diff --git a/README.rst b/README.rst
index 671ca15..d1d7bbd 100644
--- a/README.rst
+++ b/README.rst
@@ -59,21 +59,17 @@ Usage Example
.. code-block:: python
+ import adafruit_connection_manager
import adafruit_ntp
- import socketpool
+ import os
import time
import wifi
- # Get wifi details and more from a secrets.py file
- try:
- from secrets import secrets
- except ImportError:
- print("WiFi secrets are kept in secrets.py, please add them there!")
- raise
+ wifi_ssid = os.getenv("CIRCUITPY_WIFI_SSID")
+ wifi_password = os.getenv("CIRCUITPY_WIFI_PASSWORD")
+ wifi.radio.connect(wifi_ssid, wifi_password)
- wifi.radio.connect(secrets["ssid"], secrets["password"])
-
- pool = socketpool.SocketPool(wifi.radio)
+ pool = adafruit_connection_manager.get_radio_socketpool(wifi.radio)
ntp = adafruit_ntp.NTP(pool, tz_offset=0)
while True:
diff --git a/adafruit_ntp.py b/adafruit_ntp.py
index b405402..5e9c790 100644
--- a/adafruit_ntp.py
+++ b/adafruit_ntp.py
@@ -22,10 +22,14 @@
import struct
import time
+from micropython import const
+
+
__version__ = "0.0.0+auto.0"
__repo__ = "https://github.com/adafruit/Adafruit_CircuitPython_NTP.git"
NTP_TO_UNIX_EPOCH = 2208988800 # 1970-01-01 00:00:00
+PACKET_SIZE = const(48)
class NTP:
@@ -55,7 +59,8 @@ def __init__(
self._pool = socketpool
self._server = server
self._port = port
- self._packet = bytearray(48)
+ self._socket_address = None
+ self._packet = bytearray(PACKET_SIZE)
self._tz_offset = int(tz_offset * 60 * 60)
self._socket_timeout = socket_timeout
@@ -71,21 +76,27 @@ def datetime(self) -> time.struct_time:
unless there has already been a recent request. Raises OSError exception if no response
is received within socket_timeout seconds"""
if time.monotonic_ns() > self.next_sync:
+ if self._socket_address is None:
+ self._socket_address = self._pool.getaddrinfo(self._server, self._port)[
+ 0
+ ][4]
+
self._packet[0] = 0b00100011 # Not leap second, NTP version 4, Client mode
- for i in range(1, len(self._packet)):
+ for i in range(1, PACKET_SIZE):
self._packet[i] = 0
with self._pool.socket(self._pool.AF_INET, self._pool.SOCK_DGRAM) as sock:
+ # Since the ESP32SPI doesn't support sendto, we are using
+ # connect + send to standardize code
sock.settimeout(self._socket_timeout)
- sock.sendto(self._packet, (self._server, self._port))
- sock.recvfrom_into(self._packet)
+ sock.connect(self._socket_address)
+ sock.send(self._packet)
+ sock.recv_into(self._packet)
# Get the time in the context to minimize the difference between it and receiving
# the packet.
destination = time.monotonic_ns()
poll = struct.unpack_from("!B", self._packet, offset=2)[0]
self.next_sync = destination + (2**poll) * 1_000_000_000
- seconds = struct.unpack_from(
- "!I", self._packet, offset=len(self._packet) - 8
- )[0]
+ seconds = struct.unpack_from("!I", self._packet, offset=PACKET_SIZE - 8)[0]
self._monotonic_start = (
seconds
+ self._tz_offset
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