feat: include self-reported tx_power in measurement calls

lib/localiser/mqtt/router.ex

@@ -51,20 +51,29 @@ defmodule Localiser.MQTT.Router do
   end
 
   defp handle_rssi(sensor_id, payload) do
-    with {:ok, %{"tag_id" => tag_id, "rssi" => rssi}} <-
-           Jason.decode(payload) do
+    case Jason.decode(payload) do
+      {:ok, %{"id" => tag_id, "rssi" => rssi} = decoded} ->
+        reading = %{
+          sensor_id: sensor_id,
+          tag_id: tag_id,
+          rssi: rssi,
+          tx_power: Map.get(decoded, "tx_power"),
+          timestamp: DateTime.utc_now()
+        }
+        Localiser.MQTT.Telemetry.count_reading()
+        Localiser.RSSI.Buffer.push(reading)
 
-      reading = %{
-        sensor_id: sensor_id,
-        tag_id: tag_id,
-        rssi: rssi,
-        timestamp: DateTime.utc_now()
-      }
+      {: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)
 
-      Localiser.MQTT.Telemetry.count_reading()
-      Localiser.RSSI.Buffer.push(reading)
-
-    else
       {:error, reason} ->
         Logger.error("[MQTT.Router] Bad payload from #{sensor_id}: #{inspect(reason)}")
         Localiser.MQTT.Telemetry.count_error()