AWS embedded C SDK - Cannot connect

Question

Hi,  
  
I have an ESP32 board which connects successfully to AWS IoT, publish messages and receives messages from subscribed topics, using Amazon certificates.  
  
I cannot connect using AWS embedded C SDK using same certificates. Any connect using certificates end up this way:  
  
\[INFO] \[DEMO] \[mqtt_demo_mutual_auth.c:584] Establishing a TLS session to XXXXXXXXXXXXXXXXX.iot.eu-west-1.amazonaws.com:8883.  
\[INFO] \[DEMO] \[mqtt_demo_mutual_auth.c:1264] Creating an MQTT connection to XXXXXXXXXXXXXXXXX.iot.eu-west-1.amazonaws.com.  
\[ERROR] \[Transport_OpenSSL_Sockets] \[openssl_posix.c:696] Failed to receive data over network: SSL_read failed: ErrorStatus=EVP lib.  
..................... (huge numbers of lines like one above)........................................................................................................................................  
\[ERROR] \[Transport_OpenSSL_Sockets] \[openssl_posix.c:696] Failed to receive data over network: SSL_read failed: ErrorStatus=EVP lib.  
\[ERROR] \[Transport_OpenSSL_Sockets] \[openssl_posix.c:696] Failed to receive data over network: SSL_read failed: ErrorStatus=EVP lib.  
\[ERROR] \[MQTT] \[core_mqtt.c:1531] CONNACK recv failed with status = MQTTNoDataAvailable.  
\[ERROR] \[MQTT] \[core_mqtt.c:1802] MQTT connection failed with status = MQTTNoDataAvailable.  
\[ERROR] \[SHADOW_DEMO] \[shadow_demo_helpers.c:604] Connection with MQTT broker failed with status 7.  
\[ERROR] \[SHADOW] \[shadow_demo_main.c:528] Failed to connect to MQTT broker.  
  
Any help is appreciated.  
  
Regards,  
Pavel

Answer

Thanks Pavel,   
  
I've just had exactly the same problem and as soon as I attached the policy to the certificate it worked.  
  
Carl

Answer

Hi,  
  
The long stack with thousands of messages like "Failed to receive data over network: SSL_read failed: ErrorStatus=EVP lib." is caused by any inconsistency in AWS IoT Policy. Once it is fixed everything is working fine.  
  
Regards,  
Pavel

AWS embedded C SDK - Cannot connect

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