feat: accept calibration readings only from a chosen tag

lib/localiser/web/channels/calibration_channel.ex

@@ -23,6 +23,16 @@ defmodule Localiser.Web.Channels.CalibrationChannel do
     {:noreply, socket}
   end
 
+  def handle_info({:calibration_scan_reading, _sensor_id, tag_id, rssi}, socket) do
+    push(socket, "scan_reading", %{tag_id: tag_id, rssi: rssi})
+    {:noreply, socket}
+  end
+
+  def handle_info({:calibration_tag_set, _sensor_id, tag_id}, socket) do
+    push(socket, "tag_set", %{tag_id: tag_id})
+    {:noreply, socket}
+  end
+
   def handle_info({:stage_started, _sensor_id, distance, completed_count}, socket) do
     push(socket, "stage_started", %{distance: distance, completed_stages: completed_count})
     {:noreply, socket}