Add nerves firmware uuid to bot state

lib/farmbot/bot_state/bot_state.ex

@@ -181,7 +181,8 @@ defmodule Farmbot.BotState do
     info_settings = %{
       initial_state.informational_settings |
       node_name: node(),
-      currently_on_beta: settings["currently_on_beta"]
+      currently_on_beta: settings["currently_on_beta"],
+      firmware_uuid: Farmbot.System.NervesHub.uuid()
     }
     if Process.whereis(Farmbot.Farmware.Supervisor) do
       send(self(), :reindex_farmware)
@@ -421,6 +422,7 @@ defmodule Farmbot.BotState do
       memory_usage: 0, # megabytes
       disk_usage: 0, # percent
       currently_on_beta: nil,
+      firmware_uuid: nil
     },
     location_data: %{
       position: %{x: nil, y: nil, z: nil},

lib/farmbot/system/nerves_hub/nerves_hub.ex

@@ -42,6 +42,9 @@ defmodule Farmbot.System.NervesHub do
   @doc "Should return a url to an update or nil."
   @callback check_update() :: String.t() | nil
 
+  @doc "Should return the uuid of the running firmware"
+  @callback uuid :: String.t()
+
   use GenServer
   use Farmbot.Logger
 
@@ -139,4 +142,8 @@ defmodule Farmbot.System.NervesHub do
     Logger.debug 1, "Check update OTA Server"
     @handler.check_update()
   end
+
+  def uuid do
+    @handler.uuid()
+  end
 end

platform/host/nerves_hub_handler.ex

@@ -24,4 +24,6 @@ defmodule Farmbot.Host.NervesHubHandler do
   ]
 
   def check_update, do: nil
+
+  def uuid, do: "1b10e3bb-ca47-52b1-f147-691fb90ebdd5"
 end

platform/target/nerves_hub_client.ex

@@ -25,6 +25,8 @@ defmodule Farmbot.System.NervesHubClient do
     |> String.trim()
   end
 
+  def uuid, do: Nerves.Runtime.KV.get_active("nerves_fw_uuid")
+
   def serial_number, do: serial_number(Farmbot.Project.target())
 
   def connect do