38 lines
1.6 KiB
Python
38 lines
1.6 KiB
Python
import utime as time
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import socket
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import ustruct as struct
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import machine
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class NTP():
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def __init__(self, Logger):
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self.Logger = Logger
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def SetRTCTimeFromNTP(self, host, gmt_offset, auto_summertime):
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self.Logger.LogMessage("getting date and time from NTP " + host)
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NTP_DELTA = 2208988800
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NTP_QUERY = bytearray(48)
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NTP_QUERY[0] = 0x1B
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addr = socket.getaddrinfo(host, 123)[0][-1]
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s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
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try:
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s.settimeout(5)
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res = s.sendto(NTP_QUERY, addr)
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msg = s.recv(48)
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except Exception as err:
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self.Logger.LogMessage("Error: " + str(err))
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return False
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finally:
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s.close()
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ntp_time = struct.unpack("!I", msg[40:44])[0] + (3600 * gmt_offset) #gmt offset from config
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tm = time.gmtime(ntp_time - NTP_DELTA)
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if (auto_summertime):
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self.Logger.LogMessage("performing auto_summertime adjustment")
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#Time of March change for the current year
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t1 = time.mktime((tm[0],3,(31-(int(5*tm[0]/4+4))%7),1,0,0,0,0))
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#Time of October change for the current year
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t2 = time.mktime((tm[0],10,(31-(int(5*tm[0]/4+1))%7),1,0,0,0,0))
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t = time.mktime((tm[0], tm[1], tm[2], tm[6] + 1, tm[3], tm[4], tm[5], 0))
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if t >= t1 and t < t2:
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tm = time.gmtime(ntp_time - NTP_DELTA + 3600)
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machine.RTC().datetime((tm[0], tm[1], tm[2], tm[6] + 1, tm[3], tm[4], tm[5], 0))
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return True |