various esphome changes

esphome/common/mqtt_common.yaml

@@ -0,0 +1,21 @@
+#############################################
+# SYSTEM SPECIFIC VARIABLE SUBSTITUTIONS
+#############################################
+substitutions:
+  mqtt_server: !secret ha_mqtt_server
+  mqtt_username: !secret ha_mqtt_username
+  mqtt_password: !secret ha_mqtt_password
+  mqtt_topic: "esphome" #main topic for the mqtt server, call it what you like
+
+#############################################
+# MQTT Monitoring
+# https://esphome.io/components/mqtt.html?highlight=mqtt
+# MUST also have api enabled if you enable MQTT
+#############################################
+mqtt:
+  broker: ${mqtt_server}
+  topic_prefix: ${mqtt_topic}/${devicename}
+  username: ${mqtt_username}
+  password: ${mqtt_password}
+  discovery: false # enable entity discovery (true is default, we don't want two HA Instances)
+  id: mqtt_client