HEMS lookout

Send notifications whenever a HEMS is heading towards any POI from a customisable list.

Notification messages are made up of callsign, registration and href to adsbexchange.com map, in addition to the POI name.

Notifications are being sent using Firebase Cloud Messaging. To configure Google Service Accounts and permissions, see the Google Cloud Console.

Files

• $HOME/hems-lookout.conf

  May contain shell variables to be sourced upon start.

• $HOME/hems-lookout-users.json

  "Database" containing FCM tokens and associated POIs.

• query-adsb.sh

  Retrieve ADS-B data from rapidapi.com and store them in data/adsb as xz. Filter by squawk and registration regex, save result to data/hems as JSON. Then call notify.py on the latter.

• notify.py

  Check json data gathered by query-adsb.sh against POIs in notify.json and send FCM notifications for each match. FCM authentication data is expected as service account JSON data in configurable locations.

• notify.json

  Define notification settings - multiple POIs per recipient (as FCM tokens).

  [
      {
          "recipient": "fcm_token",
          "locations": [
              {
                  "name": "BGU Ludwigshafen",
                  "lat": 49.4865268,
                  "lon": 8.3892466
              },
              {
                  ...
              }
          ]
      }
  ]

• serviceAccount.json

  Service account authentication config.

  Format is like:

  {
      "type": "service_account",
      "project_id": "hems-lookout",
      "private_key_id": "4242424242424242424242424242424242424242",
      "private_key": "-----BEGIN PRIVATE KEY-----\n...\n-----END PRIVATE KEY-----\n",
      "client_email": "example@hems-lookout.iam.gserviceaccount.com",
      "client_id": "000000000000000000000",
      "auth_uri": "https://accounts.google.com/o/oauth2/auth",
      "token_uri": "https://oauth2.googleapis.com/token",
      "auth_provider_x509_cert_url": "https://www.googleapis.com/oauth2/v1/certs",
      "client_x509_cert_url": "https://www.googleapis.com/robot/v1/metadata/x509/example%40hems-lookout.iam.gserviceaccount.com",
      "universe_domain": "googleapis.com"
  }
  

  Manage service accounts in the Google Cloud Console

• gcmath.py

  Module defining LatLon classs and great circle calculations.

• deploy.sh

  Synchronise required files to remote.

• install.sh

  Set up Python venv and cronjob.

Environment

• RAPIDAPI_KEY_ADSBEXCHANGE

  Key to authenticate against https://adsbexchange-com1.p.rapidapi.com/v2.

• HEMS_LOOKOUT_FCM_AUTH

  Specify location of Firebase service account data file required by notify.py.

• HEMS_LOOKOUT_FCM_AUTH_STR

  For testing, specify Firebase service account data as string. Required by test_notify.py, to create the service account file from a secret. Takes precedence over HEMS_LOOKOUT_FCM_AUTH.