feat: parse beacon type from sensor readings

lib/localiser/mqtt/router.ex

@@ -52,10 +52,11 @@ defmodule Localiser.MQTT.Router do
 
   defp handle_rssi(sensor_id, payload) do
     case Jason.decode(payload) do
-      {:ok, %{"id" => tag_id, "rssi" => rssi} = decoded} ->
+      {:ok, %{"id" => id, "rssi" => rssi, "type" => type} = decoded} ->
         reading = %{
+          type: type,
           sensor_id: sensor_id,
-          tag_id: tag_id,
+          tag_id: "#{type}:#{id}",
           rssi: rssi,
           tx_power: Map.get(decoded, "tx_power"),
           timestamp: DateTime.utc_now()
@@ -63,17 +64,6 @@ defmodule Localiser.MQTT.Router do
         Localiser.MQTT.Telemetry.count_reading()
         Localiser.RSSI.Buffer.push(reading)
 
-      {:ok, %{"tag_id" => tag_id, "rssi" => rssi}} ->
-        reading = %{
-          sensor_id: sensor_id,
-          tag_id: tag_id,
-          rssi: rssi,
-          tx_power: nil,
-          timestamp: DateTime.utc_now()
-        }
-        Localiser.MQTT.Telemetry.count_reading()
-        Localiser.RSSI.Buffer.push(reading)
-
       {:error, reason} ->
         Logger.error("[MQTT.Router] Bad payload from #{sensor_id}: #{inspect(reason)}")
         Localiser.MQTT.Telemetry.count_error()