diff --git a/src/combined.py b/src/combined.py
new file mode 100644
index 0000000..bfb30fa
--- /dev/null
+++ b/src/combined.py
@@ -0,0 +1,63 @@
+# combined.py  15/05/2016  D.J.Whale
+#
+# A simple demo of combining both FSK (MiHome) and OOK (green button legacy)
+#
+# NOTE: This is only a test harness.
+# If you really want a nice way to control these devices, wait for the 'device classes'
+# issues to be implemented and tested on top of the raw radio interface, as these
+# will be much nicer to use.
+
+import time
+from energenie import Messages, OpenThings, radio, encoder
+
+# build FSK messages for MiHome purple
+
+PURPLE_ID = 0x68B # captured from a real device using Monitor.py
+m = OpenThings.alterMessage(
+    Messages.SWITCH,
+    header_sensorid=PURPLE_ID,
+    recs_0_value=1)
+purple_on = OpenThings.encode(m)
+
+m = OpenThings.alterMessage(
+    Messages.SWITCH,
+    header_sensorid=PURPLE_ID,
+    recs_0_value=0)
+purple_off = OpenThings.encode(m)
+
+# build OOK messages for legacy green button
+
+GREEN_ON  = encoder.build_switch_msg(True, device_address=1)
+GREEN_OFF = encoder.build_switch_msg(False, device_address=1)
+
+
+def switch_loop():
+    print("Turning both ON")
+    radio.transmitter(ook=True)
+    radio.transmit(GREEN_ON)
+    radio.transmitter(fsk=True)
+    radio.transmit(purple_on)
+    time.sleep(2)
+
+    print("Turning both OFF")
+    radio.transmitter(ook=True)
+    radio.transmit(GREEN_OFF)
+    radio.transmitter(fsk=True)
+    radio.transmit(purple_off)
+    time.sleep(2)
+
+
+if __name__ == "__main__":
+
+    print("starting combined switch tester")
+    print("radio init")
+    radio.init()
+
+    try:
+        while True:
+            switch_loop()
+
+    finally:
+        radio.finished()
+
+# END