Add refresh param in config file

Put functions def in separate file "main_lib"

code/lib/main_lib.py

@@ -0,0 +1,40 @@
+"""Divers fonctions utiles
+"""
+
+import time
+import machine
+import network
+from umqtt.robust import MQTTClient
+
+
+def WifiConnect(ssid, psk):
+    """Connect to the wifi with given credentials"""
+    wlan = network.WLAN(network.STA_IF)
+    wlan.active(True)
+    nets = wlan.scan()
+    for net in nets:
+        net_ssid = net[0].decode()
+        if net_ssid == ssid:
+            print('Network found!')
+            wlan.connect(net_ssid, psk)
+            while not wlan.isconnected():
+                machine.idle()  # save power while waiting
+            print('WLAN connection succeeded!')
+            break
+    if not wlan.isconnected():
+        print("WLAN not found/not connected")
+
+    return wlan
+
+def now(rtc):
+    """Return a string representing date/time now"""
+    return "{0:04d}/{1:02d}/{2:02d}_{4:02d}:{5:02d}:{6:02d}".format(*rtc.datetime())
+
+
+def MqttPublish(client, topic, message, retain=False, qos=0, sleep=10):
+    """MQTT publish helper"""
+    client.publish("test/{device}/{topic}".format(device=client.client_id, topic=topic),
+                   message,
+                   retain=retain,
+                   qos=qos)
+    time.sleep_ms(sleep)