MQTT with TLS DevZone (l4_e2) fails to build – Nordic Q&A – Nordic DevZone

I get a bunch of errors like undefined reference to `mbedtls_ssl_free’, `mbedtls_ssl_get_bytes_avail’,`mbedtls_ssl_config_free’, ‘mbedtls_ssl_read’

 `mbedtls_ssl_set_bio’ and `mbedtls_ssl_handshake’`mbedtls_ssl_get_bytes_avail’

I compare my solution to the given solution and neither build, although the solution was missing a few small configs added in the newer version of the course. 

Exercise 2 – Nordic Developer Academy

thanks for your help, this is my first time.