diff --git a/src/legacy.py b/src/legacy.py
index ddd5384..cb947a6 100644
--- a/src/legacy.py
+++ b/src/legacy.py
@@ -8,7 +8,70 @@
 # Please don't use this as the basis for an application, it is only designed to be used
 # to test the lower level code.
 
-#TODO
+# switch.py  17/03/2016  D.J.Whale
+#
+# Control Energenie switches.
+# Note, at the moment, this only works with MiHome Adaptor Plus devices
+# because the 'sensorid' is discovered via the monitor message.
+# You could probably fake it by preloading the directory with your sensorid
+# if you know what it is.
+
+# Note, this is *only* a test program, to exercise the lower level code.
+# Don't expect this to be a good starting point for an application.
+# Consider waiting for me to finish developing the device object interface first.
+
+import time
+
+from energenie import  Devices, radio
+from energenie import radio
+from Timer import Timer
+
+TX_RATE = 10 # seconds between each switch change cycle
+
+def warning(msg):
+    print("warning:%s" % str(msg))
+
+def trace(msg):
+    print("monitor:%s" % str(msg))
+
+
+#----- TEST APPLICATION -------------------------------------------------------
+
+def legacy_switch_loop():
+    """Listen to sensor messages, and turn switches on and off every few seconds"""
+
+    radio.transmitter(ook=True)
+
+    # Transmit a code multiple times and program it into the switch
+    print("Press the LEARN button on the switch for 5 secs until LED flashes")
+    raw_input("press ENTER when LED is flashing")
+
+    ON = radio.build_OOK_relay_msg(True)
+    OFF = radio.build_OOK_relay_msg(False)
+
+    while True:
+        print("sending ON")
+        radio.send_payload_repeat(ON, 8)
+        print("waiting")
+        time.sleep(2)
+
+        print("sending OFF")
+        radio.send_payload_repeat(OFF, 8)
+        print("waiting")
+        
+
+if __name__ == "__main__":
+
+    trace("starting legacy switch tester")
+    radio.init()
+
+    try:
+        legacy_switch_loop()
+
+    finally:
+        radio.finished()
+
+# END
 
 
 # END