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Tested under ESP32S3, running 50 tasks, each with a client, and a server listening to one client, totalizing 150 sockets/files open, forwarding data from PPP to Ethernet and vice versa. Reasoning for 255 total sockets/files is VFS local_fd_t being a uint8_t. Since FD_SETSIZE is defined at tool level, a CMakeLists user definition is needed in cases above 64 (the default value). Merges https://github.com/espressif/esp-idf/pull/13866