Undecoded default subscribe (#68)

Set the default undecoded topic to match OMG binary esp32dev-ble-mqtt-undecoded, and add docs

Author: 1technophile

TheengsGateway/__init__.py

@@ -33,7 +33,7 @@
     "ble_scan_time":5,
     "ble_time_between_scans":5,
     "publish_topic": "home/TheengsGateway/BTtoMQTT",
-    "subscribe_topic": "home/TheengsGateway/+",
+    "subscribe_topic": "home/+/BTtoMQTT/undecoded",
     "log_level": "WARNING",
     "discovery": 1,
     "hass_discovery": 1,

docs/use/use.md

@@ -87,7 +87,7 @@ docker run --rm \
     -e MQTT_USERNAME=<username> \
     -e MQTT_PASSWORD=<password> \
     -e MQTT_PUB_TOPIC=home/TheengsGateway/BTtoMQTT \
-    -e MQTT_SUB_TOPIC=home/TheengsGateway/commands \
+    -e MQTT_SUB_TOPIC=home/+/BTtoMQTT/undecoded \
     -e PUBLISH_ALL=true \
     -e TIME_BETWEEN=60 \
     -e SCAN_TIME=60 \
@@ -137,6 +137,12 @@ Example message:
 ```
 If possible, the data will be decoded and published.
 
+[OpenMQTTGateway](https://docs.openmqttgateway.com/), proposes a [web upload](https://docs.openmqttgateway.com/upload/web-install.html) binary `esp32dev-ble-mqtt-undecoded` that will publish directly to 'home/<gateway name>/BTtoMQTT` making it directly compatible with Theengs Gateway MQTTtoMQTT decoding feature.
+
+:::tip
+By default Theengs Gateway will listen to `home/+/BTtoMQTT/undecoded`, if you have several ESP32 gateways with OpenMQTTGateway undecoded, Theengs will pickup all of them and centralize the decoded BT sensor data in one place.
+:::
+
 ## Home Assistant auto discovery
 If enabled (default), decoded devices will publish their configuration to Home Assistant to be discovered.
 - This can be enabled/disabled with the `-D` or `--discovery` command line argument with a value of 1 (enable) or 0 (disable).