MicroPython Forum (Archive)

Posted: **Thu Aug 18, 2022 8:02 pm**

Newbie trying to understand MQTT

Situation: With a HiveMQ Cloud broker I can simultaneously pub/sub using:

* Mosquitto command line
* Standard Python (on laptop) using HiveMQ code examples
* Windows MQTT Explorer app

So I'm happy the HiveMQ Broker side of things is working OK.

But I can't get a Pico W with MQTT_AS connected to the HiveMQ Broker

I've added the following to the MQTT_AS config.py file and obviously populated secrets.py accordingly:

Code: Select all

config['server'] = secrets['hivemq_broker']
config['port'] = secrets['port']
config['user'] = secrets['hivemq_username']
config['password'] = secrets['hivemq_key']

With port set to 8883 I get the following error (I'm using the mqtt_as code example range.py as a basis):

Code: Select all

Checking WiFi integrity.
Got reliable connection
Connecting to broker.
Connection failed. Error: (-1, 'Connection closed by host')

I would appreciate a push in the right direction to solving this problem.
Thanks

Posted: **Mon Aug 22, 2022 2:23 pm**

So I'm happy the HiveMQ Broker side of things is working OK.

But I can't get a Pico W with MQTT_AS connected to the HiveMQ Broker

Maybe print the config just in case something is not ok.

What is your source code ? Giving the config won't tell us if your code is OK!
Do you have the micropython reference code url?

If you have a Raspberry Pi or a linux server, try a local mosquitto broker first. Then when it is working you could try the internet broker.

Posted: **Mon Aug 22, 2022 4:51 pm**

If you're using TLS (as implied by 8883) you need to set config['ssl'] = True. Please study the various tls examples.

The suggestion of developing code with a local mosquitto broker is a good one. Getting TLS working can be tricky and it's good to know that your code is solid before you attempt it.

Posted: **Thu Sep 15, 2022 10:12 am**

Im having the same problem so I wish to get some help.

Just few questions:
How should I get ssl work? Do i have to have any certificate file? Why do I not need when I using other client app.(they only need to "tick" on option "using SSL"). If so, where should I get whatever certificate file and where do I need to place it onto the device? How do I put it onto device, as it does not connect as flash drive?

Many thanks.

Posted: **Sat Oct 08, 2022 9:46 am**

worked out solution.

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client = MQTTClient(secrets.client_id, secrets.mqtt_server, port=secrets.mqtt_port, user=secrets.mqtt_username, password=secrets.mqtt_psd, ssl=True, ssl_params={
        "server_hostname": secrets.mqtt_server})

especially:

Code: Select all

ssl=True, ssl_params={
        "server_hostname": secrets.mqtt_server}

MicroPython Forum (Archive)

Pico w mqtt_as to HiveMQ Cloud

Pico w mqtt_as to HiveMQ Cloud

Re: Pico w mqtt_as to HiveMQ Cloud

Re: Pico w mqtt_as to HiveMQ Cloud

Re: Pico w mqtt_as to HiveMQ Cloud

Re: Pico w mqtt_as to HiveMQ Cloud