IOTcomms MQTT over QUIC implementation vs MQTT over TCP only tcp implementation works for now how to use using tcp 1. download mosquitto broker from https://mosquitto.org/download/ for the next steps, I use three different command line consoles on the same computer 2. run the mosquitto broker on the default port by using the command mosquitto -v 3. run subscriber_tcp.py 4. run publisher_tcp.py You should receive the "Hello world!" message published to the subscriber by the publisher