cores\esp8266/wl_definitions.h:81:3: note: previous declaration 'wl_tcp_state CLOSE_WAIT'
81 | CLOSE_WAIT = 7,
| ^~~~~~~~~~
In file included from c:\Users\aramp\Documents\Arduino\libraries\ESP_Async_WebServer\src/ESPAsyncWebServer.h:9,
from C:\Users\aramp\AppData\Local\Temp.arduinoIDE-unsaved2025411-2300-1027oqz.tra3\WebSocket\WebSocket.ino:20:
C:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2/tools/sdk/lwip2/include/lwip/tcpbase.h:65:17: error: 'CLOSING' conflicts with a previous declaration
65 | CLOSING = 8,
| ^
In file included from C:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\libraries\ESP8266WiFi\src/ESP8266WiFi.h:28,
from C:\Users\aramp\AppData\Local\Temp.arduinoIDE-unsaved2025411-2300-1027oqz.tra3\WebSocket\WebSocket.ino:13:
C:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\cores\esp8266/wl_definitions.h:82:3: note: previous declaration 'wl_tcp_state CLOSING'
82 | CLOSING = 8,
| ^~~~~~~
In file included from c:\Users\aramp\Documents\Arduino\libraries\ESP_Async_WebServer\src/ESPAsyncWebServer.h:9,
from C:\Users\aramp\AppData\Local\Temp.arduinoIDE-unsaved2025411-2300-1027oqz.tra3\WebSocket\WebSocket.ino:20:
C:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2/tools/sdk/lwip2/include/lwip/tcpbase.h:66:17: error: 'LAST_ACK' conflicts with a previous declaration
66 | LAST_ACK = 9,
| ^
In file included from C:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\libraries\ESP8266WiFi\src/ESP8266WiFi.h:28,
from C:\Users\aramp\AppData\Local\Temp.arduinoIDE-unsaved2025411-2300-1027oqz.tra3\WebSocket\WebSocket.ino:13:
C:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\cores\esp8266/wl_definitions.h:83:3: note: previous declaration 'wl_tcp_state LAST_ACK'
83 | LAST_ACK = 9,
| ^~~~~~~~
In file included from c:\Users\aramp\Documents\Arduino\libraries\ESP_Async_WebServer\src/ESPAsyncWebServer.h:9,
from C:\Users\aramp\AppData\Local\Temp.arduinoIDE-unsaved2025411-2300-1027oqz.tra3\WebSocket\WebSocket.ino:20:
C:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2/tools/sdk/lwip2/include/lwip/tcpbase.h:67:17: error: 'TIME_WAIT' conflicts with a previous declaration
67 | TIME_WAIT = 10
| ^~
In file included from C:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\libraries\ESP8266WiFi\src/ESP8266WiFi.h:28,
from C:\Users\aramp\AppData\Local\Temp.arduinoIDE-unsaved2025411-2300-1027oqz.tra3\WebSocket\WebSocket.ino:13:
C:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\cores\esp8266/wl_definitions.h:84:3: note: previous declaration 'wl_tcp_state TIME_WAIT'
84 | TIME_WAIT = 10
| ^~~~~~~~~
Using library ESP8266WiFi at version 1.0 in folder: C:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\libraries\ESP8266WiFi
Using library ESPAsyncTCP at version 1.2.4 in folder: C:\Users\aramp\Documents\Arduino\libraries\ESPAsyncTCP
Using library ESP Async WebServer at version 3.7.7 in folder: C:\Users\aramp\Documents\Arduino\libraries\ESP_Async_WebServer
Using library Hash at version 1.0 in folder: C:\Users\aramp\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\libraries\Hash
exit status 1
Compilation error: exit status 1`
I can compile the program by removing or commenting out lines 9 - 18 (it appears that similar lines are already in ESPAsyncWebServer.h, lines 18 - 31).
Stack Trace
Not applicable.
Minimal Reproductible Example (MRE)
Open up the WebSockets example.
I confirm that: