-- Gilles Peskine Mbed TLS developer On 08/06/2021 02:30, Ron Eggler via mbed-tls wrote: > > On 2021-06-07 5:00 p.m., Ron Eggler via mbed-tls wrote: >> Hi, >> >> >> i'm in the process of wrioting an FTPS client for a system running on >> uCOS. >> >> I've been able to setup the control channel fine and working on >> setting up the data channel for a simple list command execution. >> >> It seems like I seem able to setup everything fine but the call to >> mbedtls_ssl_set_bio() hangs even though I set it to execute the >> timeout function like: >> >> mbedtls_ssl_set_bio( &ssl_d, >>           &data_fd, >>           mbedtls_tls_send, >>           NULL, >>           mbedtls_tls_recv_timeout); >> >> Where the mbed_tls_recv_timeout looks like: >> >> https://pastebin.com/Jw3iLc0x >> >> The current connection uses ipv4, i.e. the select () branch is >> active. I never see the timed out message. Any idea what may be going >> on here? >> >> Thank you, >> >> Ron >> > A bit more detail: as for what comes before the mbedtls_ssl_set_bio() > call: > >     ret = mbedtls_ssl_config_defaults(&conf_d, >                       MBEDTLS_SSL_IS_CLIENT, >                       MBEDTLS_SSL_TRANSPORT_STREAM, >                       MBEDTLS_SSL_PRESET_DEFAULT); > >     mbedtls_ssl_conf_authmode( &conf_d, MBEDTLS_SSL_VERIFY_OPTIONAL); >     mbedtls_ssl_conf_ca_chain( &conf_d, &cacert_d, NULL ); >     mbedtls_ssl_conf_rng(&conf_d, mbedtls_ctr_drbg_random, &ctr_drbg_d ); >     mbedtls_ssl_conf_dbg(&conf_d, mydebug, stdout); >     ret = mbedtls_ssl_conf_own_cert( &conf_d, &clicert_d, &pkey_d); > >     ret = mbedtls_ssl_setup( &ssl_d, &conf_d ); > >     mbedtls_ssl_set_bio( &ssl_d, >           &data_fd, >           mbedtls_tls_send, >           NULL, >           mbedtls_tls_recv_timeout); >