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Content # run.py [MAC] [offset in min] import sys import bluepy.btle as btle from datetime import datetime if (len(sys.argv) > 1): mac = str(sys.argv[1]) else: mac = "CA:4D:10:C3:20:19" if (len(sys.argv) > 2): offset = int(sys.argv[2]) else: offset = 0 print('connecting to %s' % mac) p = btle.Peripheral('CA:4D:10:EA:7F:0B') print('connected') c = p.getCharacteristics(uuid="42230201-2342-2342-2342-234223422342")[0] # seconds since unix utc_time_s = (datetime.utcnow() - datetime(1970, 1, 1)).total_seconds() # milliseconds [+ offset] time_ms = int((utc_time_s + offset * 60) * 1000) c.write(time_ms.to_bytes(8, byteorder='big')) print('time set') p.disconnect() print('disconnected')