esp32 read String or array method in arduino ied compilation environment serial port

The serial port data can be taken as String or array. This is convenient for taking notes by yourself, for reference only

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1. Here is the serial2 serial port using esp32.

1.1. Use String.substring to intercept some data you want.

2. Convert String to int

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2. Quickly build the Esp32 development environment (vscode+PlatformIO IED)

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