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);