回答編集履歴
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追記
test
CHANGED
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@@ -39,3 +39,69 @@
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ライブラリは1.0.6です (あぁ、[issue](https://teratail.com/questions/326026)まだやってなかった)
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---
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あ、もしかして...
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上記はSerial2は無入力で試したのですが、
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HardwareSerialはStreamを継承していて、
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```Arduino
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String Stream::readStringUntil(char terminator)
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{
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String ret;
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int c = timedRead();
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while(c >= 0 && c != terminator) {
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ret += (char) c;
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c = timedRead();
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}
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return ret;
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}
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```
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```Arduino
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int Stream::timedRead()
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{
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int c;
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_startMillis = millis();
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do {
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c = read();
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if(c >= 0) {
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return c;
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}
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} while(millis() - _startMillis < _timeout);
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return -1; // -1 indicates timeout
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}
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```
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だから、データが流れ込んでいる限りreadStringUntil()はタイムアウトしないのでは?
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