adding relay script

scripts/relay.py

@@ -0,0 +1,42 @@
+#!/usr/bin/python
+
+import serial
+import sys
+import struct
+
+class Monitor:
+    def __init__(self):
+        self.serialPort = None
+
+    def open(self,portName,baud=9600):
+        self.serialPort = serial.Serial(portName, baud, timeout=0.5)
+        try:
+            self.serialPort.open()
+        except serial.SerialException, e:
+            sys.stderr.write("Could not open serial port %s: %s\n" % (self.serialPort.portstr, e))
+    def close(self):
+        self.serialPort.close()
+
+mon = Monitor()
+mon.open("/dev/ttyACM0")
+
+if len(sys.argv) > 1:
+    if sys.argv[1] == 'on':
+        state = 1
+    elif sys.argv[1] == 'off':
+        state = 0
+    else:
+        print("bad state, exiting")
+        sys.exit(1)
+    mon.serialPort.write(struct.pack("BBB",0xA6,1,state))
+    rsp = mon.serialPort.read(2)
+    ok = len(rsp) == 2 and rsp[0] == '\x00' and rsp[1] == '\x00'
+    if not ok:
+        print("Did not receive correct response!")
+        print("Response: "+",".join(map(lambda x:hex(ord(x)),rsp)))
+
+mon.close()
+
+
+
+