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Oct 23, 2023
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examples: Add WDT example. #74

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19 changes: 19 additions & 0 deletions examples/micropython.py
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Original file line number Diff line number Diff line change
Expand Up @@ -41,6 +41,12 @@ def user_task(client):
client["clight"].bri = round(uniform(0, 100), 1)


def wdt_task(client):
global wdt
# Update the WDT to prevent it from resetting the system
wdt.feed()


def wifi_connect():
if not WIFI_SSID or not WIFI_PASS:
raise (Exception("Network is not configured. Set SSID and passwords in secrets.py"))
Expand Down Expand Up @@ -109,5 +115,18 @@ def wifi_connect():
# to client.register().
client.register(Task("user_task", on_run=user_task, interval=1.0))

# If a Watchdog timer is available, it can be used to recover the system by resetting it, if it ever
# hangs or crashes for any reason. NOTE: once the WDT is enabled it must be reset periodically to
# prevent it from resetting the system, which is done in another user task.
# NOTE: Change the following to True to enable the WDT.
if False:
try:
from machine import WDT
# Enable the WDT with a timeout of 5s (1s is the minimum)
wdt = WDT(timeout=7500)
client.register(Task("watchdog_task", on_run=wdt_task, interval=1.0))
except (ImportError, AttributeError):
pass

# Start the Arduino IoT cloud client.
client.start()