Hello @marcin
Is the ESP8266 you mentioned in this post connected through our MQTT/“Bring Your Own Thing” API already?
If not, I’d like to recommend you try following this tutorial I just wrote up on how to convert your sketch file from our Cayenne Arduino Library to Cayenne Arduino MQTT.
We believe this MQTT connectivity is more stable and fault-tolerant than our original Arduino connectivity and would be interested to hear if you see that as well. Please feel free to contact me if you have any questions or need assistance with converting your code following the steps in that post!