Hi.
Yes.
We also have our ESP-NOW getting started guide with MicroPython: https://randomnerdtutorials.com/micropython-esp-now-esp32/
We already have more tutorials planned about this subject.
Regards,
Sara

If what you need is a two way com between two ESP32, you may also consider using the ESPNow protocol… please refer to the doc
docs.micropython.org/en/latest/library/espnow.html#module-espnow

Hi Sara, yesterday after some time reviewing it I found the missing piece:
MQTT_SSL = True # set to False if using local Mosquitto MQTT broker
I had understood “local” as being in the same machine, so I had this as True. Changed to False and it worked.

This was in here:
https://randomnerdtutorials.com/raspberry-pi-pico-w-mqtt-micropython/#:~:text=the%20umqtt%20folder.-,Publishing%20MQTT%20Messages,-In%20this%20example

Thank you !

Hi.
I mean that you need to check if you’ve allowed the broker to receiver packets from other devices (you can do it with or without authentication). It’s explained in this section: https://randomnerdtutorials.com/how-to-install-mosquitto-broker-on-raspberry-pi/#mosquitto-no-authentication
Regards,
Sara

Hi Sara, I have the same issue. Following your tutorials and get same error. I am using authentication and if I use two terminal windows in the main pi i get communication and no error.
When you mention “check if you allowed remote access to the broker” what do you mean exactly?

Hi.
What exactly is not working?
You need to be more specific.
Regards,
Sara

client_id = ubinascii.hexlify(machine.unique_id())

mqttClient =MQTTClient(
client_id=client_id,
server=”host goes here”,
port=12104,
user=”default”,
password= “password goes here”

)


topic_sub = b’notification’
topic_pub = b’hello’

def on_message_received(topic, msg):
print((topic, msg))

mqttClient.set_callback(on_message_received)
print(“trying connect”)
try:
mqttClient.connect()
client.subscribe(topic_sub)
print(“Connected with robust client!”)
except Exception as e:
print(“Connection failed:”, e)

Thanks for the tip.
Regards,
Sara

I know this is old but I had this issue too. Here’s the fix: set keepalive to a nonzero number in the constructor in umqttsimple.py.

def init(self, client_id, server, port=0, user=None, password=None, keepalive=1 <<– THIS

github.com/micropython/micropython-lib/issues/466

Like this: client = MQTTClient( [..other parameters..] , keepalive=60)