[mbed-tls] mbedtls_ssl_set_bio hangs

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