fix: actually include sensor firmware version string in repo, /version response

lib/localiser/mqtt/router.ex

@@ -30,7 +30,7 @@ defmodule Localiser.MQTT.Router do
         handle_rssi(sensor_id, payload)
 
       {:announce, sensor_id} ->
-        handle_announce(sensor_id)
+        handle_announce(sensor_id, payload)
 
       {:error, :invalid_topic} ->
         Logger.debug("[MQTT.Router] Received message with invalid topic: #{topic}")
@@ -70,8 +70,14 @@ defmodule Localiser.MQTT.Router do
     end
   end
 
-  defp handle_announce(sensor_id) do
-    case Sensors.upsert_announced(sensor_id) do
+  defp handle_announce(sensor_id, payload) do
+    version =
+      case Jason.decode(payload) do
+        {:ok, %{"version" => v}} when is_binary(v) -> v
+        _ -> nil
+      end
+
+    case Sensors.upsert_announced(sensor_id, version) do
       {:ok, _sensor} ->
         Logger.info("[MQTT.Router] Sensor announced: #{sensor_id}")