Hi While working with integrating cloud on embedded platform i’ m using Mbed TLS , While performing handshake its able to exchange hello, but when it tries to do SERVER_CHANGE_CIPHER_SPEC it block on ssl->f_recv function and does nothing. These are my logs i have added function lines in log for ba…

Hi @rutvijtrivedi001 Without knowing exactly what Mbed TLS version you are using, the line numbers don’t mean much. However, as you stated, it gets blocked within the f_recv callback function. You should check your networking stack, to identify root cause for your recv callback being blocked. Y…

My current mbed TLS version is 2.4.0.

@rutvijtrivedi001 Thank you for your information. However, The line numbers inyour log do not correspond to Mbed TLS 2.4.0 mbedtls_ssl_fetch_input() inthis version is from line 2203 to line 2406 In addition, I suggest you update your version to one of the LTS versions, such as Mbed TLS 2.7.x No…

Hi thank you for the reply. I will defiantly dig into network stack. But can config.h help here ?

HI, Since the issue is probably in your network stack, I doubt config.h will help. The only thing that might be causing this from Mbed TLS side that I could think of, is memory used is too bug \ small, and you get memory issues. Have you read this article ? Have you configured MBEDTLS_SSL_MAX_CO…

Hi, I migrated my mbedTLS to higher version and MBEDTLS_SSL_MAX_CONTENT_LEN is (1024 * 16), even tried with changing to 4k(1024 * 4) but still behavior is the same in all the cases.

In this case, it’s most likely your network stack, or concurrency problem. Are you working on a multithreaded environment? Have you enabled MBEDTLS_THREADING_C? Have you ported the mutex according to your platform?

Hi , Here are the logs after migration of mbedTLS. => handshake client state: 0 => flush output <= flush output client state: 1 => flush output <= flush output => write client hello client hello, max version: [3:3] client hello, current time: 1530773308 client hello, session id len.: 0 …

Thanks, Have you added debug logs inside your recv callback function to understand exactly where it hangs?

Receive gets blocks at while intigrating cloud on client state:12

Mbed TLS

rutvijtrivedi001 (rutvij trivedi) July 5, 2018, 9:15am 9

HI,
I m using freeRTOS based environment, but there is only one thread running and yes MBEDTLS_THREADING_C is enabled.

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Receive gets blocks at while intigrating cloud on client state:12

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