Add MQTT Subscribe sensor (#175)

esphomeyaml/components/sensor/mqtt_subscribe.py

@@ -0,0 +1,29 @@
+import voluptuous as vol
+
+from esphomeyaml.components import sensor
+import esphomeyaml.config_validation as cv
+from esphomeyaml.const import CONF_MAKE_ID, CONF_NAME, CONF_QOS, CONF_TOPIC
+from esphomeyaml.helpers import App, Application, add, variable
+
+DEPENDENCIES = ['mqtt']
+
+MakeMQTTSubscribeSensor = Application.MakeMQTTSubscribeSensor
+
+PLATFORM_SCHEMA = cv.nameable(sensor.SENSOR_PLATFORM_SCHEMA.extend({
+    cv.GenerateID(CONF_MAKE_ID): cv.declare_variable_id(MakeMQTTSubscribeSensor),
+    vol.Required(CONF_TOPIC): cv.subscribe_topic,
+    vol.Optional(CONF_QOS): cv.mqtt_qos,
+}))
+
+
+def to_code(config):
+    rhs = App.make_mqtt_subscribe_sensor(config[CONF_NAME], config[CONF_TOPIC])
+    make = variable(config[CONF_MAKE_ID], rhs)
+
+    if CONF_QOS in config:
+        add(make.Psensor.set_qos(config[CONF_QOS]))
+
+    sensor.setup_sensor(make.Psensor, make.Pmqtt, config)
+
+
+BUILD_FLAGS = '-DUSE_MQTT_SUBSCRIBE_SENSOR'