Added MCP3008 backend

platypush/backend/sensor/mcp3008.py

@@ -0,0 +1,46 @@
+import logging
+import time
+
+from platypush.backend import Backend
+from platypush.context import get_plugin
+from platypush.message.event.sensor import SensorDataChangeEvent
+from platypush.plugins.gpio.sensor.mcp3008 import GpioSensorMcp3008Plugin
+
+
+class SensorMcp3008Backend(Backend):
+    last_measurement = {}
+
+    def __init__(self, poll_seconds=0.25, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        self.poll_seconds = poll_seconds
+        logging.info('Initialized MCP3008 analog sensors backend')
+
+
+    def send_message(self, msg):
+        pass
+
+
+    def run(self):
+        super().run()
+        plugin = get_plugin('gpio.sensor.mcp3008')
+
+        while not self.should_stop():
+            try:
+                measurement = plugin.get_measurement().output
+            except:
+                plugin = get_plugin('gpio.sensor.mcp3008', reload=True)
+
+            new_measurement = {}
+            for key in measurement.keys():
+                if key not in self.last_measurement \
+                        or measurement[key] != self.last_measurement[key]:
+                    new_measurement[key] = measurement[key]
+
+            if new_measurement:
+                self.bus.post(SensorDataChangeEvent(sensors=new_measurement))
+
+            time.sleep(self.poll_seconds)
+
+
+# vim:sw=4:ts=4:et:
+

platypush/message/event/sensor/__init__.py

@@ -0,0 +1,11 @@
+from platypush.message.event import Event
+
+
+class SensorDataChangeEvent(Event):
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+
+
+# vim:sw=4:ts=4:et:
+
+