Remove ssid/key from example script.
import time, network
from mqtt import MQTTClient
-SSID='mux' # Network SSID
-KEY='j806fVnT7tObdCYE' # Network key
+SSID='' # Network SSID
+KEY='' # Network key
# Init wlan module and connect to network
print("Trying to connect... (may take a while)...")
