Websockets and libmosquitto 2.0.15

[peter-winter]

Is there a way to make a client based on libmosquitto to connect to a broker running over websockets?
I confirm that mqtt-explorer works just fine with the broker, however both mosquitto_sub, mosquitto_pub (and also my own client built with libmosquitto) won't connect.

They all fail with the same error:
Error: A network protocol error occurred when communicating with the broker.

Is there something in C API that I'm missing?

[richardash1981]

The last comment on #1540 says that websocket support is available in the client in the "develop" branch in Git, but not in the 2.0.x release series ("develop" is targeted to become 2.1.x).