Connection Failure: RPI Pico W to HiveMQ Cloud

HiveMQ Cloud
1

Newbie trying to connect RPI Pico W using module mqtt_as to HiveMQ Cloud.

Using Port 8883 gives error code -1 ‘Connection closed by host’ (Instant error)
Using Port 1883 gives error code -1 ‘Timeout on socket read’ (After a delay)

Any guidance on how to resolve the connection issue would be welcome.
Thanks.

PS The Pico connects to my wifi OK.

2

Does your code work to connect to other brokers such as test.mosquitto.org or mqtt.eclipseprojects.io on port 1883?

3

Thank you for your response. Code works perfectly with the public brokers ‘mqtt.eclipseprojects.io’, ‘broker.hivemq.com’, ‘test.mosquitto.org’ on port 1883.

4

Hi @karl60 ,

Nice to see your interest in MQTT and HiveMQ Cloud, please welcome to our community :wave:

Using port 1883 on HiveMQ Cloud doesn’t make any sense, there are only following ports available:

Port (TLS): 8883
Port (Websocket + TLS): 8884

To connect to 8883 you need:

  • hostname of your cluster;
  • username and password from the clusters MQTT Credentials;
  • HiveMQ Cloud requires the TLS-SNI extension to be available and used, please refer here and check if it is available in your system.
  • some devices require the root certificate. You can download the root certificate here.

I hope this helps,
Kind regards,
Dasha from HiveMQ