Update README.md

Author: aneisch

README.md

@@ -1,10 +1,8 @@
 # RTL_433 Thermopro MQTT container
 <a href="https://www.buymeacoffee.com/aneisch" target="_blank"><img src="https://cdn.buymeacoffee.com/buttons/default-black.png" width="150px" height="35px" alt="Buy Me A Coffee" style="height: 35px !important;width: 150px !important;" ></a><br>
 
-By default, listens for temperature messages from Thermopro and
-publishes to MQTT. Can be configured to listen for other device broadcasts. 
-
 ## Usage
+Tweak the rtl_433.config.example to you liking and expose it to the container if you wish to override default settings.
 
 ### Example docker-compose
 
@@ -14,16 +12,10 @@ services:
     thermopro_mqtt:
         container_name: thermopro_mqtt
         image: aneisch/rtl_433_mqtt:latest
-        environment:
-          - MQTT_SERVER=10.0.1.22
-          - MQTT_PORT=1883
-          - TOPIC=sensor/thermopro
-          # 97 = Thermopro https://github.com/merbanan/rtl_433/blob/master/README.md
-          - RTL_433_DEVICE=97
-          # Customary, si, or native (default)
-          - UNITS=customary
         restart: 'no'
         devices:
           - '/dev/rtl_433:/dev/bus/usb/003/002'
+        volumes:
+          - '/opt/433_mqtt/rtl_433_config.example:/home/rtl_433/.config/rtl_433.conf'
 ```