Commit fe00da9

@@ -0,0 +1,7 @@
+
+FROM python:3.7-alpine
+RUN apk add musl-dev gcc linux-headers && \
+    pip install pywemo && \
+    apk del musl-dev gcc linux-headers 
+ADD three-way-switches.py /three-way-switches.py
+CMD python3 /three-way-switches.py

@@ -0,0 +1,1 @@
+sudo docker run --network host -it pywemo 

@@ -0,0 +1,75 @@
+import pywemo
+
+NUM_WEMO_DEVICES = 12
+
+# Context: dumbswitch is just a button that looks like a light switch
+
+class ThreeWaySwitch:
+  def __init__(self, regsub, name, notswitch_mac, dimmer_mac):
+    self.name = name
+    self.notswitch_mac = notswitch_mac
+    self.dimmer_mac = dimmer_mac
+    self.dimmer = None # set during discovery 
+    self.notswitch = None # set during discovery
+    self.regsub = regsub
+
+  def discover(self):
+    while self.dimmer == None or self.notswitch == None: 
+      print("Searching for \"%s\" devices ... " % self.name, end='')
+      devices = pywemo.discover_devices()
+      print("saw %d/%d devices." % (len(devices) , NUM_WEMO_DEVICES))
+      for d in devices:
+        if d.mac == self.dimmer_mac: 
+          self.dimmer = d
+        if d.mac == self.notswitch_mac: 
+          self.notswitch = d
+    print ("dimmer:     {:24}{:24}{:12}".format(self.dimmer.name, self.dimmer.host, self.dimmer.mac))
+    print ("notswitch:  {:24}{:24}{:12}".format(self.notswitch.name, self.notswitch.host, self.notswitch.mac))
+
+  def sync(self):
+    self.dimmer.set_state(0)
+    self.notswitch.set_state(0)
+
+  def register_callbacks(self):
+    self.regsub.register(self.dimmer)
+    self.regsub.register(self.notswitch)
+    self.regsub.on(self.dimmer, "BinaryState", self.toggle_callback)
+    self.regsub.on(self.notswitch, "BinaryState", self.toggle_callback)
+    print()
+
+  def toggle_callback(self, device, cb_type, value):
+    print ("  {:16}{:24}{:24}{:12}".format(self.name, device.name, cb_type, value))
+    if device.mac == self.dimmer.mac:
+      self.notswitch.set_state(value)
+    if device.mac == self.notswitch.mac:
+      self.dimmer.set_state(value)
+        
+
+# a useful function not really needed for the 3way daemon
+#find_and_show_all_wemo_devices()
+def find_and_show_all_wemo_devices():
+  devices = {}
+  while len(devices) < NUM_WEMO_DEVICES:
+    print("discovering devices ... ", end='')
+    devices = pywemo.discover_devices()
+    print("%d/%d" % (len(devices) , NUM_WEMO_DEVICES))
+
+  print ("--- %d Devices Found ---" % len(devices))
+  for d in devices:
+    print ("  {:24}{:16}{:12}".format(d.name, d.host, d.mac))
+
+
+regsub = pywemo.SubscriptionRegistry()
+
+# three way switches: (Name, dummy switch MAC, dimmer switch MAC)
+kitchen = ThreeWaySwitch(regsub, "Kitchen Dimmer", "24F5A25D64CC", "58EF68BB617A") 
+foyer = ThreeWaySwitch(regsub, "Foyer Dimmer", "94103E4E72A0", "58EF68BB756C")
+all_3ways = [kitchen, foyer]
+
+for t in all_3ways:
+  t.discover()
+  t.sync()
+  t.register_callbacks()
+
+print ("--- Starting Callback Handler Loop ---")
+regsub.start()