ESP8266 MQTTClient poll check. or wait.msg

[Fisherman48]

Hi
Using ESP8266-12 and
from umqtt.robust import MQTTClient
From what I understand I have to explicit poll in a loop, for message, using client.check_msg() or client.wait_msg()
Are there any other implicit like background/ interrupt driven mechanism to activate the callnack: client.set_callback(sub_cb) ?

For ex for RasberryPye there are a mechanism for that:
import paho.mqtt.client as mqtt #import the client
client.loop_start()

Br /Stefan in the archipellago of Stockholm

[cwalther]

Are there any other implicit like background/ interrupt driven mechanism to activate the callnack

No, not with umqtt.

You may be interested in a more sophisticated asynchronous MQTT client: https://github.com/peterhinch/micropython-mqtt/blob/master/mqtt_as/README.md

[Fisherman48]

Thanks,
so, to stay on ESP8266 with limited memory I have to freeze the mqtt_as, or move to esp32.
Br /Stefan

[glenn20]

I haven't tried it personally, but you could try invoking client.check_msg() from a Timer callback if you are happy with the latency. I'm also not sure if there are restrictions on what code can be executed from a callback on esp8266.