feat: add factory_Reset, reconfigure_settings endpoints for sensors

lib/localiser/domain/sensors.ex

@@ -54,9 +54,28 @@ defmodule Localiser.Domain.Sensors do
     |> Repo.update()
   end
 
+  def factory_reset(%Sensor{} = sensor) do
+    Localiser.MQTT.Connection.publish(cmd_topic(sensor), Jason.encode!(%{action: "factory_reset"}))
+    {:ok, sensor}
+  end
+
+  # Pushes new WiFi and/or MQTT broker settings to the sensor. The sensor will
+  # apply the changes and restart. All keys are optional — omit any you don't
+  # want to change. Valid keys: "ssid", "password", "mqtt_host", "mqtt_port".
+  def reconfigure_settings(%Sensor{} = sensor, config) do
+    payload = Map.merge(
+      %{"action" => "reconfigure_settings"},
+      Map.new(config, fn
+        {"mqtt_broker", v} -> {"mqtt_host", v}
+        entry -> entry
+      end)
+    )
+    Localiser.MQTT.Connection.publish(cmd_topic(sensor), Jason.encode!(payload))
+    {:ok, sensor}
+  end
+
   def delete_sensor(%Sensor{} = sensor) do
-    topic = "localiser/sensor/#{sensor.sensor_id}/cmd"
+    factory_reset(sensor)
-    Localiser.MQTT.Connection.publish(topic, Jason.encode!(%{command: "factory_reset"}))
     Repo.delete(sensor)
   end
 
@@ -164,6 +183,8 @@ defmodule Localiser.Domain.Sensors do
     end
   end
 
+  defp cmd_topic(sensor), do: "localiser/sensor/#{sensor.sensor_id}/cmd"
+
   defp populate_floor_coords(%Sensor{room: nil} = sensor), do: sensor
 
   defp populate_floor_coords(%Sensor{room: room} = sensor) do

lib/localiser/web/controllers/sensor_controller.ex

@@ -77,6 +77,23 @@ defmodule Localiser.Web.Controllers.SensorController do
       unauthorized: {"Unauthorized", "application/json", Schemas.Error}
     ]
 
+  operation :factory_reset,
+    summary: "Send factory reset command to sensor",
+    parameters: [id: [in: :path, type: :integer, required: true]],
+    responses: [
+      ok: {"Command sent", "application/json", Schemas.CommandSent},
+      unauthorized: {"Unauthorized", "application/json", Schemas.Error}
+    ]
+
+  operation :reconfigure,
+    summary: "Push new network settings to sensor",
+    parameters: [id: [in: :path, type: :integer, required: true]],
+    request_body: {"Reconfigure params", "application/json", Schemas.SensorReconfigureParams, required: true},
+    responses: [
+      ok: {"Command sent", "application/json", Schemas.CommandSent},
+      unauthorized: {"Unauthorized", "application/json", Schemas.Error}
+    ]
+
   operation :calibration_start,
     summary: "Begin RSSI calibration",
     parameters: [id: [in: :path, type: :integer, required: true]],
@@ -181,6 +198,19 @@ defmodule Localiser.Web.Controllers.SensorController do
     end
   end
 
+  def factory_reset(conn, %{"id" => id}) do
+    sensor = Sensors.get_sensor!(id)
+    {:ok, _} = Sensors.factory_reset(sensor)
+    json(conn, %{status: "ok"})
+  end
+
+  def reconfigure(conn, %{"id" => id} = params) do
+    sensor = Sensors.get_sensor!(id)
+    config = Map.take(params, ["ssid", "password", "mqtt_broker", "mqtt_port"])
+    {:ok, _} = Sensors.reconfigure_settings(sensor, config)
+    json(conn, %{status: "ok"})
+  end
+
   def calibration_start(conn, %{"id" => id, "reference_distance" => ref_dist}) do
     sensor = Sensors.get_sensor!(id)
     :ok = SensorServer.begin_calibration(sensor.sensor_id, ref_dist)

lib/localiser/web/router.ex

@@ -82,6 +82,8 @@ defmodule Localiser.Web.Router do
     delete "/sensors/:id",                     SensorController, :delete
     put    "/sensors/:id/place",               SensorController, :place
     delete "/sensors/:id/place",               SensorController, :unplace
+    post   "/sensors/:id/factory_reset",       SensorController, :factory_reset
+    post   "/sensors/:id/reconfigure",         SensorController, :reconfigure
     post   "/sensors/:id/calibration/start",   SensorController, :calibration_start
     post   "/sensors/:id/calibration/stop",    SensorController, :calibration_stop
   end

lib/localiser/web/schemas.ex

@@ -124,6 +124,15 @@ defmodule Localiser.Web.Schemas do
     })
   end
 
+  defmodule CommandSent do
+    require OpenApiSpex
+    OpenApiSpex.schema(%{
+      title: "CommandSent", type: :object,
+      properties: %{status: %Schema{type: :string, enum: ["ok"]}},
+      required: [:status]
+    })
+  end
+
   defmodule CalibrationStatus do
     require OpenApiSpex
     OpenApiSpex.schema(%{
@@ -246,6 +255,19 @@ defmodule Localiser.Web.Schemas do
     })
   end
 
+  defmodule SensorReconfigureParams do
+    require OpenApiSpex
+    OpenApiSpex.schema(%{
+      title: "SensorReconfigureParams", type: :object,
+      properties: %{
+        ssid:        %Schema{type: :string},
+        password:    %Schema{type: :string, format: :password},
+        mqtt_broker: %Schema{type: :string, required: false},
+        mqtt_port:   %Schema{type: :integer, required: false}
+      }
+    })
+  end
+
   defmodule SensorUpdateParams do
     require OpenApiSpex
     OpenApiSpex.schema(%{