I'm running a https server via altcp_tls_mbedtls I'm new to this too so not sure how can I debug it for you... but.. I guess it is working for me, also, I found on alttcp_tls_mbedtls.c function altcp_tls_create_config
if (TCP_WND < MBEDTLS_SSL_MAX_CONTENT_LEN) { LWIP_DEBUGF(ALTCP_MBEDTLS_DEBUG|LWIP_DBG_LEVEL_SERIOUS, ("altcp_tls: TCP_WND is smaller than the RX decrypion buffer, connection RX might stall!\n")); } so I made the TCP_WND greater than the max content len of TLS. I guess in that case it sure is receiving data volumes that are larger than TCP_WND. @Simon: would be possible to turn that run time if in to a pre-compiler check? Mario Luzeiro ________________________________________ From: lwip-users <lwip-users-bounces+mrluzeiro=ua...@nongnu.org> on behalf of tomek wilkxt <wil...@gmail.com> Sent: 25 October 2019 07:22 To: Mailing list for lwIP users Subject: Re: [lwip-users] https post_auto_wnd not work Did anyone have a problem or could check how the https(mbedtls) server works when receiving data volumes larger than TCP_WND? _______________________________________________ lwip-users mailing list lwip-users@nongnu.org https://lists.nongnu.org/mailman/listinfo/lwip-users