add simplest version of Huon's switch code, sending to mqtt

Signed-off-by: Huon Kane <huon.kane@hotmail.co.uk>

src/RPi/switch/main.py

@@ -0,0 +1,69 @@
+#!/usr/bin/python3
+
+import time
+import sys
+import socket
+#from subprocess import call
+import yaml
+import time
+import argparse
+
+import RPi.GPIO as GPIO
+
+
+# the config and mqtt modules are in a bad place atm :/
+import sys
+sys.path.append('./mqtt/')
+import config
+import mqtt
+
+
+DEVICENAME="switch"
+
+mqttHost = config.getValue("mqtthostname", "mqtt.local")
+myHostname = config.getValue("hostname", socket.gethostname())
+hostmqtt = mqtt.MQTT(mqttHost, myHostname, DEVICENAME)
+hostmqtt.loop_start()   # use the background thread
+
+# can do things like:
+#  mosquitto_pub -h mqtt -t two/DEVICENAME/play -m '{"operation": "theatrechase", "colour": "green"}'
+
+############
+def get(obj, name, default):
+    result = default
+    if name in obj:
+        result = obj[name]
+    return result
+
+##############
+
+hostmqtt.status({"status": "listening"})
+
+GPIO.setmode(GPIO.BOARD)
+
+GPIO.setup(11,GPIO.IN, pull_up_down=GPIO.PUD_DOWN)
+GPIO.setup(22,GPIO.IN, pull_up_down=GPIO.PUD_DOWN)
+
+state = -1
+try:
+    while True:
+        time.sleep(0.3)
+        if (GPIO.input(11) == 1):
+            if (state != 0):
+                #print("STATE CHANGE")
+                hostmqtt.publish("state", {"state": 0})
+            state = 0
+
+        if (GPIO.input(22) == 1):
+            if (state != 1):
+                #print("STATE CHANGE")
+                hostmqtt.publish("state", {"state": 1})
+            state = 1
+
+        print("State:", state)
+except Exception as ex:
+    traceback.print_exc()
+except KeyboardInterrupt:
+    print("exit")
+
+hostmqtt.status({"status": "STOPPED"})