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0 is a valid socket description, so should be accepted after we create a socket. In IDF, though, it's just a theoretical issue, as customers have to configure: * FD_SETSIZE = CONFIG_LWIP_MAX_SOCKETS (from makefiles) * CONFIG_VFS_SUPPORT_IO = n (from menuconfig) (this configuration is currently broken, but if we adjust the IDF here and there we could reproduce the issue)