Releasing the client port after the client has disconnected from the broker

[Kewal]

I am using an apollo broker and libmosquitto C client library to connect to the broker.After connecting and successfully publishing the message to the broker, i disconnect the client from the broker but the port that the client uses to connect to the broker is still not freed. Is there any way to manually free that port?

[Gianfranco Costamagna (costamagnagianfranco)]

did you try to see if the process was still alive? AFAIK ports are freed when the main pid exits

[Roger Light (roger.light)]

Calling mosquitto_disconnect() doesn't immediately disconnect the client, it sends the DISCONNECT packet and once that packet is sent, it then closes the socket. You can wait until the on_disconnect() callback is triggered to make sure this has happened. Alternatively, calling mosquitto_destroy() will close the socket.

It is worth noting that sockets remain in the CLOSE_WAIT state for a reasonable amount of time, so the socket may not appear to have been released in e.g. netstat.

[Launchpad Janitor (janitor)]

[Expired for mosquitto (Ubuntu) because there has been no activity for 60 days.]