examples: Update examples.

* Update examples to import device ID and secret key from secrets.py.

Author: iabdalkader

README.md

@@ -4,6 +4,9 @@ This is a Python client for the Arduino IoT cloud, which runs on both CPython an
 ## Minimal Example
 The following basic example shows how to connect to the Arduino IoT cloud using basic username and password authentication, and control an LED from a dashboard's switch widget.
 ```python
+from secrets import DEVICE_ID
+from secrets import SECRET_KEY
+
 # Switch callback, toggles the LED.
 def on_switch_changed(client, value):
     # Note the client object passed to this function can be used to access
@@ -14,7 +17,7 @@ def on_switch_changed(client, value):
 # 1. Create a client object, which is used to connect to the IoT cloud and link local
 # objects to cloud objects. Note a username and password can be used for basic authentication
 # on both CPython and MicroPython. For more advanced authentication methods, please see the examples.
-client = ArduinoCloudClient(device_id=b"DEVICE_ID", username=b"DEVICE_ID", password=b"SECRET_KEY")
+client = ArduinoCloudClient(device_id=DEVICE_ID, username=DEVICE_ID, password=SECRET_KEY)
 
 # 2. Register cloud objects.
 # Note: The following objects must be created first in the dashboard and linked to the device.
@@ -29,6 +32,15 @@ client.register("led", value=None)
 client.start()
 ```
 
+Your `secrets.py` file should look like this:
+
+```python
+WIFI_SSID  = ""  # WiFi network SSID (for MicroPython)
+WIFI_PASS  = ""  # WiFi network key  (for MicroPython)
+DEVICE_ID  = b"" # Provided by Arduino cloud when creating a device.
+SECRET_KEY = b"" # Provided by Arduino cloud when creating a device.
+```
+
 For more detailed examples and advanced API features, please see the [examples](https://github.com/arduino/arduino-iot-cloud-py/tree/main/examples).
 
 ## Testing on CPython/Linux

examples/example.py

@@ -13,10 +13,12 @@
 import argparse
 import arduino_iot_cloud.ussl as ssl
 
+from secrets import DEVICE_ID
+from secrets import SECRET_KEY
+
 KEY_PATH = "pkcs11:token=arduino"
 CERT_PATH = "pkcs11:token=arduino"
 CA_PATH = "ca-root.pem"
-DEVICE_ID = b"fcbb21b8-b5b8-4961-a89f-a3f1abda7957"
 
 
 def on_switch_changed(client, value):
@@ -59,7 +61,7 @@ def user_task(client):
     # To use a secure element, set the token's "pin" and URI in "keyfile" and "certfile", and
     # the CA certificate (if any) in "ssl_params". Alternatively, a username and password can
     # be used to authenticate, for example:
-    #   client = ArduinoCloudClient(device_id=b"DEVICE_ID", username=b"DEVICE_ID", password=b"SECRET_KEY")
+    #   client = ArduinoCloudClient(device_id=DEVICE_ID, username=DEVICE_ID, password=SECRET_KEY)
     client = ArduinoCloudClient(
         device_id=DEVICE_ID,
         ssl_params={

examples/micropython.py

@@ -15,10 +15,11 @@
 from random import uniform
 from secrets import WIFI_SSID
 from secrets import WIFI_PASS
+from secrets import DEVICE_ID
+from secrets import SECRET_KEY
 
 KEY_PATH = "key.der"
 CERT_PATH = "cert.der"
-DEVICE_ID = b"fcbb21b8-b5b8-4961-a89f-a3f1abda7957"
 
 
 def on_switch_changed(client, value):
@@ -68,7 +69,7 @@ def wifi_connect():
     # Create a client object to connect to the Arduino IoT cloud.
     # For MicroPython, the key and cert files must be stored in DER format on the filesystem.
     # Alternatively, a username and password can be used to authenticate:
-    #   client = ArduinoCloudClient(device_id=b"DEVICE_ID", username=b"DEVICE_ID", password=b"SECRET_KEY")
+    #   client = ArduinoCloudClient(device_id=DEVICE_ID, username=DEVICE_ID, password=SECRET_KEY)
     client = ArduinoCloudClient(
         device_id=DEVICE_ID,
         ssl_params={