Python Heroku Deployエラー

Question

##やろうとしていること

• pythonプログラム(LINE Bot)をHerokuにDeployしたい。
• pythonプログラムは、LINEからのメッセージに応じてLEDを点灯させる。
• pythonプログラムの構成は、

　main.py
|---LED_ON.py
|---LED_OFF.py
main.pyから**"subprocess"**して、LED ON/OFFを制御しています。

##今の状況
ngrokを利用して、アプリケーションの動作確認まで完了しました。
恒久的に動作させたいので、herokuにdeployしたいと考えて、deployまで完了しました。

##困っていること
deploy後、LINEからメッセージを送信して動作確認を行いましたが、動作してくれません。

heroku logs --tailで確認したログには、次のエラーが書かれていました。
H10のエラー内容（対策）が分からず困っております。

pi@raspberrypi:~$ heroku logs --tail
2020-01-06T00:51:45.770911+00:00 app[api]: Release v1 created by user [e-mail]
2020-01-06T00:51:45.895427+00:00 app[api]: Enable Logplex by user [e-mail]
2020-01-06T00:51:45.770911+00:00 app[api]: Initial release by user [e-mail]
2020-01-06T00:51:45.895427+00:00 app[api]: Release v2 created by user [e-mail]
2020-01-06T00:54:00.000000+00:00 app[api]: Build started by user [e-mail]
2020-01-06T00:54:14.000000+00:00 app[api]: Build failed -- check your build output: https://dashboard.heroku.com/apps/647ef539-a427-42e3-8f75-93ff363be8a1/activity/builds/f3f4b6ad-e0f3-494c-a0cb-0d2b052cfa7e
2020-01-06T01:22:10.000000+00:00 app[api]: Build started by user [e-mail]
2020-01-06T01:22:24.000000+00:00 app[api]: Build failed -- check your build output: https://dashboard.heroku.com/apps/647ef539-a427-42e3-8f75-93ff363be8a1/activity/builds/38d4d44a-2c8a-4d88-97cf-b0ac9991142e
2020-01-06T01:32:27.000000+00:00 app[api]: Build started by user [e-mail]
2020-01-06T01:32:42.000000+00:00 app[api]: Build failed -- check your build output: https://dashboard.heroku.com/apps/647ef539-a427-42e3-8f75-93ff363be8a1/activity/builds/00e9a5d8-8a4f-473e-a955-a9049ee6cf2c
2020-01-06T01:41:16.000000+00:00 app[api]: Build started by user [e-mail]
2020-01-06T01:41:41.364303+00:00 app[api]: Deploy 862c12e4 by user [e-mail]
2020-01-06T01:41:41.387805+00:00 app[api]: Scaled to web@1:Free by user [e-mail]
2020-01-06T01:41:41.364303+00:00 app[api]: Release v3 created by user [e-mail]
2020-01-06T01:41:44.417197+00:00 heroku[web.1]: Starting process with command `python app.py`
2020-01-06T01:41:47.570985+00:00 app[web.1]:  * Serving Flask app "app" (lazy loading)
2020-01-06T01:41:47.571007+00:00 app[web.1]:  * Environment: production
2020-01-06T01:41:47.571108+00:00 app[web.1]:    WARNING: Do not use the development server in a production environment.
2020-01-06T01:41:47.571533+00:00 app[web.1]:    Use a production WSGI server instead.
2020-01-06T01:41:47.571654+00:00 app[web.1]:  * Debug mode: off
2020-01-06T01:41:47.573094+00:00 app[web.1]:  * Running on http://127.0.0.1:8000/ (Press CTRL+C to quit)
2020-01-06T01:41:47.000000+00:00 app[api]: Build succeeded
2020-01-06T01:42:44.577123+00:00 heroku[web.1]: State changed from starting to crashed
2020-01-06T01:42:44.580532+00:00 heroku[web.1]: State changed from crashed to starting
2020-01-06T01:42:44.438808+00:00 heroku[web.1]: Error R10 (Boot timeout) -> Web process failed to bind to $PORT within 60 seconds of launch
2020-01-06T01:42:44.438914+00:00 heroku[web.1]: Stopping process with SIGKILL
2020-01-06T01:42:44.558228+00:00 heroku[web.1]: Process exited with status 137
2020-01-06T01:42:46.615852+00:00 heroku[web.1]: Starting process with command `python app.py`
2020-01-06T01:42:49.057720+00:00 app[web.1]:  * Serving Flask app "app" (lazy loading)
2020-01-06T01:42:49.057758+00:00 app[web.1]:  * Environment: production
2020-01-06T01:42:49.057829+00:00 app[web.1]:    WARNING: Do not use the development server in a production environment.
2020-01-06T01:42:49.057893+00:00 app[web.1]:    Use a production WSGI server instead.
2020-01-06T01:42:49.057948+00:00 app[web.1]:  * Debug mode: off
2020-01-06T01:42:49.058690+00:00 app[web.1]:  * Running on http://127.0.0.1:8000/ (Press CTRL+C to quit)
2020-01-06T01:43:47.103192+00:00 heroku[web.1]: State changed from starting to crashed
2020-01-06T01:43:46.992373+00:00 heroku[web.1]: Error R10 (Boot timeout) -> Web process failed to bind to $PORT within 60 seconds of launch
2020-01-06T01:43:46.992475+00:00 heroku[web.1]: Stopping process with SIGKILL
2020-01-06T01:43:47.082857+00:00 heroku[web.1]: Process exited with status 137
2020-01-06T01:46:52.709890+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=POST path="/callback" host=hogehoge.herokuapp.com request_id=5bfd1fd0-6881-40d0-9bf7-cb7a319c6cb7 fwd="203.104.156.76" dyno= connect= service= status=503 bytes= protocol=https

Answer 1

ポート番号を固定じゃないように変更したら、このエラーは回避できました。