Equally simple and dirty Python3 monitoring script for Brandmeister Repeaters, using the Brandmeister API rather than querying a Master server directly. It check whether the last_updated timestamp occurred within the last 5 minutes. This could probably be tuned down.

rept_monitor_api.py

#!/usr/bin/python3
from gpiozero import StatusBoard
import requests
import datetime
import time

# instantiate a StatusBoard instance
status = StatusBoard('gb7ny', 'gb7hi', 'gb7mw','gb7ah','gb7ni')

# define the check function
def bmcheck():
  threshold = datetime.datetime.now()-datetime.timedelta(minutes=5)
  # gb7ny
  gb7ny = requests.get('http://api.brandmeister.network/v1.0/repeater/?action=GET&q=235510')
  nydata = gb7ny.json()
  nyts = nydata['last_updated']
  if nyts > str(threshold):
    status.gb7ny.lights.green.on()
    status.gb7ny.lights.red.off()
  else:
    status.gb7ny.lights.green.off()
    status.gb7ny.lights.red.on()
  # gb7hi
  gb7hi = requests.get('http://api.brandmeister.network/v1.0/repeater/?action=GET&q=235526')
  hidata = gb7hi.json()
  hits = hidata['last_updated']
  if hits > str(threshold):
    status.gb7hi.lights.green.on()
    status.gb7hi.lights.red.off()
  else:
    status.gb7hi.lights.green.off()
    status.gb7hi.lights.red.on()
  # gb7mw
  gb7mw = requests.get('http://api.brandmeister.network/v1.0/repeater/?action=GET&q=235506')
  mwdata = gb7mw.json()
  mwts = mwdata['last_updated']
  if mwts > str(threshold):
    status.gb7mw.lights.green.on()
    status.gb7mw.lights.red.off()
  else:
    status.gb7mw.lights.green.off()
    status.gb7mw.lights.red.on()
  # gb7ah
  gb7ah = requests.get('http://api.brandmeister.network/v1.0/repeater/?action=GET&q=235507')
  ahdata = gb7ah.json()
  ahts = ahdata['last_updated']
  if ahts > str(threshold):
    status.gb7ah.lights.green.on()
    status.gb7ah.lights.red.off()
  else:
    status.gb7ah.lights.green.off()
    status.gb7ah.lights.red.on()
  # gb7ni
  gb7ni = requests.get('http://api.brandmeister.network/v1.0/repeater/?action=GET&q=235516')
  nidata = gb7ni.json()
  nits = nidata['last_updated']
  if nits > str(threshold):
    status.gb7ni.lights.green.on()
    status.gb7ni.lights.red.off()
  else:
    status.gb7ni.lights.green.off()
    status.gb7ni.lights.red.on()
  time.sleep(60)

# Run the function forever
while True:
    bmcheck()