Streaming camera for Hamster - Using Raspberry Pi and PHP’s Swoole -

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Streaming camera for Hamster - Using Raspberry Pi and PHP’s Swoole - 04/24/2019 PHP study meetup at Tokyo In Japan memory (@m3m0r7)

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Who am I?

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memory (@m3m0r7) I’m a server-side and front-end engineer. I like PHP and React.js. And I’m working at an IT company in Japan.

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What am I making recently?

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https://github.com/php-java/php-java

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Hamster is…

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Lily Sex: female Birthday: 11/01/2018 Likes: biscuits and apple-tree branches Dislikes: pear-tree branches Hobby: biting at a waterer

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Have you ever used Swoole?

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And have you ever used Raspberry Pi?

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Camera for daytime Camera for nighttime

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These cameras are installed in my home.

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It is Lily’s rack.

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In the red frame is a Raspberry Pi

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Technologies

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- Raspbian (Raspberry Pi) - PHP 7.3 - Swoole v4 - Python 3 - React.js (+ Gulp) Mainly ﬁve technologies

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How much are they?

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- Raspberry Pi 3 Model B * 2 ≒ 5,200 * 2 ≒ 10,000 JPY - Camera modules * 2 ≒ 5,000 * 2 ≒ 10,000 JPY - VPS (ConoHa[1]) ≒ 2,500/mo JPY - Router ≒ 15,000 JPY Initial costs ≒ 37,500 JPY Running costs ≒ 2,500 JPY [1] ConoHa is a VPS service provided by GMO (Japanese IT company).

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A little expensive here.

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How about a latency?

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No more than 0.5 sec.

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The server’s architecture is…

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My Home LAN VPS (ConoHa) PiCamera Module Four-byte size data in unsigned long + picamera.start_recording (mjpeg) Sends image data from daytime camera through TCP connections Sends Image data from night camera through TCP connections

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What is happening in My Home LAN side?

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- I didn’t want to expose any ports from my home - Intermediate server deﬁnitely solved this! I chose ConoHa this time. - Bought a router brand new, which is super cool :) - Sending to VPS (ConoHa) using picamera on Python 3

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Built with high speed and stability. Supported A Wi-Fi Router Equipped with MU-MIMO Technologies High speed connections for multiple devices. Concentrated connections to destination devices by “AiRader” Technology. This Wi-Fi router is capable of delivering electromagnetic wave to the entire home because its covering area is very large.

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What is happening in the VPS side?

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- By using Coroutines on PHP's Swoole, I made an inbound server for Raspberry Pi, and an outbound server for sending to ConoHa - That’s it! Simple is best.

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* Some part of codes

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Production screen is…

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Test for streaming plays

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How did I do this?

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Wave hands beneath the cameras.

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- mjpeg stands for Motion JPEG. - I have also investigated H.264 but its latency increases by 5 sec via ffmpeg. Thus, I chose mjpeg. - Keeps connected in MIME type multipart/x-mixed-replace. - (The browser continuously indicates the page is being loaded) - Latency appears to be roughly 0.5 sec - Renders smoothly.

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My impressions for Swoole

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- Amazing async processing in PHP! - Relatively easy to install because of unnecessity of --enable-maintainer- zts when building. - I pray to Swoole so Atomic can accept at least serializable values. - I’m using Channel instead of Atomic.