Update changelog. Bump version.

Author: brocaar

docs/config.toml

@@ -62,5 +62,5 @@ theme = "chirpstack-hugo-theme"
     weight = 8
 
 [params]
-    version = "3.6.0"
+    version = "3.7.0"
 	component = "chirpstack-gateway-bridge"

docs/content/backends/concentratord.md

@@ -0,0 +1,32 @@
+---
+title: Concentratord
+description: ChirpStack Concentratord backend.
+menu:
+  main:
+    parent: backends
+---
+
+# ChirpStack Concentratord backend
+
+**This backend is experimental!**
+
+The Concentratord backend implements the [ChirpStack Concentratord](https://github.com/brocaar/chirpstack-concentratord)
+[ZeroMQ](https://zeromq.org/) based interface.
+
+## Deployment
+
+The ChirpStack Gateway Bridge and the ChirpStack Concentratord must be deployed
+on the gateway.
+
+## Prometheus metrics
+
+The ChirpStack Concentratord backend exposes several [Prometheus](https://prometheus.io/)
+metrics for monitoring.
+
+### backend_concentratord_event_count
+
+The number of received events from Concentratord (per event type).
+
+### backend_concentratord_command_count
+
+The number of commands sent to Concentratord (per command type).

docs/content/overview/changelog.md

@@ -10,6 +10,27 @@ description: Lists the changes per ChirpStack Gateway Bridge release, including
 
 # Changelog
 
+## v3.7.0
+
+### Features
+
+#### Concentratord backend
+
+The [Concentratord](https://www.chirpstack.io/gateway-bridge/backends/concentratord/) backend is compatible with the
+[ChirpStack Concentratord](https://github.com/brocaar/chirpstack-concentratord)
+daemon. Please note that this backend is experimental.
+
+### Improvements
+
+* Change MQTT max. reconnect interval default value to 1 minute.
+* Refactor MQTT subscribe / unsubscribe logic.
+
+### Bugfixes
+
+* Use DevEUI object length instead of JoinEUI. ([#154](https://github.com/brocaar/chirpstack-gateway-bridge/pull/154))
+* Remove default values for BasicStation filters. ([#157](https://github.com/brocaar/chirpstack-gateway-bridge/issues/157))
+* Fix BasicStation websocket ping loop. ([#156](https://github.com/brocaar/chirpstack-gateway-bridge/issues/156))
+
 ## v3.6.0
 
 ### Features