配信の基本情報の取得
送信：
{"type":"startWatching","data":{"stream":{"quality":"high","protocol":"hls","latency":"low","chasePlay":false},"room":{"protocol":"webSocket","commentable":true},"reconnect":false}}
受信：
{"type":"statistics","data":{"viewers":4,"comments":0,"adPoints":0,"giftPoints":0}}
受信：
{"type":"serverTime","data":{"currentMs":"2020-06-07T13:19:06.490+09:00"}}
受信：
{"type":"seat","data":{"keepIntervalSec":30}}
受信：
{"type":"stream","data":{"uri":"https://pb085cb3ae2.dmc.nico/hlslive/ht2_nicolive/nicolive-production-pg19685499208275_8aa593e9700cdb282a84e5c30be54256dda87899bad3cfdf21fed004fa330ca5/master.m3u8?ht2_nicolive=59780225.00c1tce1bf_qbjfzu_3ez3lqoegg2hv","syncUri":"https://pb085cb3ae2.dmc.nico/hlslive/ht2_nicolive/nicolive-production-pg19685499208275_8aa593e9700cdb282a84e5c30be54256dda87899bad3cfdf21fed004fa330ca5/stream_sync.json?ht2_nicolive=59780225.00c1tce1bf_qbjfzu_3ez3lqoegg2hv","quality":"normal","availableQualities":["abr","normal","low","super_low","audio_high"],"protocol":"hls"}}
受信：
{"type":"room","data":{"name":"co4877098","messageServer":{"uri":"wss://msg.live2.nicovideo.jp/u10499/websocket","type":"niwavided"},"threadId":"1670624700","isFirst":true,"waybackkey":"1591503546.2VpdNn3lV1CQU8EtMN_F37P5RvU"}}
受信：
{"type":"statistics","data":{"viewers":4,"comments":0,"adPoints":0,"giftPoints":0}}
受信：
{"type":"schedule","data":{"begin":"2020-06-07T13:17:54+09:00","end":"2020-06-07T13:47:54+09:00"}}
生放送でのインタラクション用のAPI？
送信：
{"type":"getAkashic","data":{"chasePlay":false}}
ハートビート 30秒ごとに送信する
送信：
{"type":"keepSeat"}
秒数は 最初の情報受信時にある {"type":"seat","data":{"keepIntervalSec":30}} で指定されてる
画質や低遅延モードの変更
送信：
{"type":"changeStream","data":{"quality":"normal","protocol":"hls","latency":"high","chasePlay":false}}
受信：
{"type":"stream","data":{"uri":"https://pb085cb3ae2.dmc.nico/hlslive/ht2_nicolive/nicolive-production-pg19685499208275_241dd1afd00eae7ffbf2280d4929d2411bfb5e5c4f245ee175ca2b9be291f6bd/master.m3u8?ht2_nicolive=59780225.ch12sodnar_qbjgvh_ill5m3gwkyen","syncUri":"https://pb085cb3ae2.dmc.nico/hlslive/ht2_nicolive/nicolive-production-pg19685499208275_241dd1afd00eae7ffbf2280d4929d2411bfb5e5c4f245ee175ca2b9be291f6bd/stream_sync.json?ht2_nicolive=59780225.ch12sodnar_qbjgvh_ill5m3gwkyen","quality":"normal","availableQualities":["abr","normal","low","super_low","audio_high"],"protocol":"hls"}}
放送終了時
接続が切れた際に画質変更の再試行を試す
送信：
{"type":"changeStream","data":{"quality":"normal","protocol":"hls","latency":"high","chasePlay":false}}
受信：
{"type":"disconnect","data":{"reason":"END_PROGRAM"}}
ポストキーの取得
送信：
{"type":"getPostkey"}
受信：
{"type":"postkey","data":{"value":".1591506456.AB0Czxo7gbKuULO7c7vkNj2edGo","expireAt":"2070-11-12T19:14:42+09:00"}}