Errors on compile in a PlatformIO project

[Nailcoding]

While using this library with teensy 4.1 and the MultiChatClient example works fine, using it in a platform IO project shows problems when compiling. The first error is: .pio\libdeps\teensy41\QNEthernet\src/lwipopts.h:179:36: error: expected identifier before numeric constant

define TCP_MSS 1460

Renaming this macro and compiling again shows the same error in a different file as there also is a macro with this name:

.pio\libdeps\teensy41\QNEthernet\src/lwip/opt.h:1293:41: error: expected identifier before numeric constant

define TCP_MSS 536

There are also some other errors like this one: ..\Firmware\PlatformIOScripts\packages\framework-arduinoteensy\libraries\FNET\src/stack/fnet_socket.h:631:1: error: expected declaration before '}' token

The part of fnet_socket.h at line 631 doesn't seem to have an error:

IPV6_JOIN_GROUP,        /**< @brief (RFC3493) Join a multicast group on a specified local interface.@n
                        *  It is valid only for the SOCK_DGRAM (UDP) sockets.*/
IPV6_LEAVE_GROUP        /**< @brief (RFC3493)  Leave a multicast group on a specified interface.@n
                        *  It is valid only for the SOCK_DGRAM (UDP) sockets.*/

this is line 631: } fnet_socket_options_t;

My platformio.ini: [platformio] description = RCM default_envs = teensy41 core_dir = ..\PlatformIOScripts

[env:teensy41] platform = teensy board = teensy41 framework = arduino lib_deps = ssilverman/QNEthernet@^0.18.0

[Nailcoding]

Seems it just interfered with another library (DHCP) that was included.

[ssilverman]

I'm glad you got it sorted out. Yes, FNET is referenced by the NativeEthernet library, but isn't used by QNEthernet. QNEthernet uses lwIP under the covers, and that's included with the library.

Note that QNEthernet includes a DHCP client. (See Ethernet.begin() and associated examples for both blocking and non-blocking approaches.) Do you, by any chance, need to serve DHCP?