Unable to connect openssl_publisher example to HiveMQ about mqtt-c

[mpfj]

So I've now added some extra debug and the CONNACK reply is coming back as:-

20 02 00 05

The reason code is [0x05 Connection Refused, not authorized] which is very confusing as the mosquitto test uses the same username & password but that works !!

Interestingly I don't get reason code 0x04 "Connection Refused, bad user name or password" so I'm guessing the login is correct.
Does that point to a certificate issue ?

[mpfj]

Finally worked it out from this link

HiveMQ requires the TLS SNI extension to be used so before BIO_do_connect(), I added the following:-

res = SSL_set_tlsext_host_name(ssl, szHost);
if(res != 1)
	return FALSE;

Hope that helps someone else!!