error 4

[bbartling]

Is it possible to publish only....for example:

mqtt.subscribe("home/mytopic")

then I am trying this below to publish people count and a cameras frames per second to the pub sub:

pub_string = f"home/people/{people}/fps/{current_fps}"
print("PUBLISH TO MQTT BUS: ", pub_string)
mqtt.publish(pub_string)

And I get this error 4, sorry not not an MQTT expert so any tips appreciated:

Error 4 subscribing to topic: home/mytopic
PUBLISH TO MQTT BUS:  home/people/0/fps/33.3363
Error 4 publishing topic home/people/0/fps/33.3363
PUBLISH TO MQTT BUS:  home/people/1/fps/29.8179
Error 4 publishing topic home/people/1/fps/29.8179

[Sohaib90]

Error 4 is usually a Connection Refused: Bad username or password

you can also have a look here for error codes:
https://www.vtscada.com/help/Content/D_Tags/D_MQTT_ErrMsg.html

So I think you might have to check when your client makes a connection to the broker. Usually it can also be that the broker requires tls/ssl encryption and it is not provided