After upgrading to the lastest version, I had to install mosquitto because the embedded broker is now deprecated. Mosquitto is running, I restart HA and this is the mqtt section:
mqtt:
broker: 127.0.0.1
port: 1883
username: !secret mqtt_username
password: !secret mqtt_password
but in the log it seems it still tries to use the embedded one (hbmqtt):
# cat home-assistant.log | grep mqtt
2019-11-02 18:20:28 INFO (SyncWorker_12) [homeassistant.util.package] Attempting install of hbmqtt==0.9.5
2019-11-02 18:20:28 INFO (SyncWorker_16) [homeassistant.loader] Loaded manual_mqtt from homeassistant.components.manual_mqtt
2019-11-02 18:20:37 ERROR (SyncWorker_12) [homeassistant.util.package] Unable to install package hbmqtt==0.9.5: Failed building wheel for docopt
2019-11-02 18:20:37 ERROR (MainThread) [homeassistant.config] Platform error: binary_sensor - Requirements for mqtt not found: ['hbmqtt==0.9.5'].
2019-11-02 18:20:48 INFO (SyncWorker_6) [homeassistant.util.package] Attempting install of hbmqtt==0.9.5
2019-11-02 18:20:57 ERROR (SyncWorker_6) [homeassistant.util.package] Unable to install package hbmqtt==0.9.5: Failed building wheel for docopt
2019-11-02 18:20:57 ERROR (MainThread) [homeassistant.config] Platform error: sensor - Requirements for mqtt not found: ['hbmqtt==0.9.5'].
2019-11-02 18:20:57 INFO (SyncWorker_2) [homeassistant.util.package] Attempting install of hbmqtt==0.9.5
2019-11-02 18:21:06 ERROR (SyncWorker_2) [homeassistant.util.package] Unable to install package hbmqtt==0.9.5: Failed building wheel for docopt
2019-11-02 18:21:06 ERROR (MainThread) [homeassistant.setup] Setup failed for mqtt: Requirements for mqtt not found: ['hbmqtt==0.9.5'].
2019-11-02 18:21:06 INFO (SyncWorker_9) [homeassistant.util.package] Attempting install of hbmqtt==0.9.5
2019-11-02 18:21:15 ERROR (SyncWorker_9) [homeassistant.util.package] Unable to install package hbmqtt==0.9.5: Failed building wheel for docopt
2019-11-02 18:21:15 ERROR (MainThread) [homeassistant.config] Platform error: alarm_control_panel - Requirements for mqtt not found: ['hbmqtt==0.9.5'].
2019-11-02 18:21:15 INFO (SyncWorker_8) [homeassistant.util.package] Attempting install of hbmqtt==0.9.5
...
Is there something else to change?