import urllib.request, tempfile, smtplib, email, time
from datetime import datetime, timedelta

tmpdir = tempfile.TemporaryDirectory() 
beginning = str((1000*int(time.time()))-(17*3600000))
end = str(1000*int(time.time()))

def get_boot_time():
    with open('/proc/uptime', 'r') as f:
        uptime_seconds = int(float(f.readline().split()[0]))
        boot_time = datetime.now() - timedelta(seconds=uptime_seconds) + timedelta(hours=1)
    return boot_time

def get_uptime():
    with open('/proc/uptime', 'r') as f:
        uptime_hours = round(float(f.readline().split()[0])/3600, 2)
    return uptime_hours

get_boot_time()

# Send an HTML email with an embedded image and a plain text message for
# email clients that don't want to display the HTML.

from email.mime.multipart import MIMEMultipart
from email.mime.text import MIMEText
from email.mime.image import MIMEImage

# Define these once; use them twice!
strFrom = 'pv-tannenstr@web.de'
strTo = ["tobias.siegel@outlook.com", "wsiegel@web.de"]

# Create the root message and fill in the from, to, and subject headers
msgRoot = MIMEMultipart('related')
msgRoot['Subject'] = datetime.today().strftime('%Y-%m-%d') + ' Darmstadt'
msgRoot['From'] = strFrom
msgRoot['To'] = ",".join(strTo)
msgRoot.preamble = 'This is a multi-part message in MIME format.'

# Encapsulate the plain and HTML versions of the message body in an
# 'alternative' part, so message agents can decide which they want to display.
msgAlternative = MIMEMultipart('alternative')
msgRoot.attach(msgAlternative)

msgText = MIMEText('This is the alternative plain text message.')
msgAlternative.attach(msgText)

# Get Boot Time and Convert it to String
bt = get_boot_time()
bt_str = bt.strftime("%d.%m.%Y, %H.%M")

# We reference the image in the IMG SRC attribute by the ID we give it dasdasdbelow
msgText = MIMEText('<br><p>Letzter Start: ' + bt_str + ' Uhr</p>', 'html')
msgAlternative.attach(msgText)

# Send the email (this example assumes SMTP authentication is required)
import smtplib, ssl
context = ssl.create_default_context()
with smtplib.SMTP('smtp.web.de', 587) as server:
    server.ehlo()  # Can be omitted
    server.starttls(context=context)
    server.ehlo()  # Can be omitted
    server.login(strFrom, 'PV-Tannenstr')
    server.sendmail(strFrom, strTo, msgRoot.as_string())

tmpdir.cleanup()