An invalid SSL record was received

[Vincent zhang]

I used ssl/tls to connect the mqtt server, which almost worked well, but when i started to downloading firmware about 2 MB in size，
I received SSL error -0x7200(MBEDTLS_ERR_SSL_INVALID_RECORD).
I investigated many similar issues，and most of them said that MBEDTLS_ SSL_ MAX_ CONTENT_ LEN should be setted more large. I had check the configuration of mbedtls,and maked sure that MBEDTLS_ SSL_ MAX_ CONTENT_ LEN was largest,but it still not worked.
Can someone give some advices？