Cellular network backup on hassio

Feature Requests
6

Spent some time loading home assistant supervised so I could check this out on a generic version of linux. I used ubuntu 18.04 for odriod xu4. The following python script does exactly what is required on a standard linux distribution. The default route switches and the home assistant container traffic switches paths. I only tested with pings from the container. At some point I’ll test with the home assistant cloud.

#!/usr/bin/python3
import os
import time

primeNIC = "eth0"
backupNIC = "wlan0"

testHost = "8.8.8.8" 
onbackup = False

lowMetric = "50"
highMetric = "200"


os.system("ifmetric " + primeNIC + " " + lowMetric)
os.system("ifmetric " + backupNIC + " " + highMetric)

while True:
    response = os.system("ping -I " + primeNIC + " -c 1 " + testHost)
    # and then check the response...
    if response == 0:
        pingstatus = "Network Active"
        print("Status "+ pingstatus)
        if onbackup == True:
            print("Switching back to prime network!!")
            os.system("ifmetric " + primeNIC + " " + lowMetric)
            os.system("ifmetric " + backupNIC + " " + highMetric)
            onbackup = False
    else:
        pingstatus = "Network Error"
        print("Status "+ pingstatus)
        if onbackup == False:
            print("Switching backup network!!")
            os.system("ifmetric " + primeNIC + " " + highMetric)
            os.system("ifmetric " + backupNIC + " " + lowMetric)
            onbackup = True

    time.sleep( 10 )