[riot-notifications] [RIOT-OS/RIOT] TCP lwIP Error Connecting Sock Problem (#11910)

Gunar Schorcht notifications at github.com
Fri Jul 26 12:37:23 CEST 2019

> By the way these are the warnings when i compile the program
> ```
> /data/riotbuild/RIOT-master/examples/tcp-simple-server/bin/esp32-wroom-32/lwip_api.a(tcpip.o): In function `tcpip_try_callback':
> tcpip.c:(.text+0x32c): warning: undefined reference to `sys_mbox_trypost_fromisr'
> /data/riotbuild/RIOT-master/examples/tcp-simple-server/bin/esp32-wroom-32/lwip_api.a(tcpip.o): In function `tcpip_send_msg_wait_sem':
> tcpip.c:(.text+0x35e): warning: undefined reference to `sys_mbox_trypost_fromisr
> ```

BTW, I was trying investige these undefined symbols a year ago, but I don't remeber what the problem was.

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