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Network switching. Make sure you're connecting with the priority that you want.

Works on Linux (relies on wpa_supplicant)


pip install netswitch


Network Switching

import time
import netswitch


switch = netswitch.NetSwitch([
    {'interface': 'wlan*', 'ssids': 'lifeline'},
    'eth*',  # equivalent to {'interface': 'eth*'}
    {'interface': 'wlan*'},  # implied - 'ssids': '*'

while True:
    connected = switch.check()
# or equivalently

For example, assume your setup is:

  • ifaces: wlan0 (built-in Pi 4 wifi), wlan1 (usb wifi dongle), ppp0 (cellular)
  • trusted ssids: nyu, nyu-legacy

Procedure - at any point in these steps, if we connect, we're finished:

  • check wlan1 for s0nycL1f3l1ne, if yes, connect
  • check wlan0 for s0nycL1f3l1ne, if yes, connect
  • check for eth0 and internet connected thru interface
  • check for ppp0 and internet connected thru interface
    • should we control wvdial or whatevs in this ???
  • check wlan1 for [nyu, nyu-legacy], if yes, connect
  • check wlan0 for [nyu, nyu-legacy], if yes, connect
  • check if internet is already connected thru any interface


  • tests - .travis.yml
  • eth0 connection, ppp0 connection
  • /etc/network/interfaces setup? / instructions?
  • restart interface if it's missing / not connected? maybe only 0, or if it showed up once?
  • time since connected - restart after a certain amount of time.

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