1# Plain MQTT protocol 2listener 1883 3 4# MQTT over TLS 1.1 5listener 8883 6tls_version tlsv1.1 7cafile /tls/ca_certificate.pem 8certfile /tls/server_certificate.pem 9keyfile /tls/server_key.pem 10 11# MQTT over TLS 1.2 12listener 8884 13tls_version tlsv1.2 14cafile /tls/ca_certificate.pem 15certfile /tls/server_certificate.pem 16keyfile /tls/server_key.pem 17 18# TODO(This does not appear to be supported on Ubuntu 18.04. Re-try on 20.04 or next LTS release) 19# MQTT over TLS 1.3 20# 21# listener 8885 22# tls_version tlsv1.3 23# cafile /tls/ca_certificate.pem 24# certfile /tls/server_certificate.pem 25# keyfile /tls/server_key.pem 26 27log_dest syslog 28 29log_type error 30log_type warning 31log_type notice 32log_type information 33log_type debug 34 35connection_messages true 36