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#NervesJPAdvent Calendar 2021

Day 13

ローカルにたてたFIWARE Orion Context BrokerにNervesで取得した温度・湿度データを送ってみました

Last updated at Posted at 2021-09-18

はじめに

FIWARE

  • FIWARE technology enables Smart Cities worldwide
  • なんだかすごそうです!

Nerves

とりあえずローカルでFIWARE Orion Context Brokerをイゴかしてみます1

docker-compose.yml
mongo:
  image: mongo:4.4
  command: --nojournal
orion:
  image: fiware/orion
  links:
    - mongo
  ports:
    - "1026:1026"
  command: -dbhost mongo
$ docker-compose up
$ curl localhost:1026/version
{
"orion" : {
  "version" : "3.1.0-next",
  "uptime" : "0 d, 0 h, 0 m, 13 s",
  "git_hash" : "7bd1e43514539bd65caeb30d4e3319202e0f115b",
  "compile_time" : "Mon Jul 26 08:19:44 UTC 2021",
  "compiled_by" : "root",
  "compiled_in" : "dae1c5e3a7d9",
  "release_date" : "Mon Jul 26 08:19:44 UTC 2021",
  "machine" : "x86_64",
  "doc" : "https://fiware-orion.rtfd.io/",
  "libversions": {
     "boost": "1_66",
     "libcurl": "libcurl/7.61.1 OpenSSL/1.1.1g zlib/1.2.11 nghttp2/1.33.0",
     "libmicrohttpd": "0.9.70",
     "openssl": "1.1",
     "rapidjson": "1.1.0",
     "mongoc": "1.17.4",
     "bson": "1.17.4"
  }
}
}

Nervesから温度・湿度データを送ってみます

準備

$ mix nerves.new hello_fiware
mix.exs
       {:nerves_system_rpi4, "~> 1.13", runtime: false, targets: :rpi4},
       {:nerves_system_bbb, "~> 2.8", runtime: false, targets: :bbb},
       {:nerves_system_osd32mp1, "~> 0.4", runtime: false, targets: :osd32mp1},
-      {:nerves_system_x86_64, "~> 1.13", runtime: false, targets: :x86_64}
+      {:nerves_system_x86_64, "~> 1.13", runtime: false, targets: :x86_64},
+      {:httpoison, "~> 1.8"},
+      {:jason, "~> 1.2"},
+      {:aht20, "~> 0.4.0"}
     ]
   end
$ export MIX_TARGET=rpi4
$ mix deps.get
$ mix firmware
  • microSDカードをmacOSに挿して、以下のコマンドで焼き込みます
$ mix burn
  • LANケーブルでRaspberry Pi(Nerves)をmacOSと同じネットワークに接続して電源ON:fire:

Run

  • :coffee: でも飲みながら15秒から30秒程度待ちましたら、sshでつないでIExで楽しみます
$ ssh nerves.local
Interactive Elixir (1.12.1) - press Ctrl+C to exit (type h() ENTER for help)
████▄▖    ▐███
█▌  ▀▜█▙▄▖  ▐█
█▌ ▐█▄▖▝▀█▌ ▐█   N  E  R  V  E  S
█▌   ▝▀█▙▄▖ ▐█
███▌    ▀▜████

Toolshed imported. Run h(Toolshed) for more info.
RingLogger is collecting log messages from Elixir and Linux. To see the
messages, either attach the current IEx session to the logger:

  RingLogger.attach

or print the next messages in the log:

  RingLogger.next

書き込み

iex> {:ok, pid} = AHT20.start_link(bus_name: "i2c-1", bus_address: 0x38)

iex> {:ok, %AHT20.Measurement{humidity_rh: humidity, temperature_c: temperature}} = AHT20.measure(pid)

iex> json = %{id: "Room", type: "Room", temperature: %{value: temperature, type: "Number"}, humidity: %{value: humidity, type: "Number"}} |> Jason.encode!

iex> HTTPoison.post "http://192.168.1.8:1026/v2/entities", json, [{"Content-Type", "application/json"}]                                                   
{:ok,
 %HTTPoison.Response{
 ...
  • :tada::tada::tada:
  • 成功しているようです
  • 192.168.1.8は、docker-compose upしてFIWARE Orion Context Brokerをイゴかしている私の家にあるmacOSのIPアドレスです

読み込み

iex> HTTPoison.get!("http://192.168.1.8:1026/v2/entities") |> Map.get(:body) |> Jason.decode!
[
  %{
    "humidity" => %{
      "metadata" => %{},
      "type" => "Number",
      "value" => 66.05091095
    },
    "id" => "Room",
    "temperature" => %{
      "metadata" => %{},
      "type" => "Number",
      "value" => 27.030181885
    },
    "type" => "Room"
  }
]
  • :tada::tada::tada:

Wrapping Up :lgtm::lgtm::lgtm::lgtm::lgtm:

  • 今日は「誰でもできるスマートシティ向けOSS : FIWAREのはじめかた」を参考にさらーっとなぞってみました
  • これからももっともっと触っていこうとおもっています2
    • FIWAREは2017年ころのスタート、その源流に相当するとおもわれる"Next Generation Service Interfaces" (NGSI)は2012年ころからあったという意味では、10年前の自分に教えてあげたいです
    • まあ私は昨日はじめて知ったということで、「次の10年の技術トレンド予想」の方がしっくりきますので**Qiita10th_未来**タグをつけました
  • Enjoy Elixir:rocket::rocket::rocket:
  1. イゴかす = 動かす。西日本のほうの方言(たぶん)。NervesJPではおなじみ。

  2. おもっています。あくまでもおもっています。

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