typedef bool (*utcp_pre_accept_t)(struct utcp *utcp, uint16_t port);
typedef void (*utcp_accept_t)(struct utcp_connection *utcp_connection, uint16_t port);
typedef bool (*utcp_pre_accept_t)(struct utcp *utcp, uint16_t port);
typedef void (*utcp_accept_t)(struct utcp_connection *utcp_connection, uint16_t port);