UMQTT - mqtt stops publishing after 5 minutes

[TanCans]

Hello everyone,

i am using umqtt library to publish some telemetry data to an IoT platform with a pycom microcontroller. But mqtt stops publishing data exact after five minutes even though it is still connected to wlan.

I am sharing the piece of code that calls mqtt client and the library

Connecting wlan:

wlan.connect('my wlan', auth=(None,'my password'), timeout= 50000) #even though i changed this timeout it didnt solve my problem

My credentials (for iot platform)

server = 'my server'
port = 1883
id = 'my id'
pw = ‘acces token’
topic_publish = 'v1/devices/me/telemetry'
dict={}

Creating a client:

Client = MQTTClient(id, server, port, pw, pw)
time.sleep(2)
client.connect()

Publishing in the loop:

While 1
encoded=ujson.dumps(dict)
client.publish(topic_publish, encoded)
time.sleep(1)

Umqtt library:

umqtt.txt

Thank you all in advance!