error: MQTT read error about iotkit-embedded HOT 4 CLOSED

Do u have ported the ssl /tcp HAL API on your platform?
The iotkit uses mbedtls only as an example for tls/dtls in linux x86 platform, you should use your ssl lib or porting the mbedtls and realize the HAL API.

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src/import/linux/include/mbedtls/ssl.h
#define MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY -0x7880

I saw code = -30848 which means -0x7880, so looks to me in this case SSL connection was closed and SDK you ported had to disconnect MQTT session

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@tongjiang @edwardyangx , thanks,

I added a small delay after mbedtls_ssl_readutils in the _network_ssl_read, and it works good, so I guess it start return without get the packages.

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@WeldonWangwang That's a valuable feedback, which proved again HAL_TLS_mbed.c on different platforms all need corresponding adjustment or even re-implentation.

Well done. I will close this issue then.

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