add a reasonable default for cache_offset to all examples

Author: tedder

README.rst

@@ -70,7 +70,7 @@ Usage Example
     wifi.radio.connect(wifi_ssid, wifi_password)
 
     pool = adafruit_connection_manager.get_radio_socketpool(wifi.radio)
-    ntp = adafruit_ntp.NTP(pool, tz_offset=0)
+    ntp = adafruit_ntp.NTP(pool, tz_offset=0, cache_offset=3600)
 
     while True:
         print(ntp.datetime)

examples/ntp_connection_manager.py

@@ -33,7 +33,7 @@
 # get the socket pool from connection manager
 socket = adafruit_connection_manager.get_radio_socketpool(radio)
 
-# adjust tz_offset for locale...
-ntp = adafruit_ntp.NTP(socket, tz_offset=-5)
+# adjust tz_offset for locale, only ping NTP server every hour
+ntp = adafruit_ntp.NTP(socket, tz_offset=-5, cache_seconds=3600)
 
 print(ntp.datetime)

examples/ntp_cpython.py

@@ -9,7 +9,7 @@
 import adafruit_ntp
 
 # Don't use tz_offset kwarg with CPython because it will adjust automatically.
-ntp = adafruit_ntp.NTP(socket)
+ntp = adafruit_ntp.NTP(socket, cache_seconds=3600)
 
 while True:
     print(ntp.datetime)

examples/ntp_set_rtc.py

@@ -21,7 +21,7 @@
 wifi.radio.connect(secrets["ssid"], secrets["password"])
 
 pool = socketpool.SocketPool(wifi.radio)
-ntp = adafruit_ntp.NTP(pool, tz_offset=0)
+ntp = adafruit_ntp.NTP(pool, tz_offset=0, cache_seconds=3600)
 
 # NOTE: This changes the system time so make sure you aren't assuming that time
 # doesn't jump.

examples/ntp_simpletest.py

@@ -20,7 +20,7 @@
 wifi.radio.connect(secrets["ssid"], secrets["password"])
 
 pool = socketpool.SocketPool(wifi.radio)
-ntp = adafruit_ntp.NTP(pool, tz_offset=0)
+ntp = adafruit_ntp.NTP(pool, tz_offset=0, cache_offset=3600)
 
 while True:
     print(ntp.datetime)